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Okamoto, Ryo

Graduate School of Engineering, Division of Electronic Science and Engineering Associate Professor

Okamoto, Ryo
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    Last Updated :2022/10/05

    Basic Information

    Faculty

    • 工学部

    Academic Degree

    • 修士(工学)(北海道大学)
    • 博士(工学)(北海道大学)

    Research History

    • From 2009
      Hokkaido University, Research Institute for Electronic Science, 助教

    Profile

    • Profile

      Quantum optics experimentalist interested in quantum metrology, quantum measurement and quantum computing.

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    researchmap URL

    list
      Last Updated :2022/10/05

      Research

      Research Interests

      • 量子メトロロジー
      • 量子コンピュータ
      • 量子光学
      • 量子情報処理プロジェクト

      Research Areas

      • Natural sciences, Semiconductors, optical and atomic physics

      Papers

      • Roadmap of incoherent digital holography
        Tatsuki Tahara; Yaping Zhang; Joseph Rosen; Vijayakumar Anand; Liangcai Cao; Jiachen Wu; Takako Koujin; Atsushi Matsuda; Ayumi Ishii; Yuichi Kozawa; Ryo Okamoto; Ryutaro Oi; Teruyoshi Nobukawa; Kihong Choi; Masatoshi Imbe; Ting-Chung Poon
        Applied Physics B, Nov. 2022
      • High-depth-resolution imaging of dispersive samples using quantum optical coherence tomography
        Kyohei Hayama; Bo Cao; Ryo Okamoto; Shun Suezawa; Masayuki Okano; Shigeki Takeuchi
        Optics Letters, 01 Oct. 2022
      • Wavelength-Tunable Quantum Absorption Spectroscopy in the Broadband Midinfrared Region
        Masaya Arahata; Yu Mukai; Toshiyuki Tashima; Ryo Okamoto; Shigeki Takeuchi
        Physical Review Applied, 07 Sep. 2022
      • Quantum Fourier-transform infrared spectroscopy in the fingerprint region
        Yu Mukai; Ryo Okamoto; Shigeki Takeuchi
        Optics Express, 20 Jun. 2022
      • Phase-shifting interferometry for multidimensional incoherent digital holography and toward ultimately low light sensing
        Tatsuki Tahara; Ryo Okamoto; Ayumi Ishii; Yuichi Kozawa; Takako Koujin; Atsushi Matsuda; Ryutaro Oi
        Proceedings of SPIE - The International Society for Optical Engineering, 2021
      • Precision limit for simultaneous phase and transmittance estimation with phase-shifting interferometry
        Ryo Okamoto; Tatsuki Tahara
        Physical Review A, Sep. 2021
      • 17aAC-6 Realization of 3μm-resolution quantum optical coherence tomography
        Suezawa Shun; Nagamatsu Yuichi; Okano Masayuki; Okamoto Ryo; Nishizawa Norihiko; Takeuchi Shigeki
        Meeting Abstracts of the Physical Society of Japan, 2015
      • 17pAC-1 Two-photon interference using a photon number controlled multiplexed single photon source
        Kiyohara T.; Okamoto R.; Takeuchi S.
        Meeting Abstracts of the Physical Society of Japan, 2015
      • 17aAC-5 Study on the dispersion control of frequency entangled photon pairs to minimize temporal correlation
        Sugano S.; Okano M.; Eto Y.; Okamoto R.; Takeuchi S.
        Meeting Abstracts of the Physical Society of Japan, 2015
      • Efficient generation of ultra-broadband parametric fluorescence using chirped quasi-phase-matched waveguide devices
        Bo Cao; Mamoru Hisamitsu; Katsuhiko Tokuda; Sunao Kurimura; Ryo Okamoto; Shigeki Takeuchi
        Optics Express, 05 Jul. 2021
      • Wavelength variable generation and detection of photon pairs in visible and mid-infrared regions via spontaneous parametric downconversion
        Masaya Arahata; Yu Mukai; Bo Cao; Toshiyuki Tashima; Ryo Okamoto; Shigeki Takeuchi
        Journal of the Optical Society of America B, 01 Jun. 2021
      • Quantum Fourier-Transform Infrared Spectroscopy for Complex Transmittance Measurements
        Y. Mukai; M. Arahata; T. Tashima; R. Okamoto; S. Takeuchi
        Physical Review Applied, 08 Mar. 2021
      • Frequency correlated photon generation at telecom band using silicon nitride ring cavities
        YIN, Z.; SUGIURA, K.; TAKASHIMA, H.; OKAMOTO, R.; QIU, F.; YOKOYAMA, S.; TAKEUCHI, S.
        Optics Express, 2021
      • Broadband generation of photon-pairs from a CMOS compatible device
        K. Sugiura; Z. Yin; R. Okamoto; L. Zhang; L. Kang; J. Chen; P. Wu; S. T. Chu; B. E. Little; S. Takeuchi
        Applied Physics Letters, 01 Jun. 2020, Peer-reviewed
      • Multidimensional digital holographic microscopy based on computational coherent superposition for coherent and incoherent light sensing
        Tatsuki Tahara; Ryo Okamoto; Ayumi Ishii; Tomoyoshi Ito; Koki Wakunami; Yasuyuki Ichihashi; Ryutaro Oi
        Proceedings of SPIE - The International Society for Optical Engineering, 2020
      • Adaptive quantum state estimation for dynamic quantum states
        Nohara, S.; Okamoto, R.; Fujiwara, A.; Takeuchi, S.
        Physical Review A, 2020
      • Direct and efficient verification of entanglement between two multimode-multiphoton systems
        Kiyohara, T.; Yamashiro, N.; Okamoto, R.; Araki, H.; Wu, J.-Y.; Hofmann, H.F.; Takeuchi, S.
        Optica, 2020
      • Loss tolerant quantum absorption measurement
        Okamoto, R.; Tokami, Y.; Takeuchi, S.
        New Journal of Physics, 2020
      • Unified integration scheme using an N×N active switch for efficient generation of a multi-photon parallel state
        Kiyohara, T.; Okamoto, R.; Takeuchi, S.
        Optics Express, 2020, Peer-reviewed
      • An on-chip photon-pair source with negligible two-photon absoprtion
        Sugiura, K.; Okamoto, R.; Zhang, L.; Kang, L.; Chen, J.; Wu, P.; Chu, S.T.; Little, B.E.; Takeuchi, S.
        Applied Physics Express, 2019, Peer-reviewed
      • Realization of high-speed adaptive quantum state estimation
        Nohara, S.; Okamoto, R.; Yamagata, K.; Fujiwara, A.; Takeuchi, S.
        Japanese Journal of Applied Physics, 2019, Peer-reviewed
      • Color single-pixel digital holography with a phase-encoded reference wave
        Endo, Y.; Tahara, T.; Okamoto, R.
        Applied Optics, 2019
      • Nonlocal Position Changes of a Photon Revealed by Quantum Routers
        Elitzur, A.C.; Cohen, E.; Okamoto, R.; Takeuchi, S.
        Scientific Reports, 2018, Peer-reviewed
      • Consistent and Efficient Nonparametric Different-Feature Selection
        Satoshi Hara; Takayuki Katsuki; Hiroki Yanagisawa; Takafumi Ono; Ryo Okamoto; Shigeki Takeuchi
        ARTIFICIAL INTELLIGENCE AND STATISTICS, VOL 54, 2017
      • Serial-parallel conversion for single photons with heralding signals
        Kiyohara, T.; Okamoto, R.; Takeuchi, S.
        Optics Express, 2017, Peer-reviewed
      • Experimental demonstration of adaptive quantum state estimation for single photonic qubits
        Okamoto, R.; Oyama, S.; Yamagata, K.; Fujiwara, A.; Takeuchi, S.
        Physical Review A, 2017
      • Implementation of a quantum controlled-SWAP gate with photonic circuits
        Ono, T.; Okamoto, R.; Tanida, M.; Hofmann, H.F.; Takeuchi, S.
        Scientific Reports, 2017, Peer-reviewed
      • Study on the dispersion control of broadband frequency entangled photon pairs to minimize the temporal correlation
        Deguchi Tatsuki; Sugano Shunta; Okamoto Ryo; Takeuchi Shigeki
        Meeting Abstracts of the Physical Society of Japan, 2016
      • Quantum-state anomaly detection for arbitrary errors using a machine-learning technique
        Hara, S.; Ono, T.; Okamoto, R.; Washio, T.; Takeuchi, S.
        Physical Review A, 2016
      • Experimental demonstration of a quantum shutter closing two slits simultaneously
        Okamoto, R.; Takeuchi, S.
        Scientific Reports, 2016, Peer-reviewed
      • Realization of multiplexing of heralded single photon sources using photon number resolving detectors
        Kiyohara, T.; Okamoto, R.; Takeuchi, S.
        Optics Express, 2016, Peer-reviewed
      • 23pAN-13 Implementation of a controlled SWAP gate with photonic circuits
        Ono T.; Tanida M.; Okamoto R.; Hofmann Holger F.; Takeuchi S.
        Meeting Abstracts of the Physical Society of Japan, 2015
      • 23pAN-11 Toward realization of the on-chip photon pair source in Si_3N_4 waveguide
        Sagawa Tatsurou; Okamoto Ryo; Okano Masayuki; Takashima Hideaki; Ishino Masaaki; Qiu Feng; Yokoyama Shiyoshi; Takeuchi Shigeki
        Meeting Abstracts of the Physical Society of Japan, 2015
      • 0.54 μm resolution two-photon interference with dispersion cancellation for quantum optical coherence tomography
        Okano, M.; Lim, H.H.; Okamoto, R.; Nishizawa, N.; Kurimura, S.; Takeuchi, S.
        Scientific Reports, 2015, Peer-reviewed
      • Anomaly detection in reconstructed quantum states using a machine-learning technique
        Hara, S.; Ono, T.; Okamoto, R.; Washio, T.; Takeuchi, S.
        Physical Review A - Atomic, Molecular, and Optical Physics, 2014
      • Scalable spatial superresolution using entangled photons
        Rozema, L.A.; Bateman, J.D.; Mahler, D.H.; Okamoto, R.; Feizpour, A.; Hayat, A.; Steinberg, A.M.
        Physical Review Letters, 2014, Peer-reviewed
      • Investigation of the performance of an ultralow-dark-count superconducting nanowire single-photon detector
        Subashchandran, S.; Okamoto, R.; Zhang, L.; Tanaka, A.; Okano, M.; Kang, L.; Chen, J.; Wu, P.; Takeuchi, S.
        Japanese Journal of Applied Physics, 2013
      • Dispersion cancellation in high-resolution two-photon interference
        Okano, M.; Okamoto, R.; Tanaka, A.; Ishida, S.; Nishizawa, N.; Takeuchi, S.
        Physical Review A - Atomic, Molecular, and Optical Physics, 2013
      • An entanglement-enhanced microscope
        Ono, T.; Okamoto, R.; Takeuchi, S.
        Nature Communications, 2013, Peer-reviewed
      • Experimental Demonstration of Adaptive Quantum State Estimation
        Ryo Okamoto; Minako Iefuji; Satoshi Oyama; Koichi Yamagata; Hiroshi Imai; Akio Fujiwara; Shigeki Takeuchi
        2013 CONFERENCE ON AND INTERNATIONAL QUANTUM ELECTRONICS CONFERENCE LASERS AND ELECTRO-OPTICS EUROPE (CLEO EUROPE/IQEC), 2013, Peer-reviewed
      • Sum-Frequency-Photon Generation From an Entangled Photon Pair
        Yu Eto; Masayuki Okano; Akira Tanaka; Shanthi Subashchandran; Ryo Okamoto; Hwan Hong Lim; Sunao Kurimura; Shigeki Takeuchi
        2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR), 2013, Peer-reviewed
      • Broadband Frequency Correlated Photon Pairs Using a Chirped-QPM Device
        Akira Tanaka; Ryo Okamoto; Hwan Hong Lim; Shanthi Subashchandran; Masayuki Okano; Labao Zhang; Lin Kang; Jian Chen; Peiheng Wu; Toru Hirohata; Sunao Kurimura; Shigeki Takeuchi
        2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR), 2013, Peer-reviewed
      • Adaptive Quantum State Estimation of Mixed States Using Photons
        Satoshi Oyama; Minako Iefuji; Ryo Okamoto; Koichi Yamagata; Akio Fujiwara; Shigeki Takeuchi
        2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR), 2013, Peer-reviewed
      • High-resolution Quantum Optical Coherence Tomography by Broadband Parametric Fluorescence
        Masayuki Okano; Ryo Okamoto; Akira Tanaka; Shutaro Ishida; Norihiko Nishizawa; Shigeki Takeuchi
        2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR), 2013, Peer-reviewed
      • Generation of broadband spontaneous parametric fluorescence using multiple bulk nonlinear crystals
        Okano, M.; Okamoto, R.; Tanaka, A.; Subashchandran, S.; Takeuchi, S.
        Optics Express, 2012, Peer-reviewed
      • Highly indistinguishable heralded single-photon sources using parametric down conversion
        Tanida, M.; Okamoto, R.; Takeuchi, S.
        Optics Express, 2012, Peer-reviewed
      • Experimental demonstration of adaptive quantum state estimation
        Okamoto, R.; Iefuji, M.; Oyama, S.; Yamagata, K.; Imai, H.; Fujiwara, A.; Takeuchi, S.
        Physical Review Letters, 2012, Peer-reviewed
      • Noncollinear parametric fluorescence by chirped quasi-phase matching for monocycle temporal entanglement
        Tanaka, A.; Okamoto, R.; Lim, H.H.; Subashchandran, S.; Okano, M.; Zhang, L.; Kang, L.; Chen, J.; Wu, P.; Hirohata, T.; Kurimura, S.; Takeuchi, S.
        Optics Express, 2012, Peer-reviewed
      • Spectral dependence of ultra-low dark count Superconducting single photon detector for the evaluation of broadband parametric fluorescence
        Shanthi Subashchandran; Ryo Okamoto; Akira Tanaka; Masayuki Okano; Labao Zhang; Lin Kang; Jian Chen; Peiheng Wu; Shigeki Takeuchi
        QUANTUM SENSING AND NANOPHOTONIC DEVICES IX, 2012, Peer-reviewed
      • Quantum lithography under imperfect conditions: Effects of loss and dephasing on two-photon interference fringes
        Fujiwara, H.; Kawabe, Y.; Okamoto, R.; Takeuchi, S.; Sasaki, K.
        Journal of the Optical Society of America B: Optical Physics, 2011, Peer-reviewed
      • Realization of a knill-laflamme-milburn controlled-NOT photonic quantum circuit combining effective optical nonlinearities
        Okamoto, R.; O'Brien, J.L.; Hofmann, H.F.; Takeuchi, S.
        Proceedings of the National Academy of Sciences of the United States of America, 2011, Peer-reviewed
      • Phase shift spectra of a fiber-microsphere system at the single photon level
        Tanaka, A.; Asai, T.; Toubaru, K.; Takashima, H.; Fujiwara, M.; Okamoto, R.; Takeuchi, S.
        Optics Express, 2011, Peer-reviewed
      • Optical quantum circuit combining tailored optical nonlinearities
        Shigeki Takeuchi; Ryo Okamoto; Masazumi Fujiwara; Hong-Quan Zhao; Holger F. Hofmann; Jeremy L. O'Brien
        2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011, 2011, Peer-reviewed
      • Collinear ultra-broadband parametric fluorescence generated from 10%-chirped quasi phase matched device
        Akira Tanaka; Ryo Okamoto; Hwan Hong Lim; Shanthi Subashchandran; Masayuki Okano; Sunao Kurimura; Shigeki Takeuchi
        2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011, 2011, Peer-reviewed
      • Generation of broadband spontaneous parametric fluorescence and its application to quantum optical coherence tomography
        Masayuki Okano; Ryo Okamoto; Akira Tanaka; Shanthi Subashchandran; Shutaro Ishida; Norihiko Nishizawa; Shigeki Takeuchi
        QUANTUM COMMUNICATIONS AND QUANTUM IMAGING IX, 2011, Peer-reviewed
      • Analysis of experimental error sources in a linear-optics quantum gate
        Nagata, T.; Okamoto, R.; Hofmann, H.F.; Takeuchi, S.
        New Journal of Physics, 2010, Peer-reviewed
      • How can we minimize erros in a linear-optics quantum gate?
        Tomohisa Nagata; Ryo Okamoto; Masato Tanida; Holger F. Hofmann; Shigeki Takeuchi
        QUANTUM COMMUNICATIONS AND QUANTUM IMAGING VIII, 2010, Peer-reviewed
      • An entanglement filter
        Okamoto, R.; O'Brien, J.L.; Hofmann, H.F.; Nagata, T.; Sasaki, K.; Takeuchi, S.
        Science, 2009, Peer-reviewed
      • Analysis of errors in an optical controlled-NOT gate
        Tomohisa Nagata; Ryo Okamoto; Keiji Sasaki; Shigeki Takeuchi
        Proceedings of SPIE - The International Society for Optical Engineering, 2009, Peer-reviewed
      • Beating the standard quantum limit: Phase super-sensitivity of N-photon interferometers
        Okamoto, R.; Hofmann, H.F.; Nagata, T.; O'Brien, J.L.; Sasaki, K.; Takeuchi, S.
        New Journal of Physics, 2008, Peer-reviewed
      • Beating the standard quantum limit with four-entangled photons
        Nagata, T.; Okamoto, R.; O'Brien, J.L.; Sasaki, K.; Takeuchi, S.
        Science, 2007, Peer-reviewed
      • Quantum interference fringes beating the diffraction limit
        Kawabe, Y.; Fujiwara, H.; Okamoto, R.; Sasaki, K.; Takeuchi, S.
        Optics Express, 2007, Peer-reviewed
      • Tailoring two-photon interference with phase dispersion
        Okamoto, R.; Takeuchi, S.; Sasaki, K.
        Physical Review A - Atomic, Molecular, and Optical Physics, 2006, Peer-reviewed
      • Analysis of an experimental quantum logic gate by complementary classical operations
        Hofmann, H.F.; Okamoto, R.; Takeuchi, S.
        Modern Physics Letters A, 2006, Peer-reviewed
      • Detailed analysis of a single-photon source using gated spontaneous parametric downconversion
        Okamoto, R.; Takeuchi, S.; Sasaki, K.
        Journal of the Optical Society of America B: Optical Physics, 2005, Peer-reviewed
      • Demonstration of an optical quantum controlled-NOT gate without path interference
        Okamoto, R.; Hofmann, H.F.; Takeuchi, S.; Sasaki, K.
        Physical Review Letters, 2005, Peer-reviewed
      • Demonstration of controlled-NOT gate using linear optics
        Ryo Okamoto; Holger F. Hofmann; Shigeki Takeuchi; Keiji Sasaki
        IQEC, International Quantum Electronics Conference Proceedings, 2005, Peer-reviewed
      • High-yield single-photon source using gated spontaneous parametric downconversion
        S Takeuchi; R Okamoto; K Sasaki
        APPLIED OPTICS, Oct. 2004, Peer-reviewed
      • High-yield single-photon source using gated spontaneous parametric downconversion
        Takeuchi, S.; Okamoto, R.; Sasaki, K.
        Applied Optics, 2004, Peer-reviewed
      • Single photon source using parametric down conversion
        S Takeuchi; R Okamoto; K Sasaki
        QUANTUM COMMUNICATIONS AND QUANTUM IMAGING, 2004, Peer-reviewed

      Misc.

      • 23pED-4 Development of superconducting nanowire single photon detection system for the evaluation of ultra broadband parametric fluorescence
        SubashChandran Shanthi; Okamoto Ryo; Tanaka Akira; Okano Masayuki; Zhang Labao; Kang Lin; Chen Jian; Wu Peiheng; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 24 Aug. 2011
      • 量子もつれ光の光計測への応用 (特集 量子光工学)
        岡本 亮; 岡野 真之; 竹内 繁樹
        O plus E : Optics・Electronics, Sep. 2015
      • Ultrahigh-Resolution Optical Coherence Tomography Using Quantum Entangled Photon Pairs
        岡野 真之; 岡本 亮; 竹内 繁樹
        レーザー研究 = The review of laser engineering : レーザー学会誌, Oct. 2016
      • An entanglement-enhanced microscope
        竹内 繁樹; 小野 貴史; 岡本 亮
        応用物理, Aug. 2015
      • BCI-2-3 Optical phase measurement beating standard quantum limit using entangled photons
        Okamoto Ryo; Takeuchi Shigeki
        Proceedings of the Society Conference of IEICE, 09 Sep. 2014
      • Narrow two-photon interference of broadband spontaneous parametric fluorescence generated from chirped PPSLT devices
        Masayuki Okano; Ryo Okamoto; Norihiko Nishizawa; Hwan Hong Lim; Sunao Kurimura; Shigeki Takeuchi
        Meeting abstracts of the Physical Society of Japan, Aug. 2014
      • 30aCC-8 Adaptive Quantum State Estimation for Single Quantum Bit
        Oyama Satoshi; Okamoto Ryo; Ono Takafumi; Takeuchi Shigeki; Yamagata Koichi; Fujiwara Akio
        Meeting abstracts of the Physical Society of Japan, 05 Mar. 2014
      • Optical Phase Measurement Using Entangled Photons
        OKAMOTO Ryo; TAKEUCHI Shigeki
        光学, 10 Oct. 2013
      • Quantum state data mining
        Ono Takafumi; Okamoto Ryo; Takeuchi Shigeki; Hara Satoshi; Washio Takashi
        Meeting abstracts of the Physical Society of Japan, 26 Aug. 2013
      • パラメトリック蛍光光子対からの和周波光子発生実験
        江藤祐; 岡野真之; 田中陽; 岡本亮; LIM Hwan Hong; 栗村直; 竹内繁樹
        日本物理学会講演概要集, Aug. 2013
      • 量子もつれ光子対生成レートの2光子量子干渉への影響
        岡野真之; 横井宇慧; 田中陽; 岡本亮; 竹内繁樹
        日本物理学会講演概要集, Aug. 2013
      • 光子を用いた量子測定実験 (量子論における統計的推測の理論と応用)
        岡本 亮
        数理解析研究所講究録, May 2013
      • Spectral properties of ultra-broadband entangled photons generated from chirped-MgSLT crystal towards monocycle entanglement generation
        Akira Tanaka; Ryo Okamoto; Hwan Hong Lim; Shanthi Subashchandran; Masayuki Okano; Labao Zhang; Lin Kang; Jian Chen; Peiheng Wu; Toru Hirohata; Sunao Kurimura; Shigeki Takeuchi
        Proceedings of SPIE, Mar. 2013
      • Error analysis of optical quantum circuits consisting of multiple quantum gates
        谷田 真人; 小野 貴史; 岡本 亮
        量子情報技術研究会資料, 27 Nov. 2012
      • Demonstration of the dispersion-tolerant quantum optical coherence tomography by broadband parametric fluorescence
        岡野 真之; 岡本 亮; 田中 陽
        量子情報技術研究会資料, 27 Nov. 2012
      • Toward the realization of monocycle entangled photons : a new field of optical quantum science using quasi phase matched devices
        竹内 繁樹; 岡本 亮; 岡野 真之
        オプトロニクス, Nov. 2012
      • 19aAK-9 Adaptive Measurement for Quantum Phase Estimation II
        Oyama Satoshi; Iefuji Minako; Okamoto Ryo; Yamagata Koichi; Fujiwara Akio; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 24 Aug. 2012
      • 19aAK-8 Experimental demonstration of an entanglement microscope
        Ono Takafumi; Okamoto Ryo; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 24 Aug. 2012
      • 19pAK-4 Narrow two-photon interference signals and effects of high order dispersion toward quantum optical coherence tomography
        Okano Masayuki; Okamoto Ryo; Tanaka Akira; Subashchandran Shanthi; Ishida Shutaro; Nishizawa Norihiko; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 24 Aug. 2012
      • 19pAK-5 Measurement of the frequency correlation of broadband parametric fluorescence generated from chirped-PPSLT device
        Tanaka Akira; Okamoto Ryo; Lim Hwan Hong; Okano Masayuki; Subashchandran Shanthi; Kurimura Sunao; Zhang Labao; Kang Lin; Chen Jian; Wu Peiheng; Hirohata Toru; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 24 Aug. 2012
      • Dispersion-tolerant quantum optical coherence tomography by broadband spontaneous parametric fluorescence
        OKANO Masayuki; OKANO Masayuki; OKAMOTO Ryo; OKAMOTO Ryo; TANAKA Akira; TANAKA Akira; SUBASHCHANDRAN Shanthi; SUBASHCHANDRAN Shanthi; ISHIDA Shutaro; NISHIZAWA Norihiko; TAKEUCHI Shigeki; TAKEUCHI Shigeki
        Abstr RIES Hokudai Symp, 2012
      • 21aED-7 Realization of a Knill-Laflamme-Milbern controlled-NOT gate
        Okamoto Ryo; O'Brien Jeremy L; Hofmann Holger F; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 24 Aug. 2011
      • 21aED-8 Toward the realization of Quantum Controlled-SWAP operation using optical quantum circuit
        Tanida Masato; Okamoto Ryo; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 24 Aug. 2011
      • 22pEB-4 Adaptive Measurement for Quantum Phase Estimation
        Iefuji Minako; Okamoto Ryo; Yamagata Koichi; Imai Hiroshi; Fujiwara Akio; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 24 Aug. 2011
      • 23pED-3 Two-photon interference experiments of broadband spontaneous parametric fluorescence toward quantum optical coherence tomography
        Okano Masayuki; Okamoto Ryo; Tanaka Akira; Subashchandran Shanthi; Ishida Shutaro; Nishizawa Norihiko; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 24 Aug. 2011
      • 23pED-5 Evaluation of properties of broadband parametric fluorescence generated from chirped-PPSLT device II
        Tanaka Akira; Okamoto Ryo; Lim Hwan Hong; Okano Masayuki; Subashchandran Shanthi; Kurimura Sunao; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 24 Aug. 2011
      • 23pED-7 Comparison of the methods about optical phase measurement beating the standard quantum limit
        Ono Takafumi; Okamoto Ryo; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 24 Aug. 2011
      • 26pRB-1 Toward the realization of monocycle entangled photon pair sources
        Takeuchi Shigeki; Okamoto Ryo; Okano Masayuki; Subashchandran Shanthi; Tanaka Akira; Kurimura Sunao; Hofmann Holger F; Nishizawa Norihiko
        Meeting abstracts of the Physical Society of Japan, 03 Mar. 2011
      • 26pRB-2 Broadening of parametric fluorescence from BBO crystal
        Okamoto Ryo; Okano Masayuki; Tanaka Akira; Subashchandran Shanthi; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 03 Mar. 2011
      • 26pRB-3 Application of broadband parametric fluorescence to quantum optical coherence tomography
        Okano Masayuki; Okamoto Ryo; Tanaka Akira; Subashchandran Shanthi; Ishida Shutaro; Nishizawa Norihiko; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 03 Mar. 2011
      • 26pRB-4 Evaluation of properties of broadband parametric fluorescence generated from chirped-PPSLT device
        Tanaka Akira; Okamoto Ryo; Lim Hwan Hong; Okano Masayuki; Subashchandran Shanthi; Kurimura Sunao; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 03 Mar. 2011
      • 20pTD-9 Quantum Process Tomography of Microsphere Cavity-Coupled Tapered Fiber System at the Single Photon Level
        Tanaka Akira; Toubaru Kiyota; Fujiwara Masazumi; Okamoto Ryo; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 01 Mar. 2010
      • 21aTD-2 Realization of optical quantum gates based on two photon quantum interference and their evolution to optical quantum circuit
        Okamoto Ryo
        Meeting abstracts of the Physical Society of Japan, 01 Mar. 2010
      • 23pTB-1 Toward the realization of linear-optics quantum gates : significance and interactions of error sources
        Nagata T; Okamoto R; Hofmann Holger F; Takeuchi S
        Meeting abstracts of the Physical Society of Japan, 01 Mar. 2010
      • Realization of an optical quantum circuit : An entanglement filter
        TAKEUCHI Shigeki; OKAMOTO Ryo
        應用物理, 10 Feb. 2010
      • 25aZF-12 Realization of heralded single photon sources with single spatiotemporal mode
        Tanida Masato; Okamoto Ryo; Shi Jianhong; Kurimura Sunao; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 18 Aug. 2009
      • 25pZF-4 multi photon entangled state generation by reiterative use of gates
        Nagata Tomohisa; Okamoto Ryo; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 18 Aug. 2009
      • 26aZF-5 Experimental demonstration of an entanglement filter
        Okamoto Ryo; O'Brien Jeremy L; Hofmann Holger F; Nagata Tomohisa; Sasaki Keiji; Takeuchi Shigeki
        Meeting abstracts of the Physical Society of Japan, 18 Aug. 2009
      • 23pQD-4 Hong-Ou-Mandel dip with independent heralding single photon sources
        Tanida Masato; Okamoto Ryo; Nagata Tomohisa; Takeuchi Shigeki; Sasaki Keiji
        Meeting abstracts of the Physical Society of Japan, 29 Feb. 2008
      • 23pQD-3 Analysis of errors in an optical Controlled-NOT gate with a high-precision testing bed II
        Nagata Tomohisa; Okamoto Ryo; Hofmann Holger F; Takeuchi Shigeki; Sasaki Keiji
        Meeting abstracts of the Physical Society of Japan, 29 Feb. 2008
      • 24pRG-7 Verification of a non-local quantum filter
        Okamoto Ryo; O'Brien Jeremy; Hofmann Holger F; Nagata Tomohisa; Takeuchi Shigeki; Sasaki Keiji
        Meeting abstracts of the Physical Society of Japan, 21 Aug. 2007
      • 21pXK-4 Experimental demonstration of quantum lithography beyond diffraction limit II
        Kawabe Yoshio; Okamoto Ryo; Fujiwara Hideki; Takeuchi Shigeki; Sasaki Keiji
        Meeting abstracts of the Physical Society of Japan, 28 Feb. 2007
      • 21pXK-3 Phase measurement using multi photon interference and Standard Quantum Limit
        Okamoto Ryo; Nagata Tomohisa; O'Brien Jeremy; Takeuchi Shigeki; Sasaki Keiji
        Meeting abstracts of the Physical Society of Japan, 28 Feb. 2007
      • 21pXK-2 Testing the indistinguishability of 2 photon states using Hong-Ou-Mandel interference
        Nagata Tomohisa; Okamoto Ryo; Takeuchi Shigeki; Sasaki Keiji; O'Brien Jeremy
        Meeting abstracts of the Physical Society of Japan, 28 Feb. 2007
      • Analysis of errors in an optical Controlled-NOT gate with a high-precision testing bed
        Tomohisa Nagata; Ryo Okamoto; Holger F. Hofmann; Shigeki Takeuchi; Keiji Sasaki
        Conference on Lasers and Electro-Optics Europe - Technical Digest, 2007
      • Optical quantum controlled-NOT gate without path interference
        OKAMOTO Ryo
        應用物理, 10 Nov. 2006
      • 26aRB-11 The effect of frequency entanglement for Hong-Ou-Mandel interference
        Okamoto Ryo; Takeuchi Shigeki; Sasaki Keiji
        Meeting abstracts of the Physical Society of Japan, 18 Aug. 2006
      • 26aRB-10 Super Phase Resolution Measurement with Four Photons
        Nagata Tomohisa; Okamoto Ryo; Takeuchi Shigeki; Sasaki Keiji; O'Brien Jeremy
        Meeting abstracts of the Physical Society of Japan, 18 Aug. 2006
      • 25pXQ-9 A proposal of the new method to measure phase dispersion usign two photon interference of parametric fluorescence
        Okamoto Ryo; Takeuchi Shigeki; Sasaki Keiji
        Meeting abstracts of the Physical Society of Japan, 04 Mar. 2005
      • 14pTF-10 Analysis of unusual form of HOM-dip
        Okamoto Ryo; Takeuchi Shigeki; Sasaki Keiji
        Meeting abstracts of the Physical Society of Japan, 25 Aug. 2004
      • Realization of a single photon source using parametric fluorescence
        Okamoto Ryo; Takeuchi Shigeki; Sasaki Keiji
        Meeting abstracts of the Physical Society of Japan, 15 Aug. 2003
      • Single photon source us ins parametric fluorescence
        Okamoto Ryo; Takeuchi Shigeki; Sasaki Keiji
        Meeting abstracts of the Physical Society of Japan, 13 Aug. 2002
      • Photon number distribution of the outputs from a single photon source using parametric fluorescence
        Takeuchi Shigeki; Okamoto Ryo; Sasaki Keiji
        Meeting abstracts of the Physical Society of Japan, 03 Sep. 2001

      Awards

      • Feb. 2007
        井上科学振興財団, 第23回井上研究奨励賞
      • Mar. 2007
        北海道大学電子科学研究所, 松本・羽鳥奨学賞
      • Mar. 2019
        文部科学省, 文部科学大臣表彰 若手科学者賞
      • Feb. 2007
        一般財団法人丸文財団, 丸文研究奨励賞

      External funds: Kakenhi

      • 境界条件制御によって切り拓く量子ウォークの新たな応用
        Grant-in-Aid for Scientific Research (B)
        Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
        Kyoto University
        岡本 亮
        From 01 Apr. 2020, To 31 Mar. 2024, Granted
        量子ウォーク;量子光学;量子探索;量子シミュレーション
      • Realization of PT-symmetric quantum optical systems towards innovative quantum state control
        Grant-in-Aid for Challenging Research (Exploratory)
        Medium-sized Section 13:Condensed matter physics and related fields
        Kyoto University
        Ryo Okamoto
        From 29 Jun. 2018, To 31 Mar. 2021, Project Closed
        開放量子系;量子光学;量子情報科学;量子ウォーク;PT対称;PT対称性
      • PT symmetry in open systems: theory and experiment
        Grant-in-Aid for Scientific Research (B)
        Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
        Hokkaido University
        小布施 秀明
        From 01 Apr. 2018, To 31 Mar. 2021, Granted
        非エルミート;PT対称性;量子ウォーク;開放量子系;非エルミート性
      • Realization of quantum absorption imaging using pair annihilation of photons
        Grant-in-Aid for Scientific Research (B)
        Kyoto University
        Ryo Okamoto
        From 01 Apr. 2017, To 31 Mar. 2020, Project Closed
        量子計測;量子情報;量子光学;量子エレクトロニクス;量子測定
      • Toward the experimental verification of CS modified gravity using photonic interferometers
        Grant-in-Aid for Challenging Exploratory Research
        Kyoto University
        Shigeki TAKEUCHI
        From 01 Apr. 2014, To 31 Mar. 2016, Project Closed
        相対論;CS重力理論;光干渉計;重力;量子光学
      • Realization of boson sampling using photons
        Grant-in-Aid for Young Scientists (A)
        Kyoto University;Hokkaido University
        Ryo Okamoto
        From 01 Apr. 2013, To 31 Mar. 2017, Project Closed
        量子情報処理;量子干渉;単一光子源;量子ゲート;量子光学;量子計算;量子測定
      • Realization of absorption spectrum measurement for a single molecule using quantum light
        Grant-in-Aid for Challenging Exploratory Research
        Kyoto University;Hokkaido University
        Ryo Okamoto
        From 01 Apr. 2013, To 31 Mar. 2016, Project Closed
        吸収分光測定;量子光学;分光;量子計測
      • Experimental demonstration of quantum shutter
        Grant-in-Aid for Young Scientists (B)
        Hokkaido University
        Ryo OKAMOTO
        From 01 Apr. 2009, To 31 Mar. 2011, Project Closed
        量子情報;量子ゲート;光子;パラメトリック下方変換
      • Toward the realization of Quantum Cybernetics using photonic quantum circuits
        Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
        Science and Engineering
        Hokkaido University
        Shigeki TAKEUCHI
        From 23 Jul. 2009, To 31 Mar. 2014, Project Closed
        量子サイバネティクス;量子情報;光子;制御;量子回路;フィードバック;量子サイバネテイクス
      • Realization and application of single photons in a single spatio-temporal mode by group velocity engineering
        Grant-in-Aid for Scientific Research (A)
        Hokkaido University
        Shigeki TAKEUCHI
        From 01 Apr. 2008, To 31 Mar. 2011, Project Closed
        量子情報;単一光子;量子光学;非線形光学;疑似位相整合
      • Topological phases in open quantum and classical systems with randomness
        Grant-in-Aid for Scientific Research (B)
        Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
        Hokkaido University
        小布施 秀明
        From 01 Apr. 2022, To 31 Mar. 2026, Granted
        トポロジカル相;開放系;非エルミート;アンダーソン局在;臨界現象
      list
        Last Updated :2022/10/05

        Education

        Teaching subject(s)

        • From 01 Apr. 2022, To 31 Mar. 2023
          Quantum Information Science
          C803, Spring, Graduate School of Engineering, 2
        • From 01 Apr. 2022, To 31 Mar. 2023
          Electric and Electronic Measurement
          6101, Fall, Faculty of Engineering, 2
        • From 01 Apr. 2022, To 31 Mar. 2023
          Practice of Electrical and Electronic Engineering
          6201, Spring, Faculty of Engineering, 2
        • From 01 Apr. 2022, To 31 Mar. 2023
          Introducion to Elecrical and Electronic Engineering
          6074, Fall, Faculty of Engineering, 2
        • From Apr. 2016, To Mar. 2017
          Exercise of Electric and Electronic Circuits
          Spring, 工学部
        • From Apr. 2016, To Mar. 2017
          Fundamental Practice of Electrical & Electronic Engineering
          Fall, 工学部
        • From Apr. 2016, To Mar. 2017
          Electrical and Electronic Engineering Advanced Practice A
          Spring, 工学部
        • From Apr. 2016, To Mar. 2017
          Electrical and Electronic Engineering Advanced Practice B
          Fall, 工学部
        • From Apr. 2017, To Mar. 2018
          Quantum Information Science
          Spring, 工学研究科
        • From Apr. 2017, To Mar. 2018
          Introducion to Elecrical and Electronic Engineering
          Fall, 工学部
        • From Apr. 2018, To Mar. 2019
          Quantum Information Science
          Spring, 工学研究科
        • From Apr. 2018, To Mar. 2019
          Practice of Electrical and Electronic Engineering
          Spring, 工学部
        • From Apr. 2018, To Mar. 2019
          Introducion to Elecrical and Electronic Engineering
          Fall, 工学部
        • From Apr. 2018, To Mar. 2019
          Electric and Electronic Measurement
          Fall, 工学部
        • From Apr. 2019, To Mar. 2020
          Quantum Information Science
          Spring, 工学研究科
        • From Apr. 2019, To Mar. 2020
          Practice of Electrical and Electronic Engineering
          Spring, 工学部
        • From Apr. 2019, To Mar. 2020
          Introducion to Elecrical and Electronic Engineering
          Fall, 工学部
        • From Apr. 2019, To Mar. 2020
          Electric and Electronic Measurement
          Fall, 工学部
        • From Apr. 2020, To Mar. 2021
          Quantum Information Science
          Spring, 工学研究科
        • From Apr. 2020, To Mar. 2021
          Practice of Electrical and Electronic Engineering
          Spring, 工学部
        • From Apr. 2020, To Mar. 2021
          Electric and Electronic Measurement
          Fall, 工学部
        • From Apr. 2021, To Mar. 2022
          Quantum Information Science
          Spring, 工学研究科
        • From Apr. 2021, To Mar. 2022
          Practice of Electrical and Electronic Engineering
          Spring, 工学部
        • From Apr. 2021, To Mar. 2022
          Introducion to Elecrical and Electronic Engineering
          Fall, 工学部
        • From Apr. 2021, To Mar. 2022
          Electric and Electronic Measurement
          Fall, 工学部

        Participation in PhD Defense

        • フォトニック結晶レーザーの短パルス・高ピーク出力化に関する研究
          MORITA RYOHEI, Graduate School of Engineering, Sub-chief Examiner
          23 Mar. 2022

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