Ryousuke SHIMIZU
| Department of Engineering Science | Professor |
| Cluster III (Fundamental Science and Engineering) | Professor |
| Institute for Advanced Science | Professor |
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Paper
- Single-photon-level femtosecond time-resolved measurement by asynchronous optical sampling with dual-wavelength comb
Hajime Komori; Prasad Koviri; Masahiro Ishizeki; Haochen Tian; Thomas R. Schibli; Takashi Kato; Akifumi Asahara; Ryosuke Shimizu; Kaoru Minoshima
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXIV, SPIE, 12 Mar. 2024
International conference proceedings - Pathway selectivity in time-resolved spectroscopy using two-photon coincidence counting with quantum entangled photons
Yuta Fujihashi; Akihito Ishizaki; Ryosuke Shimizu
Last, The Journal of Chemical Physics, AIP Publishing, 160, 10, 08 Mar. 2024, Peer-reviwed, Ultrafast optical spectroscopy is a powerful technique for studying the dynamic processes of molecular systems in condensed phases. However, in molecular systems containing many dye molecules, the spectra can become crowded and difficult to interpret owing to the presence of multiple nonlinear optical contributions. In this work, we theoretically propose time-resolved spectroscopy based on the coincidence counting of two entangled photons generated via parametric down-conversion with a monochromatic laser. We demonstrate that the use of two-photon counting detection of entangled photon pairs enables the selective elimination of the excited-state absorption signal. This selective elimination cannot be realized with classical coherent light. We anticipate that the proposed spectroscopy will help simplify the spectral interpretation of complex molecular and material systems comprising multiple molecules.
Scientific journal, English - Ultrafast time-resolved single-photon detection using two-color comb based asynchronous optical sampling for quantum applications
Prasad Koviri; Hajime Komori; Masahiro Ishizeki; Haochen Tian; Takashi Kato; Akifumi Asahara; Ryosuke Shimizu; Thomas R. Schibli; Kaoru Minoshima
Quantum Sensing and Nano Electronics and Photonics XX, SPIE, 08 Mar. 2024
International conference proceedings - Single-photon level ultrafast time-resolved measurement using two-color dual-comb-based asynchronous linear optical sampling
Prasad Koviri; Hajime Komori; Haochen Tian; Masahiro Ishizeki; Takashi Kato; Akifumi Asahara; Ryosuke Shimizu; Thomas R. Schibli; Kaoru Minoshima
Applied Physics Express, IOP Publishing, 17, 2, 022001-022001, 01 Feb. 2024, Abstract
We demonstrated an ultrafast time-resolved measurement method operating at the single-photon level and employing a two-color comb-based asynchronous optical sampling (ASOPS) setup. We harnessed the two-color ASOPS photon counting approach to achieve long-term averaging of the ultralow intensity signal with a synchronized optical trigger signal, which minimizes residual timing jitter between the two combs. A pulse-width limited picosecond cross-correlation signal was successfully obtained with a power level of <1 photon/pulse. This approach enables the thorough study of ultrafast time-resolved detection of entangled photon pairs, quantum mechanical correlations in the time-frequency domain and finds wide use in optical quantum technology.
Scientific journal - Comparison of multi-mode Hong-Ou-Mandel interference and multi-slit interference
Yan Guo; Zi-Xiang Yang; Zi-Qi Zeng; Chunling Ding; Ryosuke Shimizu; Rui-Bo Jin
Optics Express, Optica Publishing Group, 31, 20, 32849-32849, 18 Sep. 2023, Peer-reviwed, Hong-Ou-Mandel (HOM) interference of multi-mode frequency entangled states plays a crucial role in quantum metrology. However, as the number of modes increases, the HOM interference pattern becomes increasingly complex, making it challenging to comprehend intuitively. To overcome this problem, we present the theory and simulation of multi-mode-HOM interference (MM-HOMI) and compare it to multi-slit interference (MSI). We find that these two interferences have a strong mapping relationship and are determined by two factors: the envelope factor and the details factor. The envelope factor is contributed by the single-mode HOM interference (single-slit diffraction) for MM-HOMI (MSI). The details factor is given by sin (Nx)/sin (x) ([sin (Nv)/sin (v)]2) for MM-HOMI (MSI), where N is the mode (slit) number and x (v) is the phase spacing of two adjacent spectral modes (slits). As a potential application, we demonstrate that the square root of the maximal Fisher information in MM-HOMI increases linearly with the number of modes, indicating that MM-HOMI is a powerful tool for enhancing precision in time estimation. We also discuss multi-mode Mach-Zehnder interference, multi-mode NOON-state interference, and the extended Wiener-Khinchin theorem. This work may provide an intuitive understanding of MM-HOMI patterns and promote the application of MM-HOMI in quantum metrology.
Scientific journal, English - Spatial-spectral mapping to prepare frequency entangled qudits
Zi-Xiang Yang; Zi-Qi Zeng; Ying Tian; Shun Wang; Ryosuke Shimizu; Hao-Yu Wu; Shilong Liu; Rui-Bo Jin
Optics Letters, Optica Publishing Group, 48, 9, 2361-2364, 25 Apr. 2023, Peer-reviwed
Scientific journal, English - Polar-Coded Transmission over 7.8-km Terrestrial Free-Space Optical Links
Shingo Fujita; Eiji Okamoto; Hideki Takenaka; Hiroyuki Endo; Mikio Fujiwara; Mitsuo Kitamura; Ryosuke Shimizu; Masahide Sasaki; Morio Toyoshima
Photonics, MDPI AG, 10, 4, 462-462, 17 Apr. 2023, Peer-reviwed, Free-space optical (FSO) communications can offer high-capacity transmission owing to the properties of the laser beams. However, performance degradation caused by atmospheric turbulence is an urgent issue. Recently, the application of polar codes, which can provide capacity-achieving error-correcting performance with low computational cost for decoding, to FSO communications has been studied. However, long-distance and real-field experiments have not been conducted in these studies. To the best of our knowledge, this study is the first to present the experimental results of polar-coded transmission over 7.8-km FSO links. Using experimental data, we investigated the performance of polar codes over atmospheric channels, including their superiority to regular low-density parity-check codes. We expect that our results will offer a path toward the application of polar codes in high-speed optical communication networks including satellites.
Scientific journal, English - Short interference fringe and high event rate of two-photon interference using up-converted photon pairs
Atsushi Syouji, Ryosuke Shimizu, Shigehiro Nagano, Koji Suizu, and Keiichi Edamatsu
Japanese Journal of Applied Physics, IOP Publishing Ltd, 63, 2, 022003/1-4, 16 Feb. 2023, Peer-reviwed, False, We demonstrate a hybrid approach to detecting a short fringe period of two-photon interference with high brightness, by combining spontaneous parametric down-conversion (SPDC) and up-conversion techniques. Photon pairs were generated at the wavelength of 1550 nm via SPDC, and converted to 516.7 nm through up-conversion process with the pump light 775 nm in efficiency similar to 90%. The two-photon interference of the up-converted photon pairs exhibited a fringe period of 258.3 nm with high event rate (similar to 2000 counts s(-1)), which was 6 times shorter than the original wavelength, demonstrating that the energy-time correlation of the photon pairs was preserved. The technique simultaneously provides short fringe period beyond the classical limit and high brightness of the photon pairs.
Scientific journal, English - Quantum interferometric spectroscopy of a biexciton
Hiroya Seki, Kensuke Miyajima, and Ryosuke Shimizu
Physical Review A, American Physical Society, 106, 063716/1-7, 22 Dec. 2022, Peer-reviwed, False
Scientific journal, English - Two-photon spectral modulation via temporal manipulation: Quantum optical synthesis of spectral modes from temporal square waves
Rui-Bo Jin, Hiroki Oshima, Takumi Yagisawa, Masahiro Yabuno, Shigehito Miki, Fumihiro China, Hirotaka Terai, Ryosuke Shimizu
Applied Physics Letters, AIP Publishing, 121, 24, 244002/1-8, 13 Dec. 2022, Peer-reviwed, True
Scientific journal, English - Ultrafast measurement of a single-photon wave packet using an optical Kerr gate
Masahiro Yabuno; Takahiro Takumi; Fumihiro China; Shigehito Miki; Hirotaka Terai; Peter J. Mosley; Rui-Bo Jin; Ryosuke Shimizu
Optics Express, OPTICAL SOC AMER, 30, 4, 4999-5007, 02 Feb. 2022, Peer-reviwed, Ultrafast quantum optics with time-frequency entangled photons is at the forefront of progress towards future quantum technologies. However, to unravel the time domain structure of entangled photons and exploit fully their rich dimensionality, a single-photon detector with sub-picosecond temporal resolution is required. Here, we present ultrafast single-photon detection using an optical Kerr gate composed of a photonic crystal fiber (PCF) placed inside a Sagnac interferometer. A near-rectangle temporal waveform of a heralded single-photon generated via spontaneous parametric down-conversion is measured with temporal resolution as high as 224 +/- 9 fs. The large nonlinearity and long effective interaction length of the PCF enables maximum detection efficiency to be achieved with only 30.5 mW gating pulse average power, demonstrating an order-of-magnitude improvement compared to optical gating with sum-frequency generation. Also, we discuss the trade-off relationship between detection efficiency and temporal resolution. Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License.
Scientific journal, English - Broadband-laser-diode pumped PPKTP-Sagnac polarization-entangled photon source
Neng Cai; Wu-Hao Cai; Shun Wang; Fang Li; Ryosuke Shimizu; Rui-Bo Jin
Journal of the Optical Society of America B, 39, 1, 77-82, 08 Dec. 2021, Peer-reviwed
Scientific journal, English - Quantum optical synthesis in 2D time-frequency space
Rui-Bo Jin; Kurumi Tazawa; Naoto Asamura; Masahiro Yabuno; Shigehito Miki; Fumihiro China; Hirotaka Terai; Kaoru Minoshima; Ryosuke Shimizu
APL Photonics, AIP Publishing, 6, 8, 086104/1-7, 02 Aug. 2021, Peer-reviwed
Scientific journal, English - Detection of Time-Frequency Entangled Photons in 2D space and Demonstration of its Duality Relation
Ryosuke SHIMIZU
The Review of Laser Engineering, レーザー学会, 49, 4, 206-211, 20 Apr. 2021, Peer-reviwed, Invited
Scientific journal, Japanese - Mid-infrared spectrally-uncorrelated biphotons generation from doped PPLN: a theoretical investigation.
Bei Wei; Wu-Hao Cai; Chunling Ding; Guang-Wei Deng; Ryosuke Shimizu; Qiang Zhou; Rui-Bo Jin
Opt. Express, 29, 1, 256-271, 22 Dec. 2020, Peer-reviwed
Scientific journal, English - Generation of pseudo-sunlight via quantum entangled photons and the interaction with molecules
Yuta Fujihashi; Ryosuke Shimizu; Akihito Ishizaki
Phys. Rev. Research, AMER PHYSICAL SOC, 2, 2, 023256/1-7, 01 Jun. 2020, Peer-reviwed, Light incident upon molecules triggers fundamental processes in diverse systems present in nature. However, under natural conditions such as sunlight illumination, it is impossible to assign known times for photon arrival due to continuous pumping, and therefore the photo-induced processes cannot be easily investigated. In this work, we demonstrate theoretically that the characteristics of sunlight photons, such as photon number statistics and spectral distribution, can be emulated through a quantum entangled photon pair generated with parametric down-conversion (PDC). We show that the average photon number of sunlight in a specific frequency spectrum, e.g., the visible light, can be reconstructed by adjusting the PDC crystal length and pump frequency, and thereby the molecular dynamics induced by the pseudo-sunlight can be investigated. The entanglement time, which is the hallmark of quantum entangled photons, can serve as a control knob to resolve the photon arrival times, enabling investigations on real-time dynamics triggered by pseudo-sunlight photons.
Scientific journal, English - Spectrally uncorrelated biphotons generated from"the family of BBO crystal"
Rui-Bo Jin; Wu-Hao Cai; Chunling Ding; Feng Mei; Guang-Wei Deng; Ryosuke Shimizu; Qiang Zhou
Quantum Engineering, 2, 2, e38/1-15, 16 May 2020, Peer-reviwed
Scientific journal, English - Theoretical investigation of a spectrally pure-state generation from isomorphs of KDP crystal at near-infrared and telecom wavelengths.
Rui-Bo Jin; Neng Cai; Ying Huang; Xiang-Ying Hao; Shun Wang; Fang Li; Hai-Zhi Song; Qiang Zhou; Ryosuke Shimizu
Phys. Rev. Appl., 11, 034067/1-9, 28 Mar. 2019, Peer-reviwed
Scientific journal, English - Time-frequency duality of biphotons for quantum optical synthesis
Rui-bo Jin; Takuma Saito; Ryosuke Shimizu
Phys. Rev. Appl., 10, 034011/1-11, 07 Sep. 2018, Peer-reviwed
Scientific journal, English - Free space optical secret key agreement
Hiroyuki Endo; Mikio Fujiwara; Mitsuo Kitamura; Orie Tsuzuki; Toshiyuki Ito; Ryosuke Shimizu; Masahiro Takeoka; Masahide Sasaki
Opt. Express, 26, 18, 23305-23332, 27 Aug. 2018, Peer-reviwed
Scientific journal, English - Quantum manipulation of biphoton spectral distributions in a 2D frequency space toward arbitrary shaping of a biphoton wave packet
Rui-bo Jin; Ryoji Shiina; Ryosuke Shimizu
Opt. Express, 26, 16, 21153-21158, 01 Aug. 2018, Peer-reviwed
Scientific journal, English - Free-space optical wiretap channel and experimental secret key agreement in 7.8 km terrestrial link
Mikio Fujiwara; Toshiyuki Ito; Mitsuo Kitamura; Hiroyuki Endo; Orie Tsuzuki; Morio Toyoshima; Hideki Takenaka; Yoshihisa Takayama; Ryosuke Shimizu; Masahiro Takeoka; Ryutaroh Matsumoto; Masahide Sasaki
Opt. Express, 26, 15, 19513-19523, 18 Jul. 2018, Peer-reviwed
Scientific journal, English - Extended Wiener–Khinchin theorem for quantum spectral analysis
Rui-Bo Jin; Ryosuke Shimizu
Optica, OSA - The Optical Society, 5, 2, 93-98, 20 Feb. 2018, Peer-reviwed, The classical Wiener–Khinchin theorem (WKT), which can extract spectral information by classical interferometers through Fourier transform, is a fundamental theorem used in many disciplines. However, there is still a need for a quantum version of WKT, which could connect correlated biphoton spectral information by quantum interferometers. Here, we extend the classical WKT to its quantum counterpart [i.e., extended WKT (e-WKT)], which is based on two-photon quantum interferometry. According to the e-WKT, the difference–frequency distribution of the biphoton wavefunctions can be extracted by applying a Fourier transform on the time-domain Hong–Ou–Mandel interference (HOMI) patterns, while the sum-frequency distribution can be extracted by applying a Fourier transform on the time-domain NOON state interference (NOONI) patterns. We also experimentally verified the WKT and e-WKT in a Mach–Zehnder interference (MZI), a HOMI, and a NOONI. This theorem can be directly applied to quantum spectroscopy, where the spectral correlation information of biphotons can be obtained from time-domain quantum interferences by Fourier transform. This may open a new path for the study of light–matter interaction at the single photon level.
Scientific journal, English - Coupling efficiency of laser beam to multimode fiber for free space optical communication
Suguru Arisa; Yoshihisa Takayama; Hiroyuki Endo; Ryosuke Shimizu; Mikio Fujiwara; Masahide Sasaki
Proceedings of SPIE - The International Society for Optical Engineering, 10563, 14 Nov. 2017, © 2018 SPIE. Recently, the free space optical (FSO) communications have been widely studied as an alternative for large capacity communications and its possible implementation in satellite and terrestrial laser links. In satellite communications, clouds can strongly attenuate the laser signal that would lead to high bit-error rates or temporal unavailability of the link. To overcome the cloud coverage effects, often site diversity technique is implemented. When using multiple ground stations though, simplified optical system is required to allow the usage of more flexible approaches. In terrestrial laser communications, several methods for optical system simplification by using a multimode fiber (MMF) have been proposed. - Quantum photonic network and physical layer security.
Masahide Sasaki; Hiroyuki Endo; Mikio Fujiwara; Mitsuo Kitamura; Toshiyuki Ito; Ryosuke Shimizu; Morio Toyoshima
Philos, Trans. R. Soc. A-Math. Phys. Eng. Sci., 375, 2099, 20160243/1-20160243/10, 26 Jun. 2017, Peer-reviwed
Scientific journal, English - Monotonic quantum-to-classical transition enabled by positively correlated biphotons
Rui-Bo Jin; Guo-Qun Chen; Hui Jing; Changliang Ren; Pei Zhao; Ryosuke Shimizu; Pei-Xiang Lu
PHYSICAL REVIEW A, AMER PHYSICAL SOC, 95, 6, 062341/1-8, Jun. 2017, Peer-reviwed, Multiparticle interference is a fundamental phenomenon in the study of quantum mechanics. It was discovered in a recent experiment [Y.-S. Ra et al., Proc. Natl. Acad. Sci. USA 110, 1227 (2013)] that spectrally uncorrelated biphotons exhibited a nonmonotonic quantum-to-classical transition in a four-photon Hong-Ou-Mandel (HOM) interference. In this work, we consider the same scheme with spectrally correlated photons. By theoretical calculation and numerical simulation, we found the transition not only can be nonmonotonic with negatively correlated or uncorrelated biphotons, but also can be monotonic with positively correlated biphotons. The fundamental reason for this difference is that the HOM-type multiphoton interference is a differential-frequency interference. Our study may shed new light on understanding the role of frequency entanglement in multiphoton behavior.
Scientific journal, English - Detection-dependent six-photon Holland-Burnett state interference
Rui-Bo Jin; Mikio Fujiwara; Ryosuke Shimizu; Robert J. Collins; Gerald S. Buller; Taro Yamashita; Shigehito Miki; Hirotaka Terai; Masahiro Takeoka; Masahide Sasaki
SCIENTIFIC REPORTS, NATURE PUBLISHING GROUP, 6, 36914/1-7, Nov. 2016, Peer-reviwed, The NOON state, and its experimental approximation the Holland-Burnett state, have important applications in phase sensing measurement with enhanced sensitivity. However, most of the previous Holland-Burnett state interference (HBSI) experiments only investigated the area of the interference pattern in the region immediately around zero optical path length difference, while the full HBSI pattern over a wide range of optical path length differences has not yet been well explored. In this work, we experimentally and theoretically demonstrate up to six-photon HBSI and study the properties of the interference patterns over a wide range of optical path length differences. It was found that the shape, the coherence time and the visibility of the interference patterns were strongly dependent on the detection schemes. This work paves the way for applications which are based on the envelope of the HBSI pattern, such as quantum spectroscopy and quantum metrology.
Scientific journal, English - 光空間通信における物理レイヤ暗号 実環境における性能推定と符号化
遠藤寛之; 藤原幹生; 北村光雄; 伊藤寿之; 豊嶋守生; 竹中秀樹; 清水亮介; 青木隆朗; 佐々木雅英
IEICE Technical Report, 電子情報通信学会, 116, 183, 7-12, 18 Aug. 2016, Invited
Scientific journal, Japanese - Simple method of generating and distributing frequency-entangled qudits
Rui-Bo Jin; Ryosuke Shimizu; Mikio Fujiwara; Masahiro Takeoka; Ryota Wakabayashi; Taro Yamashita; Shigehito Miki; Hirotaka Terai; Thomas Gerrits; Masahide Sasaki
Quantum Science and Technology, Institute of Physics Publishing, 1, 1, 015004/1-9, 01 Aug. 2016, Peer-reviwed, High-dimensional, frequency-entangled photonic quantum bits (qudits for d-dimension) are promising resources for quantum information processing in an optical fiber network and can also be used to improve channel capacity and security for quantum communication. However, up to now, it is still challenging to prepare high-dimensional frequency-entangled qudits in experiments, due to technical limitations. Here we propose and experimentally implement a novel method for a simple generation of frequency-entangled qudtswith d >
10 without the use of any spectral filters or cavities. The generated state is distributed over 15 kmin total length. This scheme combines the technique of spectral engineering of biphotons generated by spontaneous parametric down-conversion and the technique of spectrally resolved Hong-Ou-Mandel interference. Our frequency-entangled qudits will enable quantum cryptographic experiments with enhanced performances. This distribution of distinct entangled frequency modes may also be useful for improved metrology, quantum remote synchronization, as well as for fundamental test of stronger violation of local realism.
Scientific journal, English - Free-space optical channel estimation for physical layer security
Hiroyuki Endo; Mikio Fujiwara; Mitsuo Kitamura; Toshiyuki Ito; Morio Toyoshima; Yoshihisa Takayama; Hideki Takenaka; Ryosuke Shimizu; Nicola Laurenti; Giuseppe Vallone; Paolo Villoresi; Takao Aoki; Masahide Sasaki
OPTICS EXPRESS, OPTICAL SOC AMER, 24, 8, 8940-8955, Apr. 2016, Peer-reviwed, We present experimental data on message transmission in a free-space optical (FSO) link at an eye-safe wavelength, using a testbed consisting of one sender and two receiver terminals, where the latter two are a legitimate receiver and an eavesdropper. The testbed allows us to emulate a typical scenario of physical-layer (PHY) security such as satellite-to-ground laser communications. We estimate information-theoretic metrics including secrecy rate, secrecy outage probability, and expected code lengths for given secrecy criteria based on observed channel statistics. We then discuss operation principles of secure message transmission under realistic fading conditions, and provide a guideline on a multi-layer security architecture by combining PHY security and upper-layer (algorithmic) security. (C) 2016 Optical Society of America
Scientific journal, English - 光空間通信の物理レイヤセキュリティ技術
遠藤寛之; 藤原幹生; 北村光雄; 伊藤寿之; 豊嶋守生; 竹中秀樹; 清水亮介; 青木隆朗; 佐々木雅英
IEICE Technical Report, 電子情報通信学会, 115, 448, 11-15, Feb. 2016
Scientific journal, Japanese - Spectrally resolved Hong-Ou-Mandel interference between independent photon sources
Rui-Bo Jin; Thomas Gerrits; Mikio Fujiwara; Ryota Wakabayashi; Taro Yamashita; Shigehito Miki; Hirotaka Terai; Ryosuke Shimizu; Masahiro Takeoka; Masahide Sasaki
OPTICS EXPRESS, OPTICAL SOC AMER, 23, 22, 28829-28835, Nov. 2015, Peer-reviwed, Hong-Ou-Mandel (HOM) interference between independent photon sources (HOMI-IPS) is the fundamental block for quantum information processing. All the previous HOMI-IPS experiments were carried out in time-domain, however, the spectral information during the interference was omitted. Here, we investigate the HOMI-IPS in spectral domain using the recently developed fast fiber spectrometer, and demonstrate the spectral distribution during the HOM interference between two heralded single-photon sources, and two thermal sources. This experiment not only can deepen our understanding of HOMI-IPS from the viewpoint of spectral domain, but also presents a tool to test the theoretical predictions of HOMI-IPS using spectrally engineered sources. (C) 2015 Optical Society of America
Scientific journal, English - Spectral properties of broadband biphotons generated from PPMgSLT under a type-II phase-matching condition
Nandan S. Bisht; Ryosuke Shimizu
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, OPTICAL SOC AMER, 32, 4, 550-554, Apr. 2015, Peer-reviwed, We report the spectral properties of broadband biphotons generated by pulsed type-II spontaneous parametric down-conversion based on a periodically poled MgO-doped stoichiometric LiTaO3 (PPMgSLT). Spectroscopic and interferometric measurements were used to characterize the biphoton source. For the spectroscopic measurements, we used conventional spectroscopy and joint spectral intensity measurements. For the interferometric measurements, sum-and difference-frequency two-photon interference experiments were performed to estimate the spectral correlation and to ensure the broadband nature of biphotons, respectively. When using a picosecond Ti: sapphire as a pump source, the spectral width of biphotons was over 40 nm. Finally, we demonstrated the relationship between the two-photon interference visibility and the symmetricity of the joint spectral distribution. (C) 2015 Optical Society of America
Scientific journal, English - Highly efficient entanglement swapping and teleportation at telecom wavelength
Rui-Bo Jin; Masahiro Takeoka; Utako Takagi; Ryosuke Shimizu; Masahide Sasaki
SCIENTIFIC REPORTS, NATURE PUBLISHING GROUP, 5, 93333/1-7, Mar. 2015, Peer-reviwed, Entanglement swapping at telecom wavelengths is at the heart of quantum networking in optical fiber infrastructures. Although entanglement swapping has been demonstrated experimentally so far using various types of entangled photon sources both in near-infrared and telecom wavelength regions, the rate of swapping operation has been too low to be applied to practical quantum protocols, due to limited efficiency of entangled photon sources and photon detectors. Here we demonstrate drastic improvement of the efficiency at telecom wavelength by using two ultra-bright entangled photon sources and four highly efficient superconducting nanowire single photon detectors. We have attained a four-fold coincidence count rate of 108 counts per second, which is three orders higher than the previous experiments at telecom wavelengths. A raw (net) visibility in a Hong-Ou-Mandel interference between the two independent entangled sources was 73.3 +/- 1.0% (85.1 +/- 0.8%). We performed the teleportation and entanglement swapping, and obtained a fidelity of 76.3% in the swapping test. Our results on the coincidence count rates are comparable with the ones ever recorded in teleportation/swapping and multi-photon entanglement generation experiments at around 800 nm wavelengths. Our setup opens the way to practical implementation of device-independent quantum key distribution and its distance extension by the entanglement swapping as well as multi-photon entangled state generation in telecom band infrastructures with both space and fiber links.
Scientific journal, English - Efficient detection of an ultra-bright single-photon source using superconducting nanowire single-photon detectors
Rui-Bo Jin; Mikio Fujiwara; Taro Yamashita; Shigehito Miki; Hirotaka Terai; Zhen Wang; Kentaro Wakui; Ryosuke Shimizu; Masahide Sasaki
OPTICS COMMUNICATIONS, ELSEVIER SCIENCE BV, 336, 47-54, Feb. 2015, Peer-reviwed, We investigate the detection of a single photon source using highly efficient superconducting nanowire single photon detectors (SNSPDs) at telecom wavelengths. Both the single photon source and the detectors are characterized in detail. At a pump power of 100 mW (400 mW), the measured coincidence counts can achieve 400 kcps (147 Mcps), which is the highest. ever reported at telecom wavelengths to the best of our knowledge. The multi-pair contributions, the experimental and theoretical second order coherence functions, and the saturation properly of SNSPD are analyzed in detail. The experimental data and theoretical analysis should be useful for ate future experiments to detect ultra-bright down-conversion sources with high-efficiency detectors. (C) 2014 Elsevier By. All rights reserved.
Scientific journal, English - Efficient generation of twin photons at telecom wavelengths with 10 GHz repetition-rate-tunable comb laser
Jin Rui-Bo; Shimizu Ryosuke; Morohashi Isao; Wakui Kentaro; Takeoka Masahiro; Izumi Shuro; Sakamoto Takahide; Fujiwara Mikio; Yamashita Taro; Miki Shigehito; Terai Hirotaka; Wang Zhen; Sasaki Masahide
2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), ., 2015
Scientific journal, English - Efficient generation of twin photons at telecom wavelengths with 2.5 GHz repetition-rate-tunable comb laser
Rui-Bo Jin; Ryosuke Shimizu; Isao Morohashi; Kentaro Wakui; Masahiro Takeoka; Shuro Izumi; Takahide Sakamoto; Mikio Fujiwara; Taro Yamashita; Shigehito Miki; Hirotaka Terai; Zhen Wang; Masahide Sasaki
SCIENTIFIC REPORTS, NATURE PUBLISHING GROUP, 4, 7468/1-6, Dec. 2014, Peer-reviwed, Efficient generation and detection of indistinguishable twin photons are at the core of quantum information and communications technology (Q-ICT). These photons are conventionally generated by spontaneous parametric down conversion (SPDC), which is a probabilistic process, and hence occurs at a limited rate, which restricts wider applications of Q-ICT. To increase the rate, one had to excite SPDC by higher pump power, while it inevitably produced more unwanted multi-photon components, harmfully degrading quantum interference visibility. Here we solve this problem by using recently developed 10 GHz repetition-rate-tunable comb laser, combined with a group-velocity-matched nonlinear crystal, and superconducting nanowire single photon detectors. They operate at telecom wavelengths more efficiently with less noises than conventional schemes, those typically operate at visible and near infrared wavelengths generated by a 76 MHz Ti Sapphire laser and detected by Si detectors. We could show high interference visibilities, which are free from the pump-power induced degradation. Our laser, nonlinear crystal, and detectors constitute a powerful tool box, which will pave a way to implementing quantum photonics circuits with variety of good and low-cost telecom components, and will eventually realize scalable Q-ICT in optical infra-structures.
Scientific journal, English - Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength
Rui-Bo Jin; Ryosuke Shimizu; Kentaro Wakui; Mikio Fujiwara; Taro Yamashita; Shigehito Miki; Hirotaka Terai; Zhen Wang; Masahide Sasaki
OPTICS EXPRESS, OPTICAL SOC AMER, 22, 10, 11498-11507, May 2014, Peer-reviwed, We demonstrate pulsed polarization-entangled photons generated from a periodically poled KTiOPO4 (PPKTP) crystal in a Sagnac interferometer configuration at telecom wavelength. Since the group-velocity-matching (GVM) condition is satisfied, the intrinsic spectral purity of the photons is much higher than in the previous scheme at around 800 nm wavelength. The combination of a Sagnac interferometer and the GVM-PPKTP crystal makes our entangled source compact, stable, highly entangled, spectrally pure and ultra-bright. The photons were detected by two superconducting nanowire single photon detectors (SNSPDs) with detection efficiencies of 70% and 68% at dark counts of less than 1 kcps. We achieved fidelities of 0.981 +/- 0.0002 for vertical bar psi(-)> and 0.980 +/- 0.001 for vertical bar psi(+)> respectively. This GVM-PPKTP-Sagnac scheme is directly applicable to quantum communication experiments at telecom wavelength, especially in free space. (C) 2014 Optical Society of America
Scientific journal, English - Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength
Rui-Bo Jin; Ryosuke Shimizu; Kentaro Wakui; Mikio Fujiwara; Taro Yamashita; Shigehito Miki; Hirotaka Terai; Zhen Wang; Masahide Sasaki
2014 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE, 22, 10, 11498-11507, 2014, Peer-reviwed, We demonstrate pulsed polarization-entangled photons generated from a periodically poled KTiOPo (PPKTP) crystal in a Sagnac interferometer configuration at telecom wavelength. We achieved fidelities of 0.981 +/- 0.0002 for vertical bar psi(-)> and 0.980 +/- 0.001 for vertical bar psi(+)> respectively. (C) 2014 Optical Society of America
International conference proceedings, English - Entangled-state generation with an intrinsically pure single-photon source and a weak coherent source
Rui-Bo Jin; Ryosuke Shimizu; Fumihiro Kaneda; Yasuyoshi Mitsumori; Hideo Kosaka; Keiichi Edamatsu
PHYSICAL REVIEW A, AMER PHYSICAL SOC, 88, 1, 012324/1-4, Jul. 2013, Peer-reviwed, We report on the experimental generation of an entangled state with a spectrally pure heralded single-photon state and a weak coherent state. Our source, which was as efficient as that reported in our previous report [Phys. Rev. A 83, 031805 (2011)], was much brighter than those reported in earlier experiments using similar configurations. This entanglement system is useful for quantum information protocols that require indistinguishable photons from independent sources.
Scientific journal, English - Nonclassical interference between independent intrinsically pure single photons at telecommunication wavelength
Rui-Bo Jin; Kentaro Wakui; Ryosuke Shimizu; Hugo Benichi; Shigehito Miki; Taro Yamashita; Hirotaka Terai; Zhen Wang; Mikio Fujiwara; Masahide Sasaki
Physical Review A - Atomic, Molecular, and Optical Physics, 87, 6, 063801/1-4, 03 Jun. 2013, Peer-reviwed, We demonstrate a Hong-Ou-Mandel interference between two independent, intrinsically pure, heralded single photons from spontaneous parametric down-conversion (SPDC) at telecommunication wavelength. A visibility of 85.5±8.3% was achieved without using any bandpass filter. Thanks to the group-velocity-matched SPDC and superconducting nanowire single-photon detectors (SNSPDs), the fourfold coincidence counts are one order higher than that in the previous experiments. The combination of bright single-photon sources and SNSPDs is a crucial step for future practical quantum infocommunication systems at telecommunication wavelength. © 2013 American Physical Society.
Scientific journal, English - Widely tunable single photon source with high purity at telecom wavelength
Rui-Bo Jin; Ryosuke Shimizu; Kentaro Wakui; Hugo Benichi; Masahide Sasaki
OPTICS EXPRESS, OPTICAL SOC AMER, 21, 9, 10659-10666, May 2013, Peer-reviwed, We theoretically and experimentally investigate the spectral tunability and purity of photon pairs generated from spontaneous parametric down conversion in periodically poled KTiOPO4 crystal with group-velocity matching condition. The numerical simulation predicts that the spectral purity can be kept higher than 0.81 when the wavelength is tuned from 1460 nm to 1675 nm, which covers the S-, C-, L-, and U-band in telecommunication wavelengths. We also experimentally measured the joint spectral intensity at 1565 nm, 1584 nm and 1565 nm, yielding Schmidt numbers of 1.01, 1.02 and 1.04, respectively. Such a photon source is useful for quantum information and communication systems. (c) 2013 Optical Society of America
Scientific journal, English - Widely-tunable, spectrally pure, high efficient photon pairs generation at telecom wavelength
Ruibo Jin; Ryosuke Shimizu; Kentaro Wakui; Hugo Benichi; Masahide Sasaki
2013 CONFERENCE ON AND INTERNATIONAL QUANTUM ELECTRONICS CONFERENCE LASERS AND ELECTRO-OPTICS EUROPE (CLEO EUROPE/IQEC), IEEE, 2013, Peer-reviwed
International conference proceedings, English - Four-photon quantum interferometry at a telecom wavelength
Masahiro Yabuno; Ryosuke Shimizu; Yasuyoshi Mitsumori; Hideo Kosaka; Keiichi Edamatsu
PHYSICAL REVIEW A, AMER PHYSICAL SOC, 86, 1, 010302(R)/1-4, Jul. 2012, Peer-reviwed, We report on an experimental demonstration of four-photon quantum interference using telecom-wavelength photons. The realization of multiphoton quantum interference is essential to linear optics quantum information processing and measurement-based quantum computing. We have developed a source that efficiently emits photon pairs in a pure spectrotemporal mode at a telecom-wavelength region, and have demonstrated quantum interference exhibiting reduced fringe intervals that correspond to a reduced de Broglie wavelength of up to the four-photon NOON state. Our result should open a path to practical quantum information processing using telecom-wavelength photons.
Scientific journal, English - Experimental Activation of Bound Entanglement
Fumihiro Kaneda; Ryosuke Shimizu; Satoshi Ishizaka; Yasuyoshi Mitsumori; Hideo Kosaka; Keiichi Edamatsu
PHYSICAL REVIEW LETTERS, AMER PHYSICAL SOC, 109, 4, 040501/1-4, Jul. 2012, Peer-reviwed, Entanglement is one of the essential resources in quantum information and communication technology (QICT). The entanglement thus far explored and applied to QICT has been pure and distillable entanglement. Yet, there is another type of entanglement, called "bound entanglement,'' which is not distillable by local operations and classical communication. We demonstrate the experimental "activation'' of the bound entanglement held in the four-qubit Smolin state, unleashing its immanent entanglement in distillable form, with the help of auxiliary two-qubit entanglement and local operations and classical communication. We anticipate that it opens the way to a new class of QICT applications that utilize more general classes of entanglement than ever, including bound entanglement.
Scientific journal, English - Entangled photon generation in two-period quasi-phase-matched parametric down-conversion
W.Ueno; F. Kaneda; H.Suzuki; S. Nagano; A. Syouji; R. Shimizu; K. Suizu; K. Edamatsu
Opt. Express, 20, 5, 5508-5517, Mar. 2012, Peer-reviwed
Scientific journal, English - Photon pair sources with controlled frequency correlation
K. Edamatsu; R. Shimizu; W. Ueno; R.-B. Jin; F. Kaneda; M. Yabuno; H. Suzuki; S. Nagano; A. Syouji; K. Suizu
Progress in Informatics, 8, 19-26, Mar. 2011, Peer-reviwed
Scientific journal, English - Generation and Characterization of Bound Entanglement in Optical Qubits
Fumihiro Kaneda; Ryosuke Shimizu; Yasuyoshi Mitsumori; Hideo Kosaka; Keiichi Edamatsu
Progress in Informatics, 8, 27-31, Mar. 2011, Peer-reviwed
Scientific journal, English - High-visibility nonclassical interference between intrinsically pure heralded single photons and photons from a weak coherent field
Rui-Bo Jin; Jun Zhang; Ryosuke Shimizu; Nobuyuki Matsuda; Yasuyoshi Mitsumori; Hideo Kosaka; Keiichi Edamatsu
PHYSICAL REVIEW A, AMER PHYSICAL SOC, 83, 3, 031805(R)/1-4, Mar. 2011, Peer-reviwed, We present an experiment of nonclassical interference between an intrinsically pure heralded single-photon state and a weak coherent state. Our experiment demonstrates that, without the use of bandpass filters, spectrally pure single photons can have high-visibility (89.4 +/- 0.5%) interference with photons from a weak coherent field. Our scheme lays the groundwork for future experiments requiring quantum interference between photons in nonclassical states and those in coherent states.
Scientific journal, English - Generation and superactivation of bound entanglement
Fumihiro Kaneda; Ryosuke Shimizu; Satoshi Ishizaka; Yasuyoshi Mitsumori; Hideo Kosaka; Keiichi Edamatsu
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011, 2011, Peer-reviwed, We report the experimental realization of the four-partite bound-entangled state, i.e., Smolin state [1] and demonstrate the superactivation of the bound entanglement. Bound entanglement is a class of multipartite entanglement that cannot be distilled into pure entanglement under local operations and classical communication (LOCC). Despite its undistillable property, this class of entanglement has interesting properties that are expected to be useful in quantum information processing (QIP). For instance, in the Smolin state, the bound entanglement can be activated into distillable entanglement when two of the parties get together. The process is called unlocking [1], and has been demonstrated experimentally [2]. More importantly, the bound entanglement can be activated with the help of entanglement in other systems [3]. The activation of bound entanglement, i.e., superactivation, plays an essential role in the QIP protocols using bound entangled states (e.g., remote information concentration [4]). © 2011 IEEE.
International conference proceedings, English - Measurement of reduced four-photon de Broglie wavelength at telecom wavelength
M. Yabuno; R. Shimizu; Y. Mitsumori; H. Kosaka; K. Edamatsu
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011, 2011, Peer-reviwed, The reduction of de Broglie wavelength is one of the fascinating characteristics of multiphoton quantum interference. It will be applicable to, for instance, super-resolution imaging beyond the classical diffraction limit and ultrasensitive phase measurement beyond the standard quantum limit. Thus far, the reduced de Broglie wavelength has been experimentally demonstrated using visible or near infrared photons [1-3]. However, it is still a challenging task to demonstrate multiphoton quantum interference in a telecom-wavelength region, because of insufficient quantum efficiencies of single-photon detectors working at telecom wavelength. Also, efficient photon sources of multiple photons that are mutually indistinguishable are essential to carry out various experiments including multiphoton quantum interference and quantum information protocols. In this context, we have developed an efficient photon-pair source designed for such multiphoton experiments at telecom wavelength. Making use of this source, we demonstrate the first measurement of reduced de Broglie wavelength of the four-photon state at the telecom wavelength. © 2011 IEEE.
International conference proceedings, English - Intrinsic pure single-photon source and its nonclassical interference with weak coherent photons
Rui-Bo Jin; Jun Zhang; Ryosuke Shimizu; Nobuyuki Matsuda; Yasuyoshi Mitsumori; Hideo Kosaka; Keiichi Edamatsu
QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING (QCMC): THE TENTH INTERNATIONAL CONFERENCE, AMER INST PHYSICS, 1363, 2011, Peer-reviwed, We report the generation of pure single-photon state in the process of spontaneous parametric down-conversion with extended phase-matching condition. The measured joint spectral distribution of the photon pairs shows a high purity of the state we prepared. A visibility of 89.4 +/- 0.5% was achieved without any spectral filtering in a nonclassical Hong-Ou-Mandel interference between pure heralded single photons and weak coherent photons.
International conference proceedings, English - Up-conversion dynamics for temporally entangled two-photon pulses
Masatoshi Nakatani; Ryosuke Shimizu; Kazuki Koshino
PHYSICAL REVIEW A, AMER PHYSICAL SOC, 83, 1, 013824/1-6, Jan. 2011, Peer-reviwed, We analyze the up conversion of a two-photon pulse having temporal entanglement on the basis of a full quantum formalism that treats both photons and optical media quantum mechanically. We derive a formula of the up-converted photon wave function, which is applicable to arbitrary input two-photon states for a three-level system, as the simplest second-order nonlinear optical system. As the input, we employ three kinds of temporally entangled two-photon pulses: correlated, uncorrelated, and anticorrelated. We observe the up-conversion efficiency and the temporal profile of the up-converted photon. Our results reveal the crossover behavior of the up conversion from anticorrelation to correlation and show how the temporal correlation in the input is reflected in the up-conversion process.
Scientific journal, English - Efficient Up-Conversion Detection of 1550 nm Photons Using Bulk Periodically-Poled LiNbO3
Atsushi Syouji; Shigehiro Nagano; Ryosuke Shimizu; Koji Suizu; Keiichi Edamatsu
JAPANESE JOURNAL OF APPLIED PHYSICS, IOP PUBLISHING LTD, 49, 4, 040213/1-3, 2010, Peer-reviwed, We demonstrate efficient up-conversion detection of photons at 1550 nm utilizing bulk periodically-poled LiNbO3 (PPLN) and nanosecond-pulsed pumping. An internal conversion efficiency of 96% and an overall photon detection efficiency of 19% including the efficiency of a visible photon detector were achieved with a low dark count rate. (C) 2010 The Japan Society of Applied Physics
Scientific journal, English - All-optical phase modulations in a silicon wire waveguide at ultralow light levels
Nobuyuki Matsuda; Ryosuke Shimizu; Yasuyoshi Mitsumori; Hideo Kosaka; Aya Sato; Hiroyuki Yokoyama; Koji Yamada; Toshifumi Watanabe; Tai Tsuchizawa; Hiroshi Fukuda; Seiichi Itabashi; Keiichi Edamatsu
APPLIED PHYSICS LETTERS, AMER INST PHYSICS, 95, 17, 171110/1-3, Oct. 2009, Peer-reviwed, Cross-phase modulation (XPM) in a silicon wire waveguide at 1.55 mu m telecom band was studied down to ultralow light levels. In the low-power regime, we found that free-carrier dispersion as well as the optical Kerr effect contributes to the XPM. Possible mechanisms of the low-power XPM are discussed. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3257378]
Scientific journal, English - High-flux and broadband biphoton sources with controlled frequency entanglement
Ryosuke Shimizu; Keiichi Edamatsu
OPTICS EXPRESS, OPTICAL SOC AMER, 17, 19, 16385-16393, Sep. 2009, Peer-reviwed, We report the high-flux and broadband generation of biphotons with controlled frequency entanglement. For the generation of the entangled state consisting of frequency-anticorrelated photons, we use PPMgSLT pumped by a continuous-wave (cw) laser. Meanwhile, the state consisting of frequency-correlated photons is produced from PPKTP under the extended phase-matching condition. Both states exhibited interference patterns with over 90% visibilities in two-photon interference experiments. (C) 2009 Optical Society of America
Scientific journal, English - Generation of Cross-Polarized Photon Pairs via Type-II Third-Order Quasi-Phase Matched Parametric Down-Conversion
Shigehiro Nagano; Atsushi Syouji; Ryosuke Shimizu; Koji Suizu; Hiromasa Ito; Keiichi Edamatsu
JAPANESE JOURNAL OF APPLIED PHYSICS, IOP PUBLISHING LTD, 48, 5, 050205/1-3, May 2009, Peer-reviwed, We have developed a high-efficiency source of cross-polarized photon pairs generated via type-II spontaneous parametric down-conversion using periodically poled lithium niobate (PPLN). The photon pairs are generated from bulk PPLN under third-order quasi-phase-matched conditions around 800 nm. We achieved a photon-pair production rate of N = 1.95 x 10(6) s(-1).mW(-1). (C) 2009 The Japan Society of Applied Physics
Scientific journal, English - Multimode Theory of Up-Conversion of Two Photons
Masatoshi Nakatani; Ryosuke Shimizu; Kazuki Koshino
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, PHYSICAL SOC JAPAN, 78, 5, 054401/1-7, May 2009, Peer-reviwed, The up-conversion dynamics of two photons in a three-level system is investigated theoretically. The analysis is based on a rigorous formalism that incorporates the multimode nature of the photon field, enabling quantitative handling of the spatial profiles of the photon pulses. We have derived an analytic formula that connects the wavefunction of two input photons to that of an up-converted output photon. The up-conversion efficiency and the output pulse profile are numerically calculated using this formula.
Scientific journal, English - Observation of optical-fibre Kerr nonlinearity at the single-photon level
Nobuyuki Matsuda; Ryosuke Shimizu; Yasuyoshi Mitsumori; Hideo Kosaka; Keiichi Edamatsu
NATURE PHOTONICS, NATURE PUBLISHING GROUP, 3, 2, 95-98, Feb. 2009, Peer-reviwed, Optical fibres have proved to be an important medium for manipulating and generating light in applications including soliton transmission(1), light amplification(2), all-optical switching(3) and supercontinuum generation(4). In the quantum regime, fibres may prove useful for ultralow-power all-optical signal processing(5) and quantum information processing(6). Here, we demonstrate the first experimental observation of optical nonlinearity at the single-photon level in an optical fibre. Taking advantage of the large nonlinearity and managed dispersion of photonic crystal. bres(7,8), we report very small (1 x 10(-7) to similar to 1 x 10(-8) rad) conditional phase shifts induced by weak coherent pulses that contain one or less than one photon per pulse on average. We discuss the feasibility of quantum information processing using optical fibres, taking into account the observed Kerr nonlinearity, accompanied by ultrafast response time and low induced loss.
Scientific journal, English - Measurement of the cross-Kerr nonlinearity induced by a single-photon-level coherenet pulse in a photonic crystal fiber
N. Matsuda; R. Shimizu; Y. Mitumori; H. Kosaka; K. Edamatsu
Proc. 9th Int. Conf. on Quantum Communication, Measurement and Computing, 228, 2009, Peer-reviwed
Scientific journal, English - Generation of polarization entanglement from spatially correlated photons in spontaneous parametric down-conversion
Ryosuke Shimizu; Takashi Yamaguchi; Yasuyoshi Mitsumori; Hideo Kosaka; Keiichi Edamatsu
PHYSICAL REVIEW A, AMER PHYSICAL SOC, 77, 3, 032338/1-4, Mar. 2008, Peer-reviwed, We propose a scheme to generate polarization entanglement from spatially correlated photon pairs. We experimentally realized a scheme by means of a spatial correlation effect in a spontaneous parametric down-conversion and a modified Michelson interferometer. The scheme we propose in this paper can be interpreted as a conversion process from spatial correlation to polarization entanglement.
Scientific journal, English - Temperature dependence of blue fight-induced near-infrared absorption of ferroelectric crystals
S. Nagano; R. Shimizu; A. Shoji; K. Suizu; K. Edamatsu
2008 CONFERENCE ON LASERS AND ELECTRO-OPTICS & QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE, VOLS 1-9, IEEE, 2439-+, 2008, Peer-reviwed, We studied blue light-induced near-infrared absorption (BLINIRA) and its temperature dependence in ferroelectric crystals, i.e., MgO-doped stoichiometric-LiNbO3, congruent-LiNbO3, MgO-doped stoichiometric-LiTaO3, and stoichiometric-LiTaO3. We found the BLINIRA decreased with the increase of temperature. (C) 2008 Optical Society of America
International conference proceedings, English - Generation of cross-polarized photon pairs in a 800-nm band via type-II parametric down-conversion using a periodically poled Lithium Niobate
S. Nagano; K. Suizu; Y. Sugiura; R. Shimizu; K. Edamatsu; H. Ito
Proc. 16th IEEE Int. Symp. on the Applications of Ferroelectrics (ISAF2007), 846-848, Dec. 2007, Peer-reviwed
International conference proceedings, English - 800-nm band cross-polarized photon pair source using type-II parametric down-conversion in periodically poled lithium niobate
Shigehiro Nagano; Ryosuke Shimizu; Yohei Sugiura; Koji Suizu; Keiichi Edamatsu; Hiromasa Ito
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, JAPAN SOC APPLIED PHYSICS, 46, 41-44, L1064-L1067, Nov. 2007, Peer-reviwed, We report a high-efficiency source of cross-polarized photon pairs via type-II quasi-phase matched spontaneous parametric down-conversion using periodically poled lithium niobate (PPLN). The photon pairs are generated from the PPLN in a fifth-order quasi-phase matching condition around 800 nm, which matches the wavelength band of efficient Si avalanche photo-diodes. We obtained the photon-pair production rate of 6.8 x 10(5) s(-1) mW(-1).
Scientific journal, English - Polarization entanglement of photons from a biexciton
K. Edamatsu; G. Oohata; R. Shimizu
Proc. 8th Int. Conf. on Quantum Communication, Measurement and Computing, 1-4, Jul. 2007, Peer-reviwed, Invited
International conference proceedings, English - Generation of polarization entangled photons using a spatial correlation in spontaneous parametric down-conversion
R. Shimizu; T. Yamaguchi; Y. Mitsumori; H. Kosaka; K. Edamatsu
Proc. 8th Int. Conf. on Quantum Communication, Measurement and Computing, 43-46, Jul. 2007, Peer-reviwed
International conference proceedings, English - Cross-polarized photon pair source using type-II quasi-phase matched parametric down-conversion
S. Nagano; K. Suizu; Y. Sugiura; R. Shimizu; K. Edamatsu; H. Ito
Proc. CLEO/Pacific Rim 2007, 1126-1127, May 2007, Peer-reviwed
International conference proceedings, English - Photon polarization entanglement induced by biexciton: Experimental evidence for violation of Bell's inequality
Goro Oohata; Ryosuke Shimizu; Keiichi Edamatsu
PHYSICAL REVIEW LETTERS, AMER PHYSICAL SOC, 98, 14, 140503/1-4, Apr. 2007, Peer-reviwed, We have investigated the polarization entanglement between photon pairs generated from a biexciton in a CuCl single crystal via resonant hyperparametric scattering. The pulses of a high repetition pump are seen to provide improved statistical accuracy and the ability to test Bell's inequality. Our results clearly violate the inequality and thus manifest the quantum entanglement and nonlocality of the photon pairs. We also analyzed the quantum state of our photon pairs using quantum state tomography.
Scientific journal, English - Generation of polarization entanglement utilizing spatially correlated photon pairs from spontaneous parametric down-conversion
T. Yamaguchi; R. Shimizu; Y. Mitsumori; H. Kosaka; K. Edamatsu
Conference on Lasers and Electro-Optics Europe - Technical Digest, 2007, Peer-reviwed
International conference proceedings, English - Measurement of optical cross-Kerr nonlinearity induced by a few photons in a photonic crystal fiber
N. Matsuda; R. Shimizu; Y. Mitsumori; H. Kosaka; K. Edamatsu
Conference on Lasers and Electro-Optics Europe - Technical Digest, 2007, Peer-reviwed
International conference proceedings, English - Lossless all-optical phase gate using a polarization-division Sagnac interferometer applicable to a waveguide-type Kerr medium
Nobuyuki Matsuda; Yasuyoshi Mitsumori; Hideo Kosaka; Keiichi Edamatsu; Ryosuke Shimizu
Applied Physics Letters, 91, 17, 171119/1-3, 2007, We propose an apparatus that realizes direct observation of nonlinear phase shifts induced by cross-phase modulation. The apparatus is based on a polarization-division Sagnac interferometer incorporating Faraday rotators, which, in principle, enables phase robustness, flexibility, and lossless operation. Here, we present the measurement of nonlinear phase shifts in a photonic crystal fiber, demonstrating the advantage of our system in its application to waveguide-type Kerr media. This apparatus is applicable to lossless all-optical phase gates and switches. © 2007 American Institute of Physics.
Scientific journal, English - Generation of entangled photons in a semiconductor and violation of Bell's inequality.
G. Oohata; R. Shimizu; K. Edamatsu
Proc. 8th Int. Symp. on Foundations of Quantum Mechanics in the Light of New Technology,, 50-53, Jul. 2006, Peer-reviwed, 通研インポート200703
International conference proceedings, English - Quantum diffraction and interference of spatially correlated photon pairs and its Fourier-optical analysis
Ryosuke Shimizu; Keiichi Edamatsu; Tadashi Itoh
PHYSICAL REVIEW A, AMERICAN PHYSICAL SOC, 74, 1, 013801/1-10, Jul. 2006, Peer-reviwed, We present one- and two-photon diffraction and interference experiments involving parametric down-converted photon pairs. By controlling the divergence of the pump beam in parametric down-conversion, the diffraction-interference pattern produced by an object changes from a quantum (perfectly correlated) case to a classical (uncorrelated) one. The observed diffraction and interference patterns are accurately reproduced by Fourier-optical analysis taking into account the quantum spatial correlation. We show that the relation between the spatial correlation and the object size plays a crucial role in the formation of both one- and two-photon diffraction-interference patterns.
Scientific journal, English - Generation of entangled photons via biexciton-resonant hyper-parametric scattering
G.Oohata; R. Shimizu; K. Edamatsu
Proc. SPIE, 5721, 15-18, Apr. 2005, Peer-reviwed, Invited
International conference proceedings, English - Entangled-photon generation from biexcitons in a semiconductor
G. Oohata; R. Shimizu; K. Edamatsu
2005 European Quantum Electronics Conference, EQEC '05, 2005, 252, 2005, Peer-reviwed
International conference proceedings, English - Entangled photon generation via biexciton-resonant hyper parametric scattering in a semiconductor
Goro Oohata; Ryosuke Shimizu; Keiichi Edamatsu
IQEC, International Quantum Electronics Conference Proceedings, 2005, 1006-1007, 2005, Peer-reviwed, We report the experimental realization of the entangled photon generation via biexciton-resonant hyper parametric scattering in CuCl crystal. Polarization correlation measurements and quantum tomographic analysis show that the generated photon-pairs have a high degree of polarization entanglement.
International conference proceedings, English - Generation of ultraviolet entangled photons in a semiconductor
K Edamatsu; G Oohata; R Shimizu; T Itoh
NATURE, NATURE PUBLISHING GROUP, 431, 7005, 167-170, Sep. 2004, Peer-reviwed, Entanglement is one of the key features of quantum information and communications technology. The method that has been used most frequently to generate highly entangled pairs of photons(1,2) is parametric down-conversion. Short-wavelength entangled photons are desirable for generating further entanglement between three or four photons, but it is difficult to use parametric down-conversion to generate suitably energetic entangled photon pairs. One method that is expected to be applicable for the generation of such photons(3) is resonant hyper-parametric scattering (RHPS): a pair of entangled photons is generated in a semiconductor via an electronically resonant third-order non-linear optical process. Semiconductor-based sources of entangled photons would also be advantageous for practical quantum technologies, but attempts to generate entangled photons in semiconductors have not yet been successful(4,5). Here we report experimental evidence for the generation of ultraviolet entangled photon pairs by means of biexciton resonant RHPS in a single crystal of the semiconductor CuCl. We anticipate that our results will open the way to the generation of entangled photons by current injection, analogous to current-driven single photon sources(6,7).
Scientific journal, English - Quantum diffraction and interference of spatially correlated photon pairs generated by spontaneous parametric down-conversion
R Shimizu; K Edamatsu; T Itoh
PHYSICAL REVIEW A, AMER PHYSICAL SOC, 67, 4, 041805(R)/1-4, Apr. 2003, Peer-reviwed, We demonstrate one- and two-photon diffraction and interference experiments utilizing parametric down-converted photon pairs (biphotons) and a transmission grating. With two-photon detection, the biphoton exhibits a diffraction-interference pattern equivalent to that of an effective single particle that is associated with half the wavelength of the constituent photons. With one-photon detection, however, no diffraction-interference pattern is observed. We show that these phenomena originate from the spatial quantum correlation between the down-converted photons.
Scientific journal, English - Diffraction and interference of entangled photon pairs generated by parametric down-conversion: A spatial correlation effect
Ryosuke Shimizu; Keiichi Edamatsu; Tadashi Itoh
2003 European Quantum Electronics Conference, EQEC 2003, Institute of Electrical and Electronics Engineers Inc., 341, 2003, Peer-reviwed, Diffraction-interference patterns of parametric down-converted photons through a transmission grating by both one- and two-photon detection schemes are presented. The measured patterns are explained by the Fourier analysis of the two-photon wave packet, considering the quantum spatial correlation between the constituent photons. Spatial diffraction-interference patterns were recorded by a two-photon detector consisting of two avalanche photodiodes. For comparison, diffraction-interference patterns of Ti:sapphire laser are also observed using the same apparatus (a uncorrelated case).
International conference proceedings, English - Quantum diffraction and interference of spatially correlated photon pairs generated by spontaneous parametric down-conversion
Ryosuke Shimizu; Keiichi Edamatsu; Tadashi Itoh
Physical Review A - Atomic, Molecular, and Optical Physics, 67, 4, 4, 2003, Peer-reviwed, We demonstrate one- and two-photon diffraction and interference experiments utilizing parametric down-converted photon pairs (biphotons) and a transmission grating. With two-photon detection, the biphoton exhibits a diffraction-interference pattern equivalent to that of an effective single particle that is associated with half the wavelength of the constituent photons. With one-photon detection, however, no diffraction-interference pattern is observed. We show that these phenomena originate from the spatial quantum correlation between the down-converted photons. © 2003 The American Physical Society.
Scientific journal, English - Measurement of the photonic de Broglie wavelength of entangled photon pairs generated by spontaneous parametric down-conversion
K Edamatsu; R Shimizu; T Itoh
PHYSICAL REVIEW LETTERS, AMERICAN PHYSICAL SOC, 89, 21, 213601/1-4, Nov. 2002, Peer-reviwed, Using a basic Mach-Zehnder interferometer, we demonstrate experimentally the measurement of the photonic de Broglie wavelength of entangled photon pairs (biphotons) generated by spontaneous parametric down-conversion. The observed interference manifests the concept of the photonic de Broglie wavelength. We also discuss the phase uncertainty obtained from the experiment.
Scientific journal, English - Quantum interference and diffraction of parametric down-converted biphotons
R. Shimizu; K. Edamatsu; T Itoh
Pramana-J. Phys., 59, 165-168, 2002, Peer-reviwed, Invited
Scientific journal, English - Measurement of the photonic de Broglie wavelength of parametric down-converted photons using a Mach-Zehnder interferometer
K. Edamatsu; R. Shimizu; T. Itoh
Proc. of the 7th Int. Symp. on Foundations of Quantum Mechanics in the Light of New Technology, 104-107, 2002, Peer-reviwed
International conference proceedings, English - Biphoton interference and photonic de Broglie wavelength of parametric downconverted photons
R. Shimizu; K. Edamatsu; T. Itoh
Technical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001, Institute of Electrical and Electronics Engineers Inc., 69-70, 2001, Peer-reviwed, Summary form only given. Recently, Jacobson et al. ( see Phys. Rev. Lett., vol.74, p. 4835 (1995)) proposed the concept of "photonic de Broglie wave" in multiphoton states. They argued that the photonic de Broglie wavelength of an ensemble of photons with wavelength λ0 and average number of photons N can be measured using a special interferometer with "effective beam splitters" that do not split the multiphoton states into constituent photons. Fonseca et al. see Phys. Rev. Lett., vol. 82, p. 2868 (1999)) measured the photonic de Broglie wavelength of a two-photon state ("biphoton") using a kind of Young's interferometer. We propose and demonstrate the measurement of photonic de Broglie wavelength of biphotons generated by parametric down-conversion utilizing the usual Mach-Zehnder interferometer.
International conference proceedings, English - Biphoton interferometry to observe photonic de Broglie wavelength
R Shimizu; K Edamatsu; T Itoh
CLEO(R)/PACIFIC RIM 2001, VOL II, TECHNICAL DIGEST, IEEE, 420-421, 2001, Peer-reviwed, In terms of the concept of "photonic de Broglie wave" in multiphoton states, we demonstrate biphoton interference experiments using a Mach-Zehnder interferometer. We have observed interferometric oscillations corresponding to the photonic de Broglie wavelength of the biphoton.
International conference proceedings, English
MISC
- ウィナー・ヒンチン定理の拡張と二光子量子干渉
清水亮介
日本光学会, Jun. 2019, 光学, 46, 6, 214, Japanese, Invited, Introduction scientific journal - 光空間通信における物理レイヤ暗号に向けた通信路推定実験
遠藤寛之; 藤原幹生; 北村光雄; 都筑織衛; 伊藤寿之; 清水亮介; 豊嶋守生; 竹中秀樹; 武岡正裕; 佐々木雅英
情報通信研究機構, 2017, 情報通信研究機構研究報告, 65, 1, 27-34, Japanese, Technical report, 2187-767X, 40021369839, AA12625974 - 2015年日本光学会の研究動向（量子光学・非線形光学）
清水亮介
日本光学会, Apr. 2016, 光学, 45, 4, 130-132, Japanese, Peer-reviwed, Invited, Introduction scientific journal, 0389-6625, 40020828856, AN00080324 - 量子ネットワークの実現に向けた高速量子もつれ交換
清水亮介; 金鋭博; 佐々木雅英
25 Aug. 2015, O plus E, 37, 9, 707-712, Japanese, Invited, Introduction commerce magazine - Nonclassical interference between independent intrinsically pure single photons at telecommunication wavelength (vol 87, 063801, 2013)
Rui-Bo Jin; Kentaro Wakui; Ryosuke Shimizu; Hugo Benichi; Shigehito Miki; Taro Yamashita; Hirotaka Terai; Zhen Wang; Mikio Fujiwara; Masahide Sasaki
AMER PHYSICAL SOC, Apr. 2014, PHYSICAL REVIEW A, 89, 4, English, Others, 1050-2947, 1094-1622, WOS:000335497500009 - Two-photon interference between independent single photons at telecommunication wavelength
Shimizu R.; Jin R.B.; Wakui K.; Benichi Hugo; Miki S.; Yamashita T.; Terai H.; Wang Z.; Sasaki M.
The Physical Society of Japan (JPS), 26 Aug. 2013, Meeting abstracts of the Physical Society of Japan, 68, 2, 146-146, Japanese, 1342-8349, 110009754656, AA11439205 - Generation of polarization-entangled photon pairs using two-period quasi-phase matched linbo
3
Wakana Ueno; Fumihiro Kaneda; Hirofumi Suzuki; Shigehiro Nagano; Atsushi Syouji; Ryosuke Shimizu; Koji Suizu; Keiichi Edamatsu
We demonstrate the generation of polarization-entangled photon pairs at telecommunication wavelengths with type-II quasi-phase matched spontaneous parametric downconversion (QPM-SPDC) having two poling periods. The generated two-photon polarization state was analyzed by the quantum state tomography. © 2011 AOS., 01 Dec. 2011, Optics InfoBase Conference Papers, 1761-1763, 84894253168 - 24aED-8 Observation of Activation of Bound Entanglement
Kaneda F.; Shimizu R.; Ishizaka S.; Mitsumori Y.; Kosaka H.; Edamatsu K.
The Physical Society of Japan (JPS), 24 Aug. 2011, Meeting abstracts of the Physical Society of Japan, 66, 2, 187-187, Japanese, 1342-8349, 110008757906, AA11439205 - 25pRF-9 Generation of Smolin state using photon polarization qubits
Kaneda F.; Shimizu R.; Mitsumori Y.; Kosaka H.; Edamatsu K.
The Physical Society of Japan (JPS), 18 Aug. 2010, Meeting abstracts of the Physical Society of Japan, 65, 2, 156-156, Japanese, 1342-8349, 110008097031, AA11439205 - 25pRF-8 Non-classical interference of up-converted photon pairs
Syouji A.; Nagano S.; Shimizu R.; Suizu K.; Edamatsu K.
The Physical Society of Japan (JPS), 18 Aug. 2010, Meeting abstracts of the Physical Society of Japan, 65, 2, 155-155, Japanese, 1342-8349, 110008097030, AA11439205 - 20pTD-8 Observation of two-photon quantum beating with two poling period LiNbO_3
Kaneda F.; Suzuki H.; Shimizu R.; Shouji A.; Nagano S.; Suizu K.; Edamatsu K.
The Physical Society of Japan (JPS), 01 Mar. 2010, Meeting abstracts of the Physical Society of Japan, 65, 1, 173-173, Japanese, 1342-8349, 110007654432, AA11439205 - 20pTD-6 Two-photon interference with controlled frequency-entangled photons
Shimizu R.; Edamatsu K.
The Physical Society of Japan (JPS), 01 Mar. 2010, Meeting abstracts of the Physical Society of Japan, 65, 1, 172-172, Japanese, 1342-8349, 110007654430, AA11439205 - 26aZF-3 Up-conversion detection of 1550 nm photon pair using a periodically poled LiNbO_3
Syouji A.; Ueno W.; Nagano S.; Shimizu R.; Suizu K.; Edamatsu K.
The Physical Society of Japan (JPS), 18 Aug. 2009, Meeting abstracts of the Physical Society of Japan, 64, 2, 69-69, Japanese, 1342-8349, 110007496216, AA11439205 - 25aZF-9 Generation of biphotons with controlled frequency entanglement
Shimizu R.; Edamatsu K.
The Physical Society of Japan (JPS), 18 Aug. 2009, Meeting abstracts of the Physical Society of Japan, 64, 2, 57-57, Japanese, 1342-8349, 110007496166, AA11439205 - 25pZF-9 Observation of four-photon interference utilizing parametric down-conversion driven by an Yb laser
Kaneda F.; Shimizu R.; Mitsumori Y.; Kosaka H.; Edamatsu K.
The Physical Society of Japan (JPS), 18 Aug. 2009, Meeting abstracts of the Physical Society of Japan, 64, 2, 63-63, Japanese, 1342-8349, 110007496192, AA11439205 - 28aSD-3 Efficient generation of multi-photon entangled state by a Yb laser
Kaneda F.; Shimizu R.; Mitsumori Y.; Kosaka H.; Edamatsu K.
The Physical Society of Japan (JPS), 03 Mar. 2009, Meeting abstracts of the Physical Society of Japan, 64, 1, 149-149, Japanese, 1342-8349, 110007370244, AA11439205 - 27pSK-3 High efficient up-conversion of 1550nm photons using a periodically poled LiNbO_3
Syouji A.; Nagano S.; Shimizu R.; Suizu K.; Edamatsu K.
The Physical Society of Japan (JPS), 03 Mar. 2009, Meeting abstracts of the Physical Society of Japan, 64, 1, 142-142, Japanese, 1342-8349, 110007370218, AA11439205 - 量子リソグラフィー －量子もつれ光子対の回折と干渉－
清水亮介
日本工業出版, 2009, 光アライアンス, 20, 10, 10-14, Japanese, Invited, Introduction commerce magazine, 0917-026X, 40016840029, AA11758790 - 22pZA-9 Improvement of coincidence/accidental contrast of correlated photon pairs from a photonic crystal fiber using a high-repetition pump
Matsuda N.; Sergej M.; Matsuura S.; Shimizu R.; Mitsumori Y.; Kosaka H.; Edamatsu K.
The Physical Society of Japan (JPS), 25 Aug. 2008, Meeting abstracts of the Physical Society of Japan, 63, 2, 141-141, Japanese, 1342-8349, 110006982904, AA11439205 - 22pZA-10 Up-conversion of parametric fluorescence using a periodically poled LiNbO_3
Syouji A.; Nagano S.; Shimizu R.; Suizu K.; Edamatsu K.
The Physical Society of Japan (JPS), 25 Aug. 2008, Meeting abstracts of the Physical Society of Japan, 63, 2, 141-141, Japanese, 1342-8349, 110006982905, AA11439205 - 22pZA-8 Generation of polarization entangled photon pairs using PPLN under the type-II phase matching condition
Suzuki H.; Nagano S.; Syouji A.; Shimizu R.; Suizu K.; Edamatsu K.
The Physical Society of Japan (JPS), 25 Aug. 2008, Meeting abstracts of the Physical Society of Japan, 63, 2, 141-141, Japanese, 1342-8349, 110006982903, AA11439205 - 23pQD-7 Measurement of few-photon-induced nonlinear phase shifts in a photonic crystal fiber II
Matsuda N.; Shimizu R.; Mitsumori Y.; Kosaka H.; Edamatsu K.
The Physical Society of Japan (JPS), 29 Feb. 2008, Meeting abstracts of the Physical Society of Japan, 63, 1, 150-150, Japanese, 1342-8349, 110007191729, AA11439205 - 24aRH-3 Generation of polarization entangled photon pairs using PPLN under the near-collinear type-II phase-matching condition II
Shimizu R.; Sugiura Y.; Nagano S.; Suizu K.; Edamatsu K.
The Physical Society of Japan (JPS), 21 Aug. 2007, Meeting abstracts of the Physical Society of Japan, 62, 2, 198-198, Japanese, 1342-8349, 110007143314, AA11439205 - 24aRH-2 Generation of polarization entangled photon pairs utilizing a spatial correlation effect in spontaneous parametric down-conversion III
Yamaguchi T.; Shimizu R.; Nagano S.; Suizu K.; Mitsumori Y.; Kosaka H.; Edamatsu K.
The Physical Society of Japan (JPS), 21 Aug. 2007, Meeting abstracts of the Physical Society of Japan, 62, 2, 197-197, Japanese, 1342-8349, 110007143315, AA11439205 - 24aRH-1 Measurement of few-photon-induced nonlinear phase shifts in a photonic crystal fiber
Matsuda N.; Shimizu R.; Mitsumori Y.; Kosaka H.; Edamatsu K.
The Physical Society of Japan (JPS), 21 Aug. 2007, Meeting abstracts of the Physical Society of Japan, 62, 2, 197-197, Japanese, 1342-8349, 110007143316, AA11439205 - 24pRG-2 1550nm band photon pair generation via parametric down conversion using a periodically poled LiNbO_3
Syouji A.; Nagano S.; Shimizu R.; Suizu K.; Edamatsu K.
The Physical Society of Japan (JPS), 21 Aug. 2007, Meeting abstracts of the Physical Society of Japan, 62, 2, 201-201, Japanese, 1342-8349, 110007143303, AA11439205 - 21pXK-7 Generation of polarization entangled photon pairs using PPLN under the near-collinear Type-II phase matching condition
Sugiura Y.; Shimizu R.; Edamatsu K.; Nagano S.; Sugiyama T.; Suizu K.; Ito H.
The Physical Society of Japan (JPS), 28 Feb. 2007, Meeting abstracts of the Physical Society of Japan, 62, 1, 177-177, Japanese, 1342-8349, 110007193517, AA11439205 - 25aRB-7 Measurement of small phase shifts with a polarization-division Sagnac interferometer
Matsuda N.; Shimizu R.; Mitsumori Y.; Kosaka H.; Edamatsu K.
The Physical Society of Japan (JPS), 18 Aug. 2006, Meeting abstracts of the Physical Society of Japan, 61, 2, 110-110, Japanese, 1342-8349, 110007178537, AA11439205 - 27aTA-13 Measurement of nonlinear phase shifts in a photonic crystal fiber using a polarization Sagnac interferometer
Matsuda Nobuyuki; Shimizu Ryosuke; Mitsumori Yasuyoshi; Kosaka Hideo; Edamatsu Keiichi
The Physical Society of Japan (JPS), 04 Mar. 2006, Meeting abstracts of the Physical Society of Japan, 61, 1, 136-136, Japanese, 1342-8349, 110007177230, AA11439205 - 30pSA-7 Generation of polarization entangled photon pairs utilizing a spatial correlation effect in spontaneous parametric down-conversion
Shimizu R.; Yamaguchi T.; Mitsumori Y.; Kosaka H.; Edamatsu K.
The Physical Society of Japan (JPS), 04 Mar. 2006, Meeting abstracts of the Physical Society of Japan, 61, 1, 187-187, Japanese, 1342-8349, 110007181281, AA11439205 - 量子もつれ光子対の干渉と回折
清水亮介; 枝松圭一
日本オプトメカトロニクス協会, 2006, 光技術コンタクト, 44, 11, 646-654, Japanese, Invited, Introduction commerce magazine, 0913-7289, 40015194076, AN10075091 - 21pWA-4 Generation of entangled photon pairs in a semiconductor II : Violation of Bell's inequality
Oohata Goro; Shimizu Ryosuke; Edamatsu Keiichi
The Physical Society of Japan (JPS), 19 Aug. 2005, Meeting abstracts of the Physical Society of Japan, 60, 2, 75-75, Japanese, 1342-8349, 110004537753, AA11439205 - 量子もつれ光子対
枝松圭一; 大畠悟郎; 清水亮介
日本オプトメカトロニクス協会, 2005, 光技術コンタクト, 43, 7, 376-383, Japanese, Invited, Introduction commerce magazine, 0913-7289, 40006861152, AN10075091 - 量子もつれ光子対と量子干渉実験
枝松圭一; 大畠悟郎; 清水亮介
新技術コミュニケ-ションズ, 2005, O plus E, 27, 6, 622-628, Japanese, Invited, Introduction commerce magazine, 0911-5943, 40006789812, AN00360954 - 12pXC-1 Observation of entangled photon pairs generated from biexciton state
Oohata G.; Shimizu R.; Edamatsu K.; Itoh T.
The Physical Society of Japan (JPS), 25 Aug. 2004, Meeting abstracts of the Physical Society of Japan, 59, 2, 637-637, Japanese, 1342-8349, 110002048455, AA11439205 - 29pXG-10 Generation of entangled photon pairs in a semiconductor
Oohata G.; Shimizu R.; Edamatsu K.; Itoh T.
The Physical Society of Japan (JPS), 03 Mar. 2004, Meeting abstracts of the Physical Society of Japan, 59, 1, 186-186, Japanese, 1342-8349, 110002186566, AA11439205 - 量子もつれ光子対の回折・干渉と量子リソグラフィー
清水亮介; 枝松圭一
応用物理学会分科会日本光学会, 2004, 光学, 33, 5, 291-293, Japanese, Peer-reviwed, Invited, Introduction scientific journal, 0389-6625, 10012945943, AN00080324 - Quantum diffraction-interference experiments using parametric down-converted photon pairs
Edamatsu K.; Shimizu R.
The Physical Society of Japan (JPS), 15 Aug. 2003, Meeting abstracts of the Physical Society of Japan, 58, 2, 858-858, Japanese, 1342-8349, 110002064616, AA11439205 - Phase measurement in two-photon interference of parametric down-converted photon pairs
Edamatsu K.; Shimizu R.
The Physical Society of Japan (JPS), 06 Mar. 2003, Meeting abstracts of the Physical Society of Japan, 58, 1, 168-168, Japanese, 1342-8349, 110002213280, AA11439205 - 非線形光学結晶を用いた量子もつれ合い光子対の発生と二光子干渉
枝松圭一; 清水亮介
アグネ技術センタ-, 2003, 固体物理, 38, 7, 471-477, Japanese, Invited, Introduction commerce magazine, 0454-4544, 40005854472, AN00092629 - Diffraction-interference of parametric down-converted biphotons : spatial correlation effect
Shimizu R; Edamatsu K; Itoh T
The Physical Society of Japan (JPS), 13 Aug. 2002, Meeting abstracts of the Physical Society of Japan, 57, 2, 116-116, Japanese, 1342-8349, 110009720176, AA11439205 - 24pWM-10 Diffraction-interference of parametric down-converted biphotons
Shimizu R.; Edamatsu K.; Itoh T.
The Physical Society of Japan (JPS), 01 Mar. 2002, Meeting abstracts of the Physical Society of Japan, 57, 1, 119-119, English, 1342-8349, 110009770726, AA11439205 - Biphoton interference using parametric down-converted photon I
Edamatsu K.; Shimizu R.
The Physical Society of Japan (JPS), 10 Sep. 2000, Meeting abstracts of the Physical Society of Japan, 55, 2, 100-100, Japanese, 1342-8349, 110002187641, AA11439205
Books and other publications
Lectures, oral presentations, etc.
- Quantum Spectroscopy using 2D Spectrum of Telecom-band Frequency Entangled Photons for Quantum Remote Sensing
Masahiro Ishizeki; Takeru Naito; Takahisa Kuwana; Akifumi Asahara; Ryosuke Shimizu; Kaoru Minoshima
Oral presentation, English, The 13th Advanced Lasers and Photon Sources (ALPS2024), Peer-reviewed
25 Apr. 2024
22 Apr. 2024- 26 Apr. 2024 - Measurement of detailed single-photon ultra-fast pulse characteristics by asynchronous optical sampling using a dual-wavelength combs
Hajime Komori; Prasad Koviri; Masahiro Ishizeki; Haochen Tian; Thomas R Schibli; Takashi Kato; Akifumi Asahara; Ryosuke Shimizu; Kaoru Minoshima
Oral presentation, English, The 13th Advanced Lasers and Photon Sources (ALPS2024), Peer-reviewed
25 Apr. 2024
22 Apr. 2024- 26 Apr. 2024 - Pathway selectivity in time-resolved spectroscopy by coincidence counting of quantum entangled photons
Yuta Fujihashi; Akihito Ishizaki; Ryosuke Shimizu
Oral presentation, English, The 13th Advanced Lasers and Photon Sources (ALPS2024), Peer-reviewed
25 Apr. 2024
22 Apr. 2024- 26 Apr. 2024 - Biphoton spectral reconstruction with delay-line-anode single-photon imagers
Ozora Iso; Kensuke Miyajima; Ryosuke Shimizu
Oral presentation, English, The 13th Advanced Lasers and Photon Sources (ALPS2024), Peer-reviewed
25 Apr. 2024
22 Apr. 2024- 26 Apr. 2024 - 実環境下における量子リモートセンシングに向けた周波数もつれ光子の非局所相関による量子分光法の開発
石関政洋; 大倉悠暉; 浅原彰文; 清水亮介; 美濃島薫
Oral presentation, Japanese, 第71回応用物理学会春季学術講演会
25 Mar. 2024
22 Mar. 2024- 25 Mar. 2024 - 遅延線型単一光子検出器を用いた二光子スペクトルの測定
磯大空; 宮島顕祐; 清水亮介
Oral presentation, Japanese, 第71回応用物理学会春季学術講演会
25 Mar. 2024
22 Mar. 2024- 25 Mar. 2024 - 分極反転デバイスによる時間-周波数量子もつれ光の操作と検出
清水亮介
Invited oral presentation, Japanese, 第71回応用物理学会春季学術講演会, Invited
23 Mar. 2024
22 Mar. 2024- 25 Mar. 2024 - Spectral modulation by temporal manipulation of a biphoton wave packet
Yuki Okura; Masahiro Yabuno; Fumihiro China; Shigehito Miki; Hirotaka Terai; Ryosuke Shimizu
Poster presentation, English, Quantum Innovation 2023
16 Nov. 2023
15 Nov. 2023- 17 Nov. 2023 - Biphoton spectral measurement with delay-line-anode single-photon detectors
Ozora Iso; Kensuke Miyajima; Ryosuke Shimizu
Poster presentation, English, Quantum Innovation 2023
16 Nov. 2023
15 Nov. 2023- 17 Nov. 2023 - 二波長同期光コムを用いた非同期光サンプリングによる単一光子レベルのフェムト秒時間分解計測法の開発
小森孟; Prasad Koviri; 石関政洋; 田 昊晨; Thomas R. Schibli; 加藤 峰士; 浅原 彰文; 清水 亮介; 美濃島 薫
Japanese, 第84回応用物理学会秋季学術講演会
21 Sep. 2023
19 Sep. 2023- 23 Sep. 2023 - 光ゲート法による超高速単一光子検出器の時間分解能評価
桑名隆久; 藪野正裕; 知名史博; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会第78回年次大会
18 Sep. 2023
16 Sep. 2023- 19 Sep. 2023 - 量子もつれ光子の時間操作によるスペクトル変調III
大倉悠暉; 内藤健; 藪野正裕; 知名史博; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会第78回年次大会
18 Sep. 2023
16 Sep. 2023- 19 Sep. 2023 - Quantum optical synthesis of a biphoton wave packet
Ryosuke Shimizu
Invited oral presentation, English, Progress in Electromagnetics Research Symposium (PIERS2023), Invited, Peer-reviewed
04 Jul. 2023
03 Jul. 2023- 06 Jul. 2023 - Direct measurement of biphoton temporal distributions with sub-ps resolution by optical Kerr Gating
Takahisa Kuwana; Masahiro Yabuno; Fumihiro China; Shigehito Miki; Hirotaka Terai; Peter J. Mosley; Rui-Bo Jin; Ryosuke Shimizu
Oral presentation, English, Progress in Electromagnetics Research Symposium (PIERS2023), Peer-reviewed
04 Jul. 2023
03 Jul. 2023- 06 Jul. 2023 - 分光計測としての量子もつれ光研究
清水亮介
Invited oral presentation, Japanese, 量子生命科学会第５回大会, Invited
18 May 2023
18 May 2023- 19 May 2023 - Measurement of biphoton temporal distribution using an optical Kerr gate
Takahisa Kuwana; Masahiro Yabuno; Fumihiro China; Shigehito Miki; Hirotaka Terai; Peter J. Mosley; Rui-Bo Jin; Ryosuke Shimizu
Oral presentation, English, The 12th Advanced Lasers and Photon Sources (ALPS2023), Peer-reviewed
20 Apr. 2023
18 Apr. 2023- 21 Apr. 2023 - Spectral modulation by temporal manipulation of a biphoton wave packet
Yuki Okura; Takeru Naito; Masahiro Yabuno; Fumihiro China; Shigehito Miki; Hirotaka Terai; Ryosuke Shimizu
Oral presentation, English, The 12th Advanced Lasers and Photon Sources (ALPS2023), Peer-reviewed
19 Apr. 2023
18 Apr. 2023- 21 Apr. 2023 - Ultrafast Time-resolved Single-photon Detection Method Using Two-color Asynchronous Optical Sampling
Prasad Koviri; Hajime Komori; Masahiro Ishizeki; Haochen Tian; Thomas R. Schibli; Takashi Kato; Akifumi Asahara; Ryosuke Shimizu; Kaoru Minoshima
Oral presentation, English, The 12th Advanced Lasers and Photon Sources (ALPS2023), Peer-reviewed
Apr. 2023
18 Apr. 2023- 21 Apr. 2023 - Fundamental study on quantum remote sensing using nonlocal correlation of frequency entangled photon pair generated by ultrashort pulse train for fiber network applications
Masahiro Ishizeki; Takeru Naito; Takahisa Kuwana; Akifumi Asahara; Ryosuke Shimizu; Kaoru Minoshima
The 12th Advanced Lasers and Photon Sources (ALPS2023), Peer-reviewed
Apr. 2023
18 Apr. 2023- 21 Apr. 2023 - 光カーゲート法による2光子時間分布測定II
桑名隆久; 藪野正裕; 知名史博; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会2023年春季大会
24 Mar. 2023
22 Mar. 2023- 25 Mar. 2023 - 量子もつれ光子の時間操作によるスペクトル変調II
大倉悠暉; 内藤健; 藪野正裕; 知名史博; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会2023年春季大会
24 Mar. 2023
22 Mar. 2023- 25 Mar. 2023 - 量子もつれ光子の非局所相関を利用したリモートセンシングに向けた周波数相関スペクトル測定の基礎検討
石関 政洋; 内藤 健; 桑名 隆久; 浅原 彰文; 清水 亮介; 美濃島 薫
Oral presentation, Japanese, 第70回応用物理学会春季学術講演会
Mar. 2023
15 Mar. 2023- 18 Mar. 2023 - Frequency-bin generation of entangled photons via quantum optical synthesis
Takeru Naito; Masahiro Yabuno; Fumihiro China; Shigehito Miki; Hirotaka Terai; Ryosuke Shimizu
Oral presentation, English, The 5th. International Forum on Quantum Metrology and Sensing (IFQMS)
29 Nov. 2022 - Ultrafast measurement of biphoton wave packets using optical Kerr gating
Takahisa Kuwana; Masahiro Yabuno; Fumihiro China; Shigehito Miki; Hirotaka Terai; Peter J. Mosley; Rui-Bo Jin; Ryosuke Shimizu
Oral presentation, English, The 5th. International Forum on Quantum Metrology and Sensing (IFQMS)
29 Nov. 2022 - ファイバネットワーク応用に向けたモード同期レーザーにより生成された伝令付き単一光子の伝送実験
石関政洋; 桑名; 浅原彰文; 清水亮介; 美濃島薫
Oral presentation, Japanese, 第5回レーザー学会「次世代ファイバレーザー技術」専門委員会
23 Sep. 2022 - Detection of Ultralow Intense Cross-correlation of Two-color Comb with Photon Counting Technique
Koviri, 石関; Tian, 小森; 浅原; 清水; 美濃島
Oral presentation, English, 第5回レーザー学会「次世代ファイバレーザー技術」専門委員会
23 Sep. 2022 - 超短パルスにより生成された伝令付き単一光子のファイバネットワーク伝送実験
石関政洋; 桑名; 浅原彰文; 清水亮介; 美濃島薫
Oral presentation, Japanese, 第83回応用物理学会秋季学術講演会
22 Sep. 2022 - Single-photon Level Detection of Ultrafast Cross-correlation Signal using Asynchronous Optical Sampling with Two-color Dual-comb System
Koviri, 石関; Tian, 小森; 浅原; 清水; 美濃島
Oral presentation, English, 第83回応用物理学会秋季学術講演会
22 Sep. 2022 - 光カーゲート法による2光子時間分布測定
桑名隆久; 藪野正裕; 知名史博; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会2022年秋季大会, Domestic conference
13 Sep. 2022 - 量子もつれ光子の時間操作によるスペクトル変調
内藤健; 藪野正裕; 知名史博; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会2022年秋季大会, Domestic conference
13 Sep. 2022 - 励起子分子発光の量子分光計測：2光子吸収スペクトルとの比較
関浩弥; 橋本慶太; 石原淳; 宮島顕祐; 清水亮介
Oral presentation, Japanese, 日本物理学会2022年秋季大会, Domestic conference
12 Sep. 2022 - Polarization Multiplexing of an Ultrafast Single-Photon Detector by Optical Kerr Gating
Takahisa Kuwana; Masahiro Yabuno; Fumihiro China; Shigehito Miki; Hirotaka Terai; Peter J. Mosley; Rui-Bo Jin; Ryosuke Shimizu
Oral presentation, English, The 15th Pacific Rim Conference on Lasers and Electro-Optics (CLEO-PR 2022), International conference
05 Aug. 2022 - Spectral modulation of biphotons via Fourier optical synthesis
Takeru Naito; Masahiro Yabuno; Fumihiro China; Shigehito Miki; Hirotaka Terai; Ryosuke Shimizu
Oral presentation, English, The 15th Pacific Rim Conference on Lasers and Electro-Optics (CLEO-PR 2022), International conference
04 Aug. 2022 - Temperature dependence of biexciton luminescence by joint spectral intensity measurement
Hiroya Seki; Keita Hashimoto; Jun Ishihara; Kensuke Miyajima; Ryosuke Shimizu
Poster presentation, English, The 15th Pacific Rim Conference on Lasers and Electro-Optics (CLEO-PR 2022), International conference
04 Aug. 2022 - Spectro-temporal Manipulation of Biphoton States at Telecom Wavelength
Rui-Bo Jin; Ryosuke Shimizu
Invited oral presentation, English, Progress in Electromagnetics Research Symposium (PIERS2021), Invited, Hangzhou, China, International conference
25 Apr. 2022 - 励起子分子から生成された2光子に対する量子もつれの温度依存性
関浩弥; 橋本慶太; 石原淳; 宮島顕祐; 清水亮介
Oral presentation, Japanese, 日本物理学会第７６回年次大会, Domestic conference
17 Mar. 2022 - 光カーゲート法を用いた超高速単一光子検出の偏光多重化
桑名隆久; 大島拡輝; 藪野正裕; 知名史博; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会第７６回年次大会, Domestic conference
17 Mar. 2022 - Selective measurement of biexciton luminescence by photon correlation spectroscopy
Hiroya Seki; Keita Hashimoto; Jun Ishihara; Kensuke Miyajima; Ryosuke Shimizu
Oral presentation, English, The 4th. International Forum on Quantum Metrology and Sensing (IFQMS2021), International conference
08 Dec. 2021 - Temporal shaping of an entangled-photon wave packet by Fourier optical synthesis
Hiroki Oshima; Fumihiro China; Masahiro Yabuno; Shigehito Miki; Hirotaka Terai; Ryosuke Shimizu
Oral presentation, English, The 4th. International Forum on Quantum Metrology and Sensing (IFQMS2021), International conference
08 Dec. 2021 - Phase retrieval of joint spectral amplitude
Kemeng Chen; Ryosuke Shimizu
Oral presentation, English, The 4th. International Forum on Quantum Metrology and Sensing (IFQMS2021), International conference
08 Dec. 2021 - フーリエ操作による量子もつれ光子の時間波束制御
大島拡輝; 藪野正裕; 知名史博; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会2021年秋季大会, Domestic conference
20 Sep. 2021 - 空間分解能を有する2光子検出装置の開発
陳柯萌; 清水亮介
Oral presentation, Japanese, 日本物理学会2021年秋季大会
20 Sep. 2021 - 光コムによる量子もつれ光子生成と時間分解検出法の検討
佐久間茂喜; 大島拡輝; 長谷川達也; 浅原彰文; 清水亮介; 美濃島薫
Oral presentation, Japanese, 第82回応用物理学会秋季学術講演会, Domestic conference
10 Sep. 2021 - Joint spectral intensity of two-photon emission from biexciton
Hiroya Seki; Dongeun Son; Yuta Uchibori; Jun Ishihara; Kensuke Miyajima; Ryosuke Shimizu
Oral presentation, English, The 10th Advanced Lasers and Photon Sources (ALPS2021), International conference
19 Apr. 2021 - 量子もつれ光子対スペクトルの散乱角度依存性II
関浩弥; 孫東根; 内堀裕太; 石原淳; 宮島顕祐; 清水亮介
Oral presentation, Japanese, 日本物理学会第７６回年次大会, Domestic conference
13 Mar. 2021 - 機械共有による受動相互コヒーレントな全偏波保持ファイバコムシステムの開発
楠美友悟; 長谷川達也; 佐久間茂喜; 中嶋善晶; 清水亮介; 美濃島薫
Oral presentation, Japanese, レーザー学会学術講演会第４１回年次大会, Domestic conference
20 Jan. 2021 - Development of single-photon detectors with spatial resolution
Kemeng Chen; Ryosuke Shimizu
Oral presentation, English, The 3rd International Forum on Quantum Metrology and Sensing (IFQMS), International conference
17 Dec. 2020 - Temperature dependence of photon-pair generation via biexciton
Donggeun Son; Hiroya Seki; Yuta Uchibori; Jun Ishihara; Kensuke Miyajima; Ryosuke Shimizu
Oral presentation, English, The 3rd International Forum on Quantum Metrology and Sensing (IFQMS), International conference
17 Dec. 2020 - Angular dependence of photon-pair generation via biexciton
Hiroya Seki; Donggeun Son; Yuta Uchibori; Jun Ishihara; Kensuke Miyajima; Ryosuke Shimizu
Oral presentation, English, The 3rd International Forum on Quantum Metrology and Sensing (IFQMS), International conference
17 Dec. 2020 - 量子もつれ光子対スペクトルの温度依存性
孫東根; 関浩弥; 内堀裕太; 石原淳; 宮島顕祐; 清水亮介
Oral presentation, Japanese, 日本物理学会2020年秋季大会, Domestic conference
10 Sep. 2020 - 量子もつれ光子対スペクトルの散乱角度依存性
関浩弥; 内堀裕太; 石原淳; 宮島顕祐; 清水亮介
Oral presentation, Japanese, 日本物理学会2020年秋季大会, Domestic conference
10 Sep. 2020 - Quantum optical synthesis of time-frequency entangled photons
Ryosuke Shimizu
Invited oral presentation, English, The 9th Advanced Lasers and Photon Sources (ALPS2020), Invited, International conference
20 Apr. 2020 - Fourier transform spectroscopy utilizing two-photon quantum interference
Hiroya Seki; Yuta Uchibori; Jun Ishihara; Kensuke Miyajima; Ryosuke Shimizu
Oral presentation, English, The 9th Advanced Lasers and Photon Sources (ALPS2020), International conference
20 Apr. 2020 - 励起子分子から生成された光子対の二次元量子分光II
孫東根; 関浩弥; 内堀裕太; 石原淳; 宮島顕祐; 清水亮介
Poster presentation, Japanese, 日本物理学会 第７５回年次大会, Domestic conference
Mar. 2020 - ２台のファイバコムによる２波長パルスの高精度同期法の検討
長谷川達也; 中嶋善晶; 李嘉傑; 清水亮介; 美濃島薫
Poster presentation, Japanese, 第６７回応用物理学会春季学術講演会, Domestic conference
Mar. 2020 - 和周波発生法による単一光子の超高速検出
坂田美紗樹; 田沢久留実; 知名史博; 藪野正裕; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, レーザー学会学術講演会第４０回年次大会, Domestic conference
22 Jan. 2020 - Direct measurement of a biphoton wave packet in time and frequency domains
Ryosuke Shimizu; Rui-Bo Jin
Oral presentation, English, The 2nd International Forum on Quantum Metrology and Sensing (IFQMS), International conference
18 Dec. 2019 - Fourier transform spectroscopy of biexciton with two-photon quantum interference
Hiroya Seki; Yuta Uchihori; Jun Ishihara; Kensuke Miyajima; Ryosuke Shimizu
Poster presentation, English, The 2nd International Forum on Quantum Metrology and Sensing (IFQMS), International conference
17 Dec. 2019 - Temporal shaping of a biphoton wave packet by 2D Fourier synthesis
Kurumi Tazawa; Fumihiro China; Masahiro Yabuno; Shigehito Miki; Hirotaka Terai; Ryosuke Shimizu
Poster presentation, English, The 2nd International Forum on Quantum Metrology and Sensing (IFQMS), International conference
17 Dec. 2019 - Development of ultrafast single-photon detection using an optical Kerr gate
Takahiro Takumi; Masahiro Yabuno; Shigehito Miki; Fumihiro China; Hirotaka Terai; Ryosuke Shimizu
Poster presentation, English, The 2nd International Forum on Quantum Metrology and Sensing (IFQMS), International conference
17 Dec. 2019 - Time-frequency duality of biphotons
Ryosuke Shimizu
Nominated symposium, English, Informal workshop at the Molecular Chirality Research Centre (MCRC), Invited
10 Oct. 2019 - Time-resolved measurement of a single-photon wave packet with an optical Kerr effect
Takahiro Takumi; Fumihiro China; Masahiro Yabuno; Shigehito Miki; Hirotaka Terai; Ryosuke Shimizu
Oral presentation, English, Single Photon Workshop 2019, International conference
Oct. 2019 - Quantum interference of photon pairs from biexciton toward Fourier transform spectroscopy
Hiroya Seki; Yuta Uchihori; Satoru Efumi; Jun Ishihara; Kensuke Miyajima; Ryosuke Shimizu
Poster presentation, English, Single Photon Workshop 2019, International conference
Oct. 2019 - 2光子スペクトル制御による単一光子の時間波束制御
坂田美紗樹; 田沢久留実; 知名史博; 藪野正裕; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会 2019年秋季大会, Domestic conference
12 Sep. 2019 - 光カーゲート法による超高速単一光子検出II
工貴大; 知名史博; 藪野正裕; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会 2019年秋季大会, Domestic conference
12 Sep. 2019 - 地上空間光伝送実験におけるpolar符号の性能評価
藤田紳吾; 伊藤啓太; 岡本英二; 竹中秀樹; 國森裕生; 遠藤寛之; 藤原幹生; 北村光雄; 清水亮介; 佐々木雅英; 豊嶋守生
Oral presentation, Japanese, 2019年電子情報通信学会ソサイエティ大会, Domestic conference
12 Sep. 2019 - 励起子分子から生成された光子対の量子フーリエ変換分光III
関浩弥; 内堀裕太; 江文智; 石原淳; 宮島顕祐; 清水亮介
Poster presentation, Japanese, 日本物理学会 2019年秋季大会, Domestic conference
12 Sep. 2019 - 光カーゲート法による伝令付き単一光子波束の観測
工貴大; 知名史博; 藪野正裕; 三木茂人; 寺井弘高; 清水亮介
Poster presentation, Japanese, 第16回原子・分子・光科学（AMO）討論会, International conference
14 Jun. 2019 - 任意時間波束操作に向けた離散周波数量子もつれ光子のスペクトル制御
田沢久留実; 知名史博; 藪野正裕; 三木茂人; 寺井弘高; 清水亮介
Poster presentation, Japanese, 第16回原子・分子・光科学（AMO）討論会, Domestic conference
14 Jun. 2019 - 量子もつれ光子のフーリエ操作による時間波束制御
坂田美紗樹; 淺村尚人; 知名史博; 藪野正裕; 三木茂人; 寺井弘高; 清水亮介
Poster presentation, Japanese, 第16回原子・分子・光科学（AMO）討論会, Domestic conference
14 Jun. 2019 - 励起子分子を介して生成たれた光子対の差周波型量子フーリエ変換分光
関浩弥; 内堀裕太; 江文智; 石原淳; 宮島顕祐; 清水亮介
Poster presentation, Japanese, 第16回原子・分子・光科学（AMO）討論会, Domestic conference
14 Jun. 2019 - 量子もつれ光子の時間－周波数分布操作
清水亮介
Invited oral presentation, Japanese, フォトニックネットワーク研究会, Invited, Domestic conference
26 Apr. 2019 - 量子もつれ光子に対するフーリエ二重性の研究
清水亮介
Invited oral presentation, Japanese, 光科学技術研究振興財団平成３０年度研究助成金贈呈式, Invited, Domestic conference
07 Mar. 2019 - 励起子分子から生成された光子対の量子フーリエ変換分光II
関浩弥; 佐久間翔平; 内堀裕太; 江文智; 石原淳; 宮島顕祐; 清水亮介
Oral presentation, Japanese, 日本物理学会 第７４回年次大会, Domestic conference
Mar. 2019 - 任意時間波束操作に向けた2光子スペクトルの多モード化II
田沢久留実; 淺村尚人; 藪野正裕; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会 第７４回年次大会, Domestic conference
Mar. 2019 - 2光子時間波束位相変調による量子もつれ光子のスペクトル操作II
八木澤拓実; 淺村尚人; 藪野正裕; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会 第７４回年次大会, Domestic conference
Mar. 2019 - 光カーゲート法による超高速単一光子検出
工貴大; 内藤僚; 藪野正裕; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会 第７４回年次大会, Domestic conference
Mar. 2019 - 大気揺らぎ予測モデルの掲示による適合度低下について
竹中秀樹; 遠藤寛之; 藤原幹生; 北村光雄; 都筑織衞; 清水亮介
Oral presentation, Japanese, 2019年電子情報通信学会総合大会, Domestic conference
Mar. 2019 - 二次元周波数空間中での励起子分子スペクトル計測
佐久間翔平; 江文智; 内堀裕太; 石原淳; 宮島顕祐; 清水亮介
Poster presentation, Japanese, 第29回光物性研究会, Domestic conference
Dec. 2018 - 励起子分子から生成された光子対の差周波型量子干渉
関浩弥; 佐久間翔平; 堀裕太; 江文智; 内石原淳; 宮島顕祐; 清水亮介
Poster presentation, Japanese, 第29回光物性研究会, Domestic conference
Dec. 2018 - Duality between time and Frerquency distributions of biphotons
Ryosuke Shimizu
Public discourse, English, The 3rd China Optics Valley Aerospace Laser & Quantum Technology Forum, Invited, International conference
13 Nov. 2018 - Direct measurement of time-frequency distribution of biphotons
Ryosuke Shimizu
Oral presentation, English, The 5th. MIPT-UEC-LPI International Workshop on Atomic, Molecular and Optical Physics, International conference
02 Oct. 2018 - シングルピクセルの超伝導ナノワイヤ単一光子検出器を用いた時分割多重検出型位置検出および分光検出システムの開発
藪野正裕; 知名史博; 三木茂人; 清水亮介; 寺井弘高
Poster presentation, Japanese, 応用物理学会秋季学術講演会, Domestic conference
19 Sep. 2018 - 励起子分子から生成された光子対の量子フーリエ変換分光
関浩弥; 佐久間翔平; 内堀裕太; 江文智; 石原淳; 宮島顕祐; 清水亮介
Oral presentation, Japanese, 日本物理学会, Domestic conference
10 Sep. 2018 - 励起子分子から生成された光子対の二次元量子分光
佐久間翔平; 内堀裕太; 江文智; 石原淳; 宮島顕祐; 清水亮介
Oral presentation, Japanese, 日本物理学会, Domestic conference
10 Sep. 2018 - 分光計測として量子光学測定
清水亮介
Oral presentation, Japanese, 日本物理学会, Domestic conference
10 Sep. 2018 - 2光子時間位相変調による量子もつれ光子のスペクトル操作
八木澤拓実; 淺村尚人; 藪野正裕; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会, Domestic conference
09 Sep. 2018 - 任意時間波束操作に向けた2光子スペクトルの多モード化
田沢久留実; 淺村尚人; 藪野正裕; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会, Domestic conference
09 Sep. 2018 - ２光子スペクトル位相変調による量子もつれ光子の時間波束操作
淺村尚人; 藪野正裕; 三木茂人; 寺井弘高; 清水亮介
Oral presentation, Japanese, 日本物理学会, Domestic conference
09 Sep. 2018 - Quantum interferometric spectroscopy
Rui-Bo Jin; Ryosuke Shimizu
Oral presentation, English, Pacific Rim Conference on Laser and Electro-Optics (CLEO PacificRim 2018), International conference
03 Aug. 2018 - Time-frequency distributions of a biphoton wave packet
Ryosuke Shimizu
Invited oral presentation, English, Progress in Electromagnetics Research Symposium (PIERS2018), Invited, International conference
03 Aug. 2018 - Temperature dependence of polarization entanglement generated from biexciton.
Shouhei Sakuma; Satoru Efumi; Jun Ishihara; Kensuke Miyajima; Ryosuke Shimizu
Poster presentation, English, The 12th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials (EXCON2018), International conference
Jul. 2018 - フーリエ操作による量子もつれ光子の時間波束制御
淺村尚人; 清水亮介
Oral presentation, Japanese, 日本物理学会, Domestic conference
22 Mar. 2018 - 励起子分子より生成された光子の量子相関の温度依存性
佐久間翔平; 江文智; 石原淳; 宮島顕祐; 清水亮介
Poster presentation, Japanese, 日本物理学会, Domestic conference
22 Mar. 2018 - Fourier optics for entangled photons
Ryosuke Shimizu
Invited oral presentation, English, Okinawa School in Physics 2017: Coherent Quantum Dynamics (CQD2017), Invited
26 Sep. 2017 - 正の周波数相関を持つ２光子のスペクトル－位相制御
淺村尚人; 清水亮介
Oral presentation, Japanese, 日本物理学会 2017年秋季大会, Domestic conference
21 Sep. 2017 - 周波数上方変換を用いた通信波長帯単一光子の高時間分解検出-ビーム入射角依存性-
井藤魁; 淺村尚人; 清水亮介; 早瀬潤子
Oral presentation, Japanese, 第78回応用物理学会秋季学術講演会, Domestic conference
05 Sep. 2017 - Control of time-frequency quantum correlation of a biphoton wavepacket
Ryosuke Shimizu
Invited oral presentation, Japanese, 分子研セミナー, Invited, Domestic conference
30 Aug. 2017 - Beam angle dependence of time-resolved single-photon detection in communication band by frequency up-conversion
Kai Ito; Ryosuke Shimizu; Junko Ishi-Hayase
Poster presentation, English, The 24th Congress of the International Commission for Optics, International conference
22 Aug. 2017 - 量子もつれ光子の時間－周波数領域における二重性
清水 亮介; 齋藤 拓真
Poster presentation, Japanese, 第14回AMO討論会, Domestic conference
30 Jun. 2017 - 離散周波数量子もつれ光子のスペクトル－位相制御
淺村尚人; 椎名良治; 清水亮介
Poster presentation, Japanese, 第14回AMO討論会, Domestic conference
30 Jun. 2017 - 量子光学測定の分光計測への応用
佐久間翔平; 宇野諒; 橋本優吾; 宮島顕祐; 清水亮介
Poster presentation, Japanese, 第14回AMO討論会, Domestic conference
30 Jun. 2017 - 周波数量子もつれ光子の時間分布計測とフーリエ二重性
清水亮介; 齊藤拓真
Oral presentation, Japanese, レーザー学会 学術講演会 第３７回年次大会, Domestic conference
Jan. 2017 - 分光計測としての量子状態トモグラフィ
宇野諒; 橋本優吾; 宮島顕祐; 清水亮介
Poster presentation, Japanese, 第27回光物性研究会, Domestic conference
Dec. 2016 - 量子もつれ光子のスペクトル－位相制御
椎名良治; 清水亮介
Oral presentation, Japanese, Optics & Photonics Japan 2016, Domestic conference
Nov. 2016 - 量子もつれ光子の時間分布計測とフーリエ二重性
清水亮介; 齊藤拓真
Oral presentation, Japanese, Optics & Photonics Japan 2016, Domestic conference
Nov. 2016 - CuCl単結晶から生成された偏光量子もつれ光子の単一モードファイバを用いた観測
宇野諒; 橋本優吾; 宮島顕祐; 清水亮介
Poster presentation, Japanese, 日本物理学会 2016年秋季大会, Domestic conference
20 Sep. 2016 - SSPDを用いた時間分割多重型単一光子分光検出システムの開発
藪野正裕; 山下太郎; 三木茂人; 清水亮介; 寺井弘高
Oral presentation, Japanese, 第７７回応用物理学会秋季学術講演会, Domestic conference
14 Sep. 2016 - Gamma-Gammaフェージングの影響下における単一光子検出器を用いた通信シミュレーション．
小林優輔; 國森裕生; 遠藤寛之; 藤原幹生; 北村光雄; 伊藤寿之; 佐々木雅英; 清水亮介; 青木隆朗; 行田弘一
Oral presentation, Japanese, 衛星通信研究会（SAT）, Domestic conference
18 Aug. 2016 - 光空間通信における物理レイヤ暗号～実用化への課題と今後の展望～
遠藤寛之; 藤原幹生; 北村光雄; 伊藤寿之; 豊嶋守生; 竹中秀樹; 清水亮介; 青木隆朗; 佐々木雅英
Oral presentation, Japanese, 衛星通信研究会（SAT）, Invited, Domestic conference
18 Aug. 2016 - Secret key agreement demonstration over 7.8 km free-space optical channel
Mikio Fujiwara; Toshiyuki Ito; Mitsuo Kitamura; Hiroyuki Endo; Morio Toyoshima; Hideki Takenaka; Yoshihisa Takayama; Ryosuke Shimizu; Masahiro Takeoka; Ryutaroh Matsumoto; Masahide Sasaki
Poster presentation, English, 13th International Conference on Quantum Communication, Measurement and Computing (QCMC2016), International conference
Jul. 2016 - Detection-dependent six-photon NOON state interference
Rui-Bo Jin; Mikio Fujiwara; Ryosuke Shimizu; Robert Collins; Gerald Buller; Taro Yamashita; Shigehito Miki; Hirotaka Terai; Masahiro Takeoka; Masahide Sasaki
Poster presentation, English, 13th International Conference on Quantum Communication, Measurement and Computing (QCMC2016), International conference
Jul. 2016 - 光子の周波数相関制御と時間分布計測
清水亮介
Public discourse, Japanese, 第124回KARCコロキウム, Invited, Domestic conference
08 Jun. 2016 - 周波数量子もつれ光子の二光子時間分布計測
清水亮介; 齊藤拓真
Oral presentation, Japanese, 日本物理学会 第71回年次大会, Domestic conference
21 Mar. 2016 - 周波数量子もつれ光子の二光子スペクトル-位相制御技術の開発
椎名良治; 清水亮介
Oral presentation, Japanese, 日本物理学会 第71回年次大会, Domestic conference
21 Mar. 2016 - CuCl単結晶から生成された光子対の単一モードファイバへの結合
宇野諒; 杉村優; 菅原雅弘; 橋本優吾; 宮島顕祐; 清水亮介
Oral presentation, Japanese, 日本物理学会 第71回年次大会, Domestic conference
21 Mar. 2016 - 光空間通信の物理レイヤセキュリティ技術
遠藤寛之; 藤原幹生; 北村光雄; 伊藤寿之; 豊嶋守生; 竹中秀樹; 清水亮介; 青木隆朗; 佐々木雅英
Oral presentation, Japanese, 衛星通信研究会（SAT）, Domestic conference
16 Feb. 2016 - 量子もつれ光子のフーリエ光学
清水亮介
Public discourse, Japanese, 第２８回先端光量子科学アライアンスセミナー, Invited, Domestic conference
18 Nov. 2015 - 量子もつれ光子波束の時間領域計測
清水亮介
Invited oral presentation, Japanese, 「新しい光科学の創成とナノ情報デバイスへの展開III」研究会, Domestic conference
Oct. 2015 - 極微弱光領域のフォトニクス-量子もつれ光子のフーリエ二重性-
清水亮介
Public discourse, Japanese, 光応用工学特別研究会, Invited, Domestic conference
09 Jun. 2015 - 低複屈折分極反転デバイスによる量子もつれ光子生成
清水亮介
Invited oral presentation, Japanese, 第62回応用物理学会春季学術講演会, Invited, Domestic conference
12 Mar. 2015 - 周波数量子もつれ光子のフーリエ二重性
齊藤拓真; 清水亮介
Oral presentation, Japanese, 第25回光物性研究会, Domestic conference
Dec. 2014 - アップコンバージョン法を用いた超高速単一光子検出システムの開発
齊藤拓真; 清水亮介
Oral presentation, Japanese, 日本物理学会2014秋季大会, Domestic conference
Sep. 2014 - Recent progress of photon pair generation and detection at telecom wavelength
Ryosuke Shimizu
Oral presentation, English, 第3回量子ICTフォーラム, Invited, Domestic conference
Jun. 2014 - Broadband polarization entangled photon pair generation in type-II parametric down-conversion
Nandan Singh; Ryosuke Shimizu
Oral presentation, English, 第６１回応用物理学会春期学術講演会, Domestic conference
Mar. 2014 - Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength
Rui-Bo Jin; Ryosuke Shimizu; Kentaro Wakui; Mikio Fujiwara; Taro Yamashita; Shigehito Miki; Hirotaka Terai; Zhen Wang; Madahide Sasaki
Oral presentation, English, 第６１回応用物理学会春期学術講演会, Domestic conference
Mar. 2014 - アップコンバージョン法による単一光子時間分解計測装置の開発
齊藤拓真; 清水亮介
Poster presentation, Japanese, 第24回光物性研究会, Domestic conference
Dec. 2013 - 光の粒で情報を伝える：光子を使った量子情報通信技術
清水亮介
Invited oral presentation, Japanese, Symposium on New Frontiers of Quantum Photonic Network, International conference
Nov. 2013 - Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength
Rui-Bo Jin; Ryosuke Shimizu; Kentaro Wakui; Mikio Fujiwara; Taro Yamashita; Shigehito Miki; Hirotaka Terai; Zhen Wang; Masahide Sasaki
Oral presentation, English, 第29回量子情報技術研究会 (QIT29), Domestic conference
Nov. 2013 - Nonclassical interference between independent intrinsically pure single photons at telecom wavelength
R.-B. Jin; K. Wakui; R. Shimizu; H. Benichi; S. Miki; T. Yamashita; H. Terai; Z. Wang; M. Fujiwara; M. Sasaki
Oral presentation, English, Single Photon Workshop 2013, International conference
Oct. 2013 - 通信波長帯における主は数無相関光子対の直接生成と多光子干渉実験
清水亮介
Oral presentation, Japanese, 第７４回応用物理学会秋季学術講演会, Domestic conference
Sep. 2013 - 通信波長帯における独立した光子間での二光子干渉実験
清水亮介; 金鋭博; 和久井健太郎; Hugo Benichi; 三木茂人; 山下太郎; 寺井弘高; 王鎮; 藤原幹生; 佐々木雅英
Oral presentation, Japanese, 日本物理学会2013年秋季大会, Domestic conference
Sep. 2013 - Nonclasscial interference between independent photon sources at telecom wavelength with widely tunable, spectrally highly pure single photon sources
R.-B. Jin; K. Wakui; R. Shimizu; H. Benichi; S. Miki; T. Yamashita; H. Terai; Z. Wang; M. Fujiwara; M. Sasaki
Poster presentation, English, The international workshop on new science and technologies using entangled photons, International conference
Jul. 2013 - Nonclasscial Interference between Independent Photon Sources at Telecom Wavelength with Superconducting Nanowire Single-Photon Detectors
R.-B. Jin; K. Wakui; R. Shimizu; H. Benichi; S. Miki; T. Yamashita; H. Terai; Z. Wang; M. Fujiwara; M. Sasaki
Oral presentation, English, The 12th Asia Pacific Physics Conference (APPC12), International conference
Jul. 2013 - Widely-tunable, spectrally pure, high effcient photon pairs generation at telecom wavelength
R.-B. Jin; R. Shimizu; K. Wakui; H. Benichi; M. Sasaki
Poster presentation, English, CLEO/Europe-EQEC 2013, International conference
May 2013 - Control of frequency correlations between photons
R. Shimizu
Public discourse, English, Qulink Seminar, Invited, International conference
Apr. 2013 - 量子もつれ光子の光科学
清水亮介
Public discourse, Japanese, 第１６回先端光量子科学アライアンスセミナー, Invited, Domestic conference
Nov. 2012 - 周波数無相関2光子状態の直接生成と4光子量子干渉
清水亮介
Nominated symposium, Japanese, 分子研研究会「新しい光の創成と物質科学－精密計測と操作への展開」, Invited, Domestic conference
Nov. 2012 - 光子数分解分光計測から見る量子もつれ光子
清水亮介
Invited oral presentation, Japanese, 量子エレクトロニクス研究会, Invited, Domestic conference
Dec. 2011 - 光計測技術への応用に向けた周波数量子もつれ状態の制御
清水亮介
Invited oral presentation, Japanese, 第58回応用物理学関係連合講演会, Invited, Domestic conference
Aug. 2011 - 多光子波束による物質の非線形光学応答
清水亮介
Invited oral presentation, Japanese, 第58回応用物理学関係連合講演会, Invited, Domestic conference
Mar. 2011
Courses
- 物理学概論第一
Apr. 2024 - Present
電気通信大学 - 量子情報光学特論
Present
The University of Electro-Communications - 物理工学実験第二
Present
The University of Electro-Communications - 量子エレクトロニクス
Present
電気通信大学 - 学域特別講義A（3大学協働基礎ゼミ’２４）
Jul. 2024 - Sep. 2024 - 物理工学特論
The University of Electro-Communications - 物理工学特論
電気通信大学 - 特別講義第四
山梨大学 - 特別講義第四
山梨大学 - Graduate Technical English
The University of Electro-Communications - 大学院技術英語
電気通信大学 - Physics Ⅰ
The University of Electro-Communications - 量子情報光学特論
電気通信大学 - 量子情報光学特論
The University of Electro-Communications - 応用物理工学実験第二
The University of Electro-Communications - 量子エレクトロニクス
The University of Electro-Communications - 量子エレクトロニクス
電気通信大学 - 応用物理工学実験第二
The University of Electro-Communications - 応用物理工学実験第二
電気通信大学 - 量子エレクトロニクス
The University of Electro-Communications
Affiliated academic society
Research Themes
- 高次元フーリエ操作による時間ー周波数量子もつれ光変調技術の開発とその応用
清水 亮介
日本学術振興会, 科学研究費助成事業, 電気通信大学, 基盤研究(B), 24K01379
01 Apr. 2024 - 31 Mar. 2028 - 複雑分子系としての光合成機能の解明に向けた多次元量子もつれ分光技術の開発
文部科学省, 光・量子飛躍フラッグシッププログラム(Q-LEAP), 電気通信大学, Principal investigator, JPMXS0118069242
Nov. 2018 - Mar. 2028 - 多光子波束による物質の非線形光学応答
清水 亮介
科学技術振興機構, 戦略的な研究開発の推進 戦略的創造研究推進事業 さきがけ, 科学技術振興機構, Principal investigator, 光の量子性が顕著になる極微弱光領域における光と物質の相互作用では多光子波束の量子的な内部自由度が重要な役割を果たします。本研究では時間ー周波数領域における多光子波束の内部自由度を制御する手法の開拓を行い、その非線形光学応答を実験的に調べます。これにより、量子レベルの光と物質との非線形光学応答では相互作用を強く起こしたい場合と、時間応答を調べたい場合とで最適な光の状態が異なることを明らかにします。
2007 - 2010
Industrial Property Rights
- GENERATOR OF POLARIZATION ENTANGLED PHOTON PAIRS AND METHOD OF GENERATING THE SAME
Patent right, Ryosuke Shimizu, Keiichi Edamatsu, PCT/JP2010/059461, EP 2,439,585, Date issued: 30 Apr. 2014 - GENERATOR OF POLARIZATION ENTANGLED PHOTON PAIRS AND METHOD OF GENERATING THE SAME
Patent right, Ryosuke Shimizu, Keiichi Edamatsu, PCT/JP2010/059461, US 8,488,231, Date issued: 16 Jul. 2013 - 偏光量子もつれ光子対の生成装置及びその生成方法
Patent right, 清水亮介, 枝松圭一, -, 特許第5099393号, Date issued: 05 Oct. 2012 - NON-DEGENERATE POLARIZATION-ENTANGLED PHOTON PAIR GENERATION DEVICE AND NON-DEGENERATE POLARIZATION-ENTANGLED PHOTON PAIR GENERATION METHOD
Patent right, Ryosuke Shimizu, Keiichi Edamatsu, Shigehiro Nagano, PCT/JP2008/072441, US 8,173,982, Date issued: 08 May 2012 - 量子もつれ光子対生成装置，及び，量子もつれ光子対生成方法
Patent right, -, 清水亮介、枝松圭一, 特許第4781426号, Date issued: 15 Jul. 2011 - 光学非線形性評価装置及び光スイッチング素子
Patent right, 清水亮介, 枝松圭一, 松田信幸, -, 特許第4627549号, Date issued: 19 Nov. 2010 - NON-DEGENERATE POLARIZATION-ENTANGLED PHOTON PAIR GENERATION DEVICE AND NON-DEGENERATE POLARIZATION-ENTANGLED PHOTON PAIR GENERATION METHOD
Patent right, Ryosuke Shimizu, Shigehiro Nagano, Keiichi Edamatsu, PCT/JP2008/072441, EP 2,233,971, Date issued: 29 Sep. 2010 - OPTICAL NONLINEAR EVALUATION DEVICE AND OPTICAL SWITCHING ELEMENT
Patent right, Ryosuke Shimizu, Keiichi Edamatsu, Nobuyuki Matsuda, -, US 7,652,770, Date issued: 26 Jan. 2010 - QUANTUM ENTANGLEMENT PHOTON-PAIR PRODUCING DEVICE AND QUANTUM ENTANGLEMENT PHOTON PAIR PRODUCING METHOD
Patent right, Ryosuke Shimizu, Keiichi Edamatsu, -, US 7,570,419, Date issued: 04 Aug. 2009