Toshimori Honjo, Ph.D.

Toshimori Honjo, Ph.D.

Senior Research Scientist, Supervisor Quantum Optical State Control Research Group Quantum Science and Technology Laboratory NTT Basic Research Laboratories, NTT Corporation 3-1, Morinosato-Wakamiya, Atsugi-shi, Kanagawa Pref., 243-0198 Japan Phone: +81 46 240 3405 Fax: +81 46 240 4726 E-mail: toshimori.honjo "at" ntt.com (toshimori.honjo.ht "at" hco.ntt.co.jp) (honjo.toshimori "at" lab.ntt.co.jp)

Biography

Toshimori Honjo received the B.S., M.S. degrees in information science from Tokyo Institute of Technology, Tokyo, in 1996 and 1998, and Ph.D. degree in engineering from Osaka University, Osaka, in 2007, respectively. He joined NTT Software Laboratories (NTT Information Sharing Platform Laboratories) in 1998. His research topic was secure communication in the internet. He implemented a flexible and high performance VPN protocol stack in Linux and Solaris respectively. In 2003, he moved to NTT Basic Research Laboratories to realize ultimate security with quantum cryptograpy (quantum key distribution). His research topic was quantum communicaton over the opical fiber. He experimentally demonstrated differnetial phase shift quantum key distribution and BBM92 quantum key distribution with entangled photon pairs. In 2009, he stayed at University of Vienna as a visiting researcher. From 2011 to 2015, he belonged to NTT Information Sharing Platform Laboratories (NTT Software Innovation Center) to manage the team of big data processing and analytics. He mainly targeted a hadoop as a big data processing platform, and deep learning as a data analysis method. In 2016, he moved back to NTT Basic Research Laboratories to challenge beyond von-Neumann computing. He is now woring on research and development of quantum communicaton and Coherent Ising Machine. He is a member of Information Processing Society of Japan (IPSJ). He is a Japanese deligation of IEC/ISO JTC3.

Research Interest

Byond Von Nouman Computing
- Coherent Ising Machine
Quantum Communication
- Quantum Key Distribution
  - Differential phase shift quantum key distribution (DPS-QKD)
  - Entanglement-based quantum key distribution (BBM92)
- Quantum Random Number Generator (QRNG)
- Entangled photon pair generation
- Single photon detection
Secure Communication
- TCP/IP protocol stack for secure and mobile communication
  - High performance software implementation of IPSec in Solaris STREAMS for multi processor system
  - Dynamically reconfigurable TCP/IP protocol stack in Linux kernel for VPN access
BigData Processing and Machine Learning
- Hadoop as a big data processing platform
- Deep learning in image analysis

Publications

H. Takesue, K. Inaba, T. Honjo, Y. Yamada, T. Ikuta, Y. Yonezu, T. Inagaki, T. Umeki, and R. Kasahara, "Finding independent sets in large-scale graphs with a coherent Ising machine," Sci. Adv. 11, eads7223 (2025).
K. Inoue and T. Honjo, "Modified general individual attack against differential-phase-shift quantum key distribution," Phys. Rev. A 110, 042626 (2024).
K. Inoue and T. Honjo, "Multiuser Differential-Phase-Shift Quantum Key Distribution System on a Ring Network," IEEE Photonics Technology Letters,36,16,989-992 (2024).
K. Inoue and T. Honjo, "Quantum conference key agreement based on differential-phase-shift quantum key distribution," Quantum Inf Process 23, 253 (2024).
K. Inoue and T. Honjo, "Scalability of the differential-(quadrature)-phase-shift quantum digital signature," J. Opt. Soc. Am. B 41, 166-174 (2024).
Y. Yonezu, K. Inaba, Y. Yamada, T. Ikuta, T. Inagaki, T. Honjo, H. Takesue, "10-GHz-clock time-multiplexed non-degenerate optical parametric oscillator network with a variable planar lightwave circuit interferometer," Opt. Lett. 48, 5787-5790 (2023).
H. P. Lo, T. Ikuta, K. Azuma, T. Honjo, W. J. Munro, and H. Takesue, "Generation of time-bin Greenberger-Horne-Zeilinger state with an optical switch," Quantum Sci. Technol. 8 035003 (2023).
H. Takesue, Y. Yamada, K. Inaba, T. Ikuta, Y. Yonezu, T. Inagaki, T. Honjo, T. Kazama, K. Enbutsu, T. Umeki, and R. Kasahara, "Observing a Phase Transition in a Coherent Ising Machine,", Phys. Rev. Applied 19, L031001 (2023).
K. Inoue and T. Honjo, "Differential-quadrature-phase-shift quantum digital signature," Opt. Express, 30, 24, 42933-42943 (2022).
T. Ikuta, S. Akibue, Y. Yonezu, T. Honjo, H. Takesue and K. Inoue, "Scalable implementation of (d+1) mutually unbiased bases for d-dimensional quantum key distribution," Phys. Rev. Research 4, L042007 (2022).
K. Inoue and T. Honjo, "Differential-phase-shift quantum digital signature without disclosing measurement information," J. Phys. Commun. 6 075003 (2022).
K. Inaba, T. Inagaki, K. Igarashi, S. Utsunomiya, T. Honjo, T. Ikuta, K. Enbutsu, T. Umeki, R. Kasahara, K. Inoue, Y. Yamamoto, and H. Takesue, "Potts model solver based on hybrid physical and digital architecture", Commun Phys 5, 137 (2022).
T. Honjo, T. Sonobe, K. Inaba, T. Inagaki, T. Ikuta, Y. Yamada, T. Kazama, K. Enbutsu, T. Umeki, R. Kasahara, K. Kawarabayashi, and H. Takesue, "100,000-spin coherent Ising machine", Sci. Adv. 7, abh0952 (2021).
T. Inagaki, K. Inaba, T. Leleu, T. Honjo, T. Ikuta, K. Enbutsu, T. Umeki, R. Kasahara, K. Aihara, and H. Takesue, "Collective and synchronous dynamics of photonic spiking neurons," Nature Communications 12, 2325 (2021).
Y. Zhang,H. P. Lo, A. Mink, T. Ikuta, T. Honjo, H. Takesue, and W. J. Munro, "A simple low-latency real-time certifiable quantum random number generator," Nature Communications 12, 1056 (2021).
T. Ikuta, T. Inagaki, K. Inaba, T. Honjo, T. Kazama, K. Enbutsu, T. Kashiwazaki, R. Kasahara, T. Umeki and H. Takesue, "Continuous and long-term stabilization of degenerate optical parametric oscillators for large-scale optical hybrid computers," Opt. Express, 28, 26, 38553-38566 (2020).
H. P. Lo, T. Inagaki, T. Honjo, H. Takesue, "Observation of binary phase states of time-multiplexed degenerate optical parametric oscillator pulses generated using a nonlinear fiber Sagnac loop," Opt. Lett. 45, 4503 (2020).
H. Takesue, K. Inaba, T. Inagaki, T. Ikuta, Y. Yamada, T. Honjo, T. Kazama, K. Enbutsu, T. Umeki and R. Kasahara, "Simulating Ising spins in external magnetic fields with a network of degenerate optical parametric oscillators," Phys. Rev. Applied 13, 054059 (2020).
H. P. Lo, T. Ikuta, N. Matsuda, T. Honjo, W. J. Munro, and H. Takesue, "Quantum Process Tomography of a Controlled-Phase Gate for Time-Bin Qubits," Phys. Rev. Applied 13, 034013 (2020).
R. Hamerly, T. Inagaki, P. L. McMahon, D. Venturelli, A. Marandi, T. Onodera, E. Ng, C. Langrock, K. Inaba, T. Honjo, K. Enbutsu, T. Umeki, R. Kasahara, S. Utsunomiya, S. Kako, K. Kawarabayashi, R. L. Byer, M. M. Fejer, H. Mabuchi, D. Englund, E. Rieffle, H. Takesue, Y. Yamamoto, "Experimental investigation of performance differences between Coherent Ising Machines and a quantum annealer," Sci. Adv. 5, eaau0823 (2019).
H. Takesue, T. Inagaki, K. Inaba, T. Ikuta, and T. Honjo, "Large-scale coherent Ising machine," J. Phys. Soc. Jpn. 88, 061014 (2019).
F. Bohm, T. Inagaki, K. Inaba, T. Honjo, K. Enbutsu, T. Umeki, R. Kasahara, H. Takesue, "Understanding dynamics of coherent Ising machines through simulation of large-scale 2D Ising models," Nature Communications 9, 5020 (2018).
M. Alhussein, K. Inooue and T.Honjo, "Monitoring coincident clicks in differential-quadrature-phase-shift QKD to reveal detector blinding and control attacks," Jpn. J. App. Phys., 58, 1, 012006 (2018).
H. P. Lo, T. Ikuta, N. Matsuda, T. Honjo and H. Takesue "Entanglement generation using a controlled-phase gate for time-bin qubits," Applied Physics Express, 11, 092801 (2018).
R. J. Collins, R. Amiri, M. Fujiwara, T. Honjo, K. Shimizu, K. Tamaki, M. Takeoka, M. Sasaki, E. Andersson and G. S. Buller, "Experimental demonstration of quantum digital signatures over 43 dB channel loss using differential phase shift quantum key distribution,", Sci Rep 7, 3235 (2017).
R. J. Collins, R. Amiri, M. Fujiwara, T. Honjo, K. Shimizu, K. Tamaki, M. Takeoka, E. Andersson, G. S. Buller and M. Sasaki, "Experimental transmission of quantum digital signatures over 90-km of installed optical fiber using a differential phase shift quantum key distribution system," Opt. Lett. 41, 4883-4886 (2016).
T. Inagaki, Y. Haribara, K. Igarashi, T. Sonobe, S. Tamate, T. Honjo, A. Marandi, P. L. McMahon, T. Umeki, K. Enbutsuu, O. Tadanaga, H. Takenouchi, K. Aihara, K. Kawarabayashi, K. Inoue, S. Utsunomiya and H. Takesue, "A cohernet Ising machine for 2000-node optimization problems," Science 354, 6312, 603-606 (2016) DOI: 10.1126/science.aah4243.
柴田、清水、本庄、武居、都倉、"様々な冷却フィルタを用いた超伝導単一光子検出器の極低雑音化および長距離量子暗号通信への応用", 電子情報通信学会論文誌 (招待論文) J99-C, 3, 51-58 (2016).
H. Shibata, T. Honjo and K. Shimizu, "Quantum key distribution over a 70-dB channel loss using ultralow dark count superconducting single-photon detectors," Opt. Lett. 39, 5078-5081 (2014).
K. Shimizu, T. Honjo, M. Fujiwara, T. Itoh, K. Tamaki, S. Miki, T. Yamashita, H. Terai, Z.Wang and M. Sasaki, "Performance of Long-Distance Quantum Key Distribution Over 90-km Optical Links Installed in a Field Environment of Tokyo Metropolitan Area," IEEE Lighwave Technologes, 32, 1, 141-151 (2014).
M. Fujiwara, T. Honjo, K. Shimizu, K. Tamaki and M. Sasaki, "Characteristic of superconductor single photon detector in QKD system under bright illumination blinding attack," Opt. Express, 21, 6604-6312 (2013).
T. Honjo, M. Fujiwara, K. Shimizu, K. Tamaki, S. Miki, T Yamashita, H. Terai, Z. Wang and M. Sasaki, "Countermeasure against tailored bright illumination attack for DPS-QKD," Opt. Express, 21, 2667-2673 (2013).
坂井、梅田、中村、本庄、"大規模分散処理システムのソフトウェア試験とその実践", 情報処理学会デジタルプラクティス, 4, 1, 51-59 (2013).
T. Honjo, T. Inoue and K. Inoue, "Influence of light source linewidth on differential-phase-shift quantum key distribution systems," Opt. Comm. 284, 5856 (2011).
Y. Tokura and T. Honjo, "Differential Phase Shift Quantum Key Distribution (DPS-QKD) Experiments," NTT Technical Review, 9, 9, 1-5 (2011).
M. Sasaki, M. Fujiwara, H. Ishizuka, W. Klaus, K. Wakui, M. Takeoka, A. Tanaka, K. Yoshino, Y. Nambu, S. Takahashi, A. Tajima, A. Tomita, T. Domeki, T. Hasegawa, Y. Sakai, H. Kobayashi, T. Asai, K. Shimizu, T. Tokura, T. Tsurumaru, M. Matsui, T. Honjo, K. Tamaki, H. Takesue, Y. Tokura, J. F. Dynes, A. R. Dixon, A. W. Sharpe, Z. L. Yuan, A. J. Shields, S. Uchikoga, M. Legre, S. Robyr, P. Trinkler, L. Monat, J.-B. Page, G. Ribordy, A. Poppe, A. Allacher, O. Maurhart, T. Langer, M. Peev and A. Zeilinger, "Field test of quantum key distribution in the Tokyo QKD Network," Opt. Express, 19, 10387-10409 (2011).
N. Namekata, H. Takesue, T. Honjo, Y. Tokura and S. Inoue, "High-Rate Quantum Key Distribution Over 100 km Using Ultra-Low-Noise, 2-GHz Sinusoidally Gated InGaAs/InP Avalanche Photodiodes," Opt. Express, 19, 10632-10639 (2011).
H. Shibata, H. Takesue, T. Honjo, T. Akazaki and Y. Tokura , "Single-photon detection using magnesium diboride superconducting nanowires," Appl. Phys. Lett. 97, 212504 (2010).
H. Shibata, M. Asahi, T. Maruyama, T. Akazaki, H. Takesue, T. Honjo and Y. Tokura, "Optical Response and Fabrication of MgB2 Nanowire Detectors," IEEE Trans. Appl. Superconductivity, 19, 358-360 (2009).
J. F. Dynes, H. Takesue, Z. L. Yuan, A. W. Sharpe, K. Harada, T. Honjo, H. Kamada, O. Tadanaga, Y. Nishida, M. Asobe and A. J. Shields, "Efficient entanglement distribution over 200 kilometers," Opt. Express 17, 11440-11449 (2009).
H. Takesue, T. Honjo, K. Harada and B. Miquel, "Quantum communication experiments using telecom-band entangled photons," IEICE Trans. Fundamentals E93-A, 903-909 (2010).
H. Takesue, T. Honjo, K. Tamaki and Y. Tokura, "Differential phase shift quantum key distribution," IEEE Communications Magazine 47, 102 (2009).
T. Honjo, A. Uchida, K. Amano, K. Hirano, H. Someya, H. Okumura, K. Yoshimura, P. Davis and Y. Tokura, "Differential-phase-shift quantum key distribution experiment using fast physical random bit generator with chaotic semiconductor lasers," Opt. Express 17, 9053-9061 (2009).
Y. Iwai, T. Honjo, K. Inoue, H. Kamada, Y. Nishida, O. Tadanaga and M. Asobe, "Polarization independent differential phase shift quantum key distribution system using up-conversion detectors," Opt. Lett. 34, 1606-1608 (2009).
Q. Zhang, H. Takesue, T. Honjo, K. Wen, T. Hirohata, M. Suyama, Y. Takiguchi, H. Kamada, Y. Tokura, O. Tadanaga, Y. Nishida, M. Asobe and Y. Yamamoto, "Megabits secure key rate quantum key distribution," New J. Phys. 11, 045010 (2009).
T. Honjo, S. W. Nam, H. Takesue, Q. Zhang, H. Kamada, Y. Nishida, O. Tadanaga, M. Asobe, B. Baek, R. Hadfield, S. Miki, M. Fujiwara, M. Sasaki, Z. Wang, K. Inoue and Y. Yamamoto, "Long distance entanglement-based quantum key distribution over optical fiber," Opt. Express, 16, 23, 19118-19126 (2008).
K. Inoue, T. Ohashi, T. Kukita, K. Watanebe, S. Hayashi, T. Honjo and H. Takesue, "Differential-phase-shift quantum secret sharing," Opt. Express, 16, 20, 15469-15476 (2008).
H. Shibata, T. Maruyama, T. Akazaki, H. Takesue, T. Honjo and Y. Tokura,"Photon Detection and Fabrication of MgB2 Nanowire," Physica C 468, 1992-1994 (2008).
H. Kamada, M. Asobe, T. Honjo, H. Takesue, Y. Tokura, Y. Nishida, O. Tadanaga and H. Miyazawa, "Efficient and low-noise single-photon detection in 1550 nm communication band by frequency upconversion in periodically poled LiNbO3 waveguides," Opt. Lett. 33, 7, 639-641 (2008).
T. Honjo, S. Yamamoto, T. Yamamoto, H. Kamada, Y. Nishida, O. Tadanaga, M. Asobe and K. Inoue, "Field trial of differential-phase-shift quantum key distribution using polarization independent frequency up-conversion detectors," Opt. Express, 15, 24, 15920-15927 (2007).
T. Honjo, H. Takesue, H. Kamada, Y. Nishida, O. Tadanaga, M. Asobe and K. Inoue, "Long-distance distribution of time-bin entangled photon pairs over 100 km using frequency up-conversion detectors," Opt. Express, 15, 21, 13957-13964 (2007).
N. Namekata, G. Fujii, S. Inoue, T. Honjo and H. Takesue, "Quantum key distribution using single-photon detectors based on a sinusoidally gated InGaAs/InP avalanche photodiode," Appl. Phys. Lett. 91, 011112 (2007).
H. Takesue, S. W. Nam, Q. Zhang, R. H. Hadfield, T. Honjo, K. Tamaki and Y. Yamamoto, "Quantum key distribution over 40 dB channel loss using superconducting single-photon detectors," Nature Photonics 1, 343 (2007).
T. Honjo, H. Takesue and K. Inoue, "Differential-phase quantum key distribution experiment using a series of quantum entangled photon pairs," Opt. Lett. 32, 9, 1165-1167 (2007).
T. Honjo, H. Takesue and K. Inoue, "Generation of energy-time entangled photon pairs in 1.5um band with periodically poled lithium niobate waveguide," Opt. Express, 15, 4, 1679-1683 (2007).
H. Takesue, T. Honjo and H. Kamada, "Differential phase shift quantum key distribution using 1.3-um up-conversion detectors," Jpn. J. App. Phys., 45, 7, 5757-5760 (2006).
T. Honjo, K. Inoue, A. Sahara, E. Yamazaki and H. Takahashi, "Quantum Key Distribution Experiment through a PLC Matrix Switch," Opt. Comm. 263, 120-123 (2006).
T. Honjo and K. Inoue, "Differential-phase-shift quantum key distribution with an extended degree of freedom," Opt. Lett. 31, 4, 522 (2006).
H. Takesue, E. Diamanti, T. Honjo, C. Langrock, M. M. Fejer, K. Inoue and Y. Yamamoto, "Differential phase shift quantum key distribution experiment over 105 km fibre," New J. Phys. 7, 232 (2005).
E. Diamanti, H. Takesue, T. Honjo, K. Inoue and Y.Yamamoto, "Performance of various quantum key distribution systems using 1.55 um up-conversion single-photon detectors," Phys. Rev. A, 72, 052311 (2005).
T. Honjo and K. Inoue, "Plug & Play Quantum Key Distribution Using Modulation Sidebands for Shifting frequency," Jpn. J. App. Phys. 44, 9A, 6550-6552 (2005).
K. Inoue and T. Honjo, "Robustness of differential-phase-shift quantum key distribution against photon-number-splitting attack," Phys. Rev. A, 71, 042305, (2005).
T. Honjo and K. Inoue, "Differential-phase-shift Quantum Key Distribution", NTT Technical Review, 2, 12, 26-33 (2004).
T. Honjo, K. Inoue and H. Takahashi, "Differential-phase-shift quantum key distribution experiment with a planar light-wave circuit Mach-Zehnder interferometer," Opt. Lett. 29, 32, 2797-2799, (2004).

International Conferences

Y. Yonezu, K. Inaba, Y. Yamada, T. Ikuta, T. Inagaki, T. Honjo, and H. Takesue, "Observing the Berezinskii-Kosterlitz-Thouless transition in a coherent XY machine with a planar lightwave circuit interferometer," International School and Symposium on Nanodevices and quanTum Technologies (ISNTT) 2024, We-62, December 4, 2024, Atsugi.
T. Ikuta, S. Akibue, Y. Yonezu, T. Honjo, and H. Takesue, "Optimal dimension of quantum key distribution using high-dimensional time-bin entanglement against a multi-photon error," International School and Symposium on Nanodevices and quanTum Technologies (ISNTT) 2024, We-08, December 4, 2024, Atsugi.
T. Inagaki, K. Inaba, Y. Yamada, T. Ikuta, Y. Yonezu, T. Honjo, and H. Takesue, "Chimera states in photonic spiking neural networks with coupled degenerate optical parametric oscillators," International School and Symposium on Nanodevices and quanTum Technologies (ISNTT) 2024, We-07, December 4, 2024, Atsugi.
H. Takesue, K. Inaba, T. Honjo, T. Ikuta, Y. Yonezu, Y. Yamada, and T. Inagaki, "Solution search of maximum independent set problems with a coherent Ising machine," International School and Symposium on Nanodevices and quanTum Technologies (ISNTT) 2024, Tu-07, December 3, 2024, Atsugi. S. Naganuma, M. Arai, A. Li, H. Takesue, K. Inaba, K. Aihara, and M. Hasegawa, "High-speed optimization of beam allocation in MU-MIMO using a coherent Ising machine," The 2024 International Symposium on Nonlinear Theory and Its Applications (NOLTA2024), 3141, December 3, 2024, Ha long Bay, Vietnam.
T. Inagaki, K. Inaba, Y. Yamada, T. Honjo, T. Ikuta, Y. Yonezu, T. Kazama, K. Enbutsu, T. Umeki, R. Kasahara, K. Aihara, and H. Takesue, "Combinatorial optimization with photonic spiking neural networks," International Conference on Neuromorphic Photonics (ICNP) 2024, November 23, 2024, Shanghai, China (invited).
H. Takesue, T. Inabaki, K. Inaba, T. Ikuta, Y. Yamada, Y. Yonezu, and T. Honjo, "A coherent Ising machine based on a degenerate optical parametric oscillators," The Annual Conference of the IEEE Photonics Society (IPC 2024), TuH3.1, November 12, 2024, Rome, Italy (invited).
T. Honjo, S. Miyajima, S. Miki, H. Terai, H. P. Lo, T. Ikuta, Y. Yonezu, and H. Takesue, "High-count-rate single photon detection system using multi-pixel SSPD with SFQ circuit and FPGA TDC, QCrypt 2024, poster No. 171, September 5, 2024, Vigo, Spain.
H. Takesue, K. Inaba, T. Honjo, T. Ikuta, Y. Yonezu, Y. Yamada, and T. Inagaki, "Solving maximum independent set problems with a coherent Ising machine," SPIE Optics+Photonics 2024, Paper 13113-19, August 20, 2024, San Diego, CA.
Y. Sanari, A. Taniguchi, M. Miura, H. Takahashi, K. Takasugi, H. P. Lo, T. Ikuta, T. Honjo, H. Takesue, "668-kbps Quantum Key Distribution over 100-km Dispersion Shifted Fiber with 10 GHz Clock," CLEO-PR, Fr1C-2, Incheon, Korea, Aug. 2024.
H. Takesue, T. Inagaki, K. Inaba, T. Ikuta, Y. Yamada, Y. Yonezu, T. Honjo, "Computation with Degenerate Optical Parametric Oscillator Networks, " OFC 2024, W1F.2, Mar. San Diego, 2024.
H. Takesue, Y. Yamada, K. Inaba, T. Ikuta, Y. Yonezu, T. Inagaki, and T. Honjo, "Coherent Ising machine as a thermodynamic system," IEEE Photonics Society Summer Topicals 2023, TuF4.1, Giardini Naxos, Italy (2023).
H. P. Lo, T. Ikuta, K. Azuma, T. Honjo, W. J. Munro, and H. Takesue, "Three-photon time-bin entanglement generation using an optical switch," CLEO Pacifc Rim 2022, CThA7E-02, Sapporo (2022).
A. Taniguchi, Y. Sanari, H. Takahashi, K. Obana, H. Nishizawa, K. Takasugi, H. P. Lo, T. Ikuta, T. Honjo, and, H. Takesue, "20-GHz quantum key distribution using Mach-Zehnder intensity modulation and low jitter superconducting single photon detectors," CLEO Pacifc Rim 2022 (2022).
T. Honjo, K. Inaba, T. Inagaki, T. Ikuta, Y. Yamada, and H. Takesue, "A Coherent Ising Machine Based on a Network of 100, 000 Degenerate Optical Parametric Oscillator Pulses," IEEE Nano 2022, ThDT3-5, Palma de Mallorca, Spain, (2022).
H. P. Lo, T. Ikuta, K. Azuma, T. Honjo, W. J. Munro, and H. Takesue, "Three-photon time-bin entanglement generation using an optical switch," CLEO Pacifc Rim 2022, CThA7E-02, Sapporo, (2022).
A. Taniguchi, Y. Sanari, H. Takahashi, K. Obana, H. Nishizawa, K. Takasugi, H. P. Lo, T. Ikuta, T. Honjo, and, H. Takesue, "20-GHz quantum key distribution using Mach-Zehnder intensity modulation and low jitter superconducting single photon detectors," CLEO Pacifc Rim 2022, CThA7E-03, Sapporo, (2022).
H. Takesue, T. Inagaki, K. Inaba, T. Ikuta, Y. Yamada, Y. Yonezu, and T. Honjo, "Computation with degenerate optical parametric oscillator networks," 27th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing (OECC/PSC 2022), WC3-1, Toyama (2022).
H. Takesue, Y. Yamada, K. Inaba, T. Ikuta, Y. Yonezu, T. Inagaki, T. Honjo, T. Kazama, K. Embutsu, T. Umeki, and R. Kasahara, "Simulating phase transition in two-dimensional Ising model on coherent Ising machine," CLEO 2022, SF4F.4, San Jose (2022).
T. Ikuta, S. Akibue, Y. Yonezu, T. Honjo, H. Takesue and K. Inoue, "Scalable preparation and measurement of 2N-dimensional time-bin states in (2N+1) mutually unbiased baases," CLEO 2022, FTu5A.7, San Jose (2022).
H. P. Lo, T. Ikuta, T. Honjo, W. J. Munro, and H. Takesue, "Hong-Ou-Mandel interference between independent light sources for three-photon time-bin entanglement," ISNTT2021, S04-3, (2021).
T. Inagaki, K. Inaba, T. Leleu, T. Honjo, T. Ikuta, K. Enbutsu, T. Umeki, R. Kasahara, K. Aihara, and H. Takesue, “Photonic spiking neurons with coupled degenerated optical parametric oscillators,”, Photonics Switching and Computing 2021 (PSC 2021), Tu5B.2, (2021).
Y. B. Zhang, H. P. Lo, A. Mink, T. Ikuta, T. Honjo, H. Takesue, and W. J. Munro, “A simple low-latency real-time certifiable quantum random number generator,”21th Asian Quantum Information Science Conference (AQIS 2021), poster 55, September 2, 2021, online conference, (2021).
Y. B. Zhang, H. P. Lo, A. Mink, T. Ikuta, T. Honjo, H. Takesue, and W. J. Munro, “A simple low-latency real-time certifiable quantum random number generator,” QCRYPT 2021, poster 37, August 23, 2021, online conference, (2021).
W. J. Munro, Y. B. Zhang, H. P. Lo, A. Mink, T. Ikuta, T. Honjo, and H. Takesue, “A real-time low-latency certifiable QRNG,”Quantum Communications and Quantum Imaging XIX, 1183504, August 1, 2021, online conference, (2021).
Y. B. Zhang, H. P. Lo, T. Ikuta, T. Honjo, H. Takesue, and W. J. Munro, “A Simple Low-latency Real-time Certifiable Quantum Random Number Generator,” CLEO:2020, FF1D.2, May 15, 2020, virtual conference, (2020).
H. Takesue, T. Inagaki, K. Inaba, T. Ikuta, Y. Yamada, and T. Honjo, “A Coherent Ising Machine Based on Degenerate Optical Parametric Oscillators, CLEO:2020, SM1L.1, May 11, 2020, virtual conference, (2020).
H. P. Lo, T. Inagaki, T. Honjo, and H. Takesue, “Coherence property of time-multiplexed degenerate optical parametric oscillator pulses generated using a nonlinear fiber Sagnac loop,” CLEO:2020, SM1L.5, May 11, 2020, virtual conference, (2020).
H. Takesue, K. Inaba, T. Inagaki, T. Ikuta, Y. Yamada, T. Honjo, T. Kazama, K. Enbutsu, T. Umeki, R. Kasahara, “Simulating One- and Two-Dimensional Ising Models in a Magnetic Field Using a Coherent Ising Machine,” CLEO:2020, JTu2F.15, May 12, 2020, virtual conference (poster), (2020).
Y. B. Zhang, H. P. Lo, T. Ikuta, T. Honjo, H. Takesue, and W. J. Munro, “A Simple Low-latency Real-time Certifiable Quantum Random Number Generator,” CLEO:2020, FF1D.2, May 15, 2020, virtual conference, (2020).
J. Arai, S. Yagi, H. Uchiyama, T. Honjo, T. Inagaki, K. Inaba, T. Ikuta, H. Takesue, and K. Horikawa, "Hybrid Computing Platform for Combinatorial Optimization with the Coherent Ising Machine", SC19, Poser 85, Nov. 20, 2019, Denver, (2019).
H. P. Lo, T. Ikuta, N. Matsuda, T. Honjo and H. Takesue "Electro-optic modulators for photonic quantum information processing, " SPIE Photonics Asia, Quantum and Nonlinear Optics VI, Paper 11195-24, October 22, 2019, Hangzhou, China (2019).
T Inagaki, K Inaba, T Honjo, K Enbutsu, T Umeki, R Kasahara, H Takesue, "Combinatorial optimization with a network of degenerated optical parametric oscillators," Signal Processing in Photonic Communications, SpM2E. 4, July 29, 2019, Burlingame, CA (2019).
Y. Zhang, H. P. Lo, T. Ikuta, T. Honjo, H. Takesue and W. J. Munro, "A simple low-latency real-time certiable quantum random number generator," 19th Asian Quantum Information Science Conference (AQIS), poster 47, August 20,2019, Seoul, Korea. (2019).
H. P. Lo, T. Ikuta, N. Matsuda, T. Honjo, W. J. Munro, and H. Takesue, "Experimental Quantum Process Tomography of Controlled-phase Gate for Time-bin Qubits," 2019 IEEE Photonics Society Summer Topical Meeting Series (SUM), TuF3.3, July 9, 2019, Ft. Lauderdale, FL. (2019).
M. Alhussein, K. Inooue and T.Honjo, "BB84 and DQPS-QKD experiments using one polarization-insensitive measurement setup with a countermeasure against blinding and controlling attack," CLEO2019, JTu2A.28, San Jose May 2018.
H. Ito, H. Yasuda, K. Kurasawa, J. Ma, T. Honjo, T. Inagaki, K. Inaba, T. Ikuta, H. Takesue, K. Aihara, M. Hasegawa "Experiments on a Coherent Ising Machine to Solve Traveling Salesman Problems," Coherent Network Computing (CNC) 2019, March 18, 2019, Atsugi, P19 (poster).
H. Takesue, T. Inagaki, K. Inaba, T. Ikuta, and T. Honjo, "Large-scale coherent Ising machine," Coherent Network Computing (CNC) 2019, March 18, 2019, Atsugi (organizer talk).
T. Inagaki, K. Inaba, K. Igarashi, S. Utsunomiya, T. Honjo, T. Ikuta, K. Enbutsu, T. Umeki, R. Kasahara, K. Inoue, Y. Yamamoto, and H. Takesue, “Potts model solver with coherent Ising machine,” the 49th Winter Colloquium on the Physics of Quantum Electronics, January 7, 2019, Snowbird, Utah (invited).
H. Takesue, T. Inagaki, K. Inaba, T. Ikuta, and T. Honjo, "A coherent Ising machine for solving combinatorial optimization problems," The 3rd Laser Solutions for Space and the Earth (LSSE 2018), LSSE1-1, Optics and Photonics International Congress (OPIC) 2018, Yokohama, April 24, 2018 (invited).
H. P. Lo, T. Ikuta, N. Matsuda, T. Honjo and H. Takesue, "Demonstration of controlled-phase gate for time-bin qubits," CLEO Pacifc Rim 2018, W2G.5, Hong Kong, Aug. 2018.
T. Honjo, T. Inagaki, K. Inaba, T. Ikuta and H. Takesue, "Long-Term Stable Operation of Coherent Ising Machine for Cloud Service," CLEO2018, JTu2A.87, San Jose May 2018.
H. Takesue, T. Inagaki, K. Inaba, and T. Honjo, "A coherent Ising machine for solving combinatorial optimization problems," 2017 Workshop on Innovative Nanoscale Devices and Systems (WINDS 2017), Hawaii Nov. 28, 2017 (invited).
H. Takesue, T. Inagaki, K. Inaba, T. Honjo, T. Ikuta, H. Uchiyama, K. Enbutsu, T. Umeki, R. Kasahara, "Solving intractable problems with coherent Ising machine," JSAP-OSA Joint Symposia 2017, 7p-A410-3, Fukuoka Sep. 7, 2017 (invited).
R. J. Collins, R. Amiri, M. Fujiwara, T. Honjo, K. Shimizu, K. Tamaki, M. Takeoka, R. Donaldson, M.Sasaki, E. Andersson and G. Buller, "Quantum Digital Signatures Transmitted Over a Channel Loss Equivalent to 134 km," QCRYPT2017, We459, Cambridge, UK, Sep. 2017.
H. Takesue, T. Inagaki, K. Inaba, and T. Honjo, "Solving large-scale optimization problems with coherent Ising machine," CLEO Pacific Rim 2017, Oral 2-4O-1, Singapore Aug. 2, 2017 (invited).
R. J. Collins, R. Donaldson, R. Amiri, M. Fujiwara, T. Honjo, K. Shimizu, K. Tamaki, M. Takeoka, P. Wallden, V. Dunjko, M. Sasaki, E. Andersson, J. Jeffers and G. Buller, "Kilometer Transmission Range Quantum Digital Signatures," QCRYPT2016, No.63, Washington DC, USA, Sep. 2016.
R. J. Collins, M. Fujiwara, R. Amiri, T. Honjo, K. Shimizu, K. Tamaki, M. Takeoka, E. Andersson, G. S. Buller, M. Sasaki, "Photonic quantum digital signatures operating over kilometer ranges in installed optical fiber," SPIE Security+Defence, 9996-4, Edinburgh, UK, Sep. 2016.
T. Yamamuro, M. Onizuka and T. Honjo, "Tree Contraction for Compressed Suffix Arrays on Modern Processors", DASFFA, 363-378, Hanoi, Vietnam, Apr. 2015.
H. Shibata, K. Shimizu, T.Honjo, H.Takesue and Y.Tokura, "Fabrication of ultralow noise SSPD and long distance QKD experiment," ISNTT2013, PTu4, Kanagawa, Japan, Nov. 2013.
T. Honjo and K. Oikawa, "Hardware acceleration of Hadoop MapReduce," 2013 IEEE International Conference on Big Data (IEEE BigData 2013), 118-124, Santa Clara, CA, Oct. 2013.
H. Shibata, T. Honjo and K. Shimizu, "Quantum key distribution over a 60-dB channel loss using SSPD with ultralow dark count rate," CLEO-PR, PD1b-4, Kyoto, Japan, Jul. 2013.
K. Shimizu, T. Honjo, M. Fujiwara, T. Itoh, K. Tamaki, S. Miki, T. Yamashita, H. Terai, Z.Wang and M. Sasaki, "Performance of a long distance quantum key distribution in the field environment of 90-km optical links installed in Tokyo metropolitan area," LPHYS'13, 7.2.3, Prague, Czech Republic, Jul. 2013.
T. Honjo, M. Fujiwara, K. Shimizu, K. Tamaki, S. Miki, T. Yamashita, H. Terai, Z.Wang and M. Sasaki, "Countermeasure against tailored bright illumination attack for DPS-QKD," QCRYPT2012, 12, Singapore, Sep. 2012.
K. Shimizu, T. Honjo, M. Fujiwara, S. Miki, T. Yamashita, H. Terai, Z. Wang and M. Sasaki, "Middle-term operation performance of long-distance quantum key distribution over a field-installed 90-km fiber-optic loop," QCMC 2012, P3-33, Vienna, Austria, Jul. 2012.
M. Fujiwra, M. Sasaki, H. Ishizuka, W. Klaus, K. Wakui, M. Takeoka, A. Tanaka, K. Yoshino, Y. Nambu, S. Takahashi, A. Tajima, A. Tomita, T. Domeki, T. Hasegawa, Y. Sakai, H. Kobayashi, K. Shimizu, T. Tokura, T. Tsurumaru, M. Matsui, T. Honjo, K. Tamaki, H. Takesue, Y. Tokura, J. F. Dynes, A. W. Sharpe, Z. L. Yuan, A. Dixon, A. J. Shields, S. Uchikoga, M. Legre, S. Robyr, P. Trinkler, G. Ribordy, A. Poppe, A. Allacher, T Langer, M. Peev and A. Zeilinger, "Field Demonstration of Quantum Key Distribution in the Tokyo QKD Network", IQEC-CLEO-PR 2011, 3470-IT-1, Sydney, Australia, Aug. 2011.
N. Namekata, H. Takesue, T. Honjo, Y. Tokura and S. Inoue, "Practical Quantum Key Distribution Over 100 km Using Sinusoidally Gated InGaAs/InP Avalanche Photodiodes," CLEO/IQEC 2011, JTuC3, Baltimore, Maryland, May. 2011.
M. Sasaki, M. Fujiwra, H. Ishizuka, W. Klaus, K. Wakui, M. Takeoka, A. Tanaka, K. Yoshino, Y. Nambu, S. Takahashi, A. Tajima, A. Tomita, T. Domeki, T. Hasegawa, Y. Sakai, H. Kobayashi, K. Shimizu, T. Tokura, T. Tsurumaru, M. Matsui, T. Honjo, K. Tamaki, H. Takesue, Y. Tokura, J. F. Dynes, A. W. Sharpe, Z. L. Yuan, A. Dixon, A. J. Shields, S. Uchikoga, M. Legre, S. Robyr, P. Trinkler, G. Ribordy, A. Poppe, A. Allacher, T Langer, M. Peev and A. Zeilinger, "Tokyo QKD Network and the evolution to Secure Photonic Network," CLEO/IQEC 2011, JTuC1, Baltimore, Maryland, May 2011.
T. Honjo, H. Takesue and Y. Tokura, "QUANTUM KEY DISTRIBUTION/COMMUNICATION RESEARCH IN NTT," UQCC 2010, S2-3, Tokyo, Japan, Oct. 2010.
A. F. Dynes, H. Takesue, Z. L. Yuan, A. W. Sharpe, K. Harada, T. Honjo, H. Kamada, O. Tadanaga, Y. Nishida, M. Asobe and A. J. Shields, "Efficient entanglement distribution over 200 kilometers fiber using self-differencing InGaAs avalanche photodiodes," 2010 International Symposium on Physics of Quantum Technology (ISPQT), 8TH-54, Tokyo, Japan, Apr. 2010.
A. F. Dynes, H. Takesue, Z. L. Yuan, A. W. Sharpe, K. Harada, T. Honjo, H. Kamada, O. Tadanaga, Y. Nishida, M. Asobe and A. J. Shields, "Efficient entanglement distribution over 200 kilometers fiber using self-differencing InGaAs avalanche photodiodes," Frontiers in Optics 2009, JWE2, San Jose, Oct. 2009.
T. Honjo, "Gigahertz Clocked Quantum Key Distribution System using FPGA," ECOC 2009, P4.06, Vienna, Austria, Sep. 2009.
H. Shibata, H. Takesue, T. Honjo, T. Akazaki and Y. Tokura, "Superconducting Nanowire Photon Detectors using MgB2," 9th European Conference on Applied Superconductivity (EUCAS'09), Dresden, Sep. 2009.
T. Honjo, A. Uchida, K. Amano, K. Hirano, H. Someya, H. Okumura, K. Yoshimura, P. Davis and Y. Tokura, "Differential-phase-shift quantum key distribution experiment using fast physical random bit generator with chaotic semiconductor lasers," LPHYS'09, 7.5.6, Barcelona, Spain, Jul. 2009 (invited).
H. Shibata, H. Takesue, T. Honjo, T. Akazaki and Y. Tokura, "Optical Response of MgB2 Nanowires with Various Dimensions," ISEC 2009, MD-P09, Fukuoka, Japan, Jun. 2009.
A. Uchida, T. Honjo, K. Amano, K. Hirano, H. Someya, H. Okumura, S. Yoshimori, K. Yoshimura, P. Davis and Y. Tokura, "Fast physical random bit generator based on chaotic semiconductor lasers: Application to quantum cryptography," CLEO/Europe-EQEC, CB.P.1, Munich, Germany, Jun. 2009.
A. F. Dynes, H. Takesue, Z. L. Yuan, A. W. Sharpe, K. Harada, T. Honjo, H. Kamada, O. Tadanaga, Y. Nishida, M. Asobe and A. J. Shields, "Ultra-long distance and efficient entanglement distribution over 200 kilometers," CLEO/IQEC 2009, IPDA7, Baltimore, Jun. 2009.
Q. Zhang, H. Takesue, T. Honjo, K. Wen, T. Hirohata, M. Suyama, Y. Takiguchi, H. Kamada, Y. Tokura, O. Tadanaga, Y. Nishida, M. Asobe and Y. Yamamoto, "Megabits Secure Key Rate Quantum Key Distribution," CLEO/IQEC 2009, ITuI1, Baltimore, Jun. 2009.
K. Inoue, Y. Iwai, T. Kukita and T. Honjo, "Differential-quadrature-phase-shift (DQPS) quantum key distribution," CLEO/IQEC 2009, ITuI4, Baltimore, Jun. 2009.
K. Inoue, H. Takesue and T. Honjo, "DPS quantum key distribution and related technologies," SPIE Photonic West, 7236-16, Jan. 2009 (invited).
T. Kukita, T. Ohashi, S. Hayashi, T. Honjo, H. Takesue and K. Inoue, "Differential-phase-shift quantum secret sharing," 2008 International Symposiumon Physics of Quantum Technology, TU-E2, Nara, Japan, Nov. 2008.
Q. Zhang, H. Takesue, T. Honjo, K. Wen, T. Hirohata, M. Suyama, Y. Takiguchi, H. Kamada, Y. Takura, O. Tadanaga, Y. Nishida, M. Asobe, S. W. Nam, R. H. Hadfield, K. Tamaki, K. Inoue and Y. Yamamoto, "Experimental Research Status of Differential Phase Shifted Quantum key distribution," 2008 International Symposiumon Physics of Quantum Technology, TH-6E, Nara, Japan, Nov. 2008.
T. Honjo, S. W. Nam, H. Takesue, Q. Zhang, H. Kamada, Y. Nishida, O. Tadanaga, M. Asobe, B. Baek, R. Hadfield, S. Miki, M. Fujiwara, M. Sasaki, Z. Wang, K. Inoue and Y. Yamamoto, "Long distance entanglement-based quantum key distribution over optical fiber," 2008 International Symposiumon Physics of Quantum Technology, TH-E2, Nara, Japan, Nov. 2008.
H. Shibata, M. Asahi, T. Maruyama, T. Akazaki, H. Takesue, T. Honjo and Y. Tokura, "Optical Response of MgB2 Nanowire," International Symposium on Superconductivity (ISS2008), FDP-32, Tsukuba, Oct. 2008.
H. Takesue and T. Honjo, "Quantum communication experiments using telecom-band entangled photons," LEOS Annual Meeting 2008, ThG4, Newport Beach, California, Nov. 13 2008 (invited).
T. Honjo, H. Takesue, H. Kamada, K. Tamaki, H. Shibata, K. Shimizu, Y. Tokura,S. Yamamoto, T. Yamamoto, Y. Nishida, O. Tadanaga, M. Asobe and K. Inoue, "Field trial of differential-phase-shift QKD using polarization independent freqeuncy up-conversion detectors," SECOQC 2008, Vienna, Austria, Oct. 10 2008.
H. Shibata, M. Asahi, T. Maruyama, T. Akazaki, H. Takesue, T. Honjo and Y. Tokura, "Optical Response and Fabrication of MgB2 Nanowire Detectors," 2008 Applied Superconductivity Conference, ASC 2008, 3EPD02, Chicago, Aug. 20, 2008.
T. Honjo, S. W. Nam, H. Takesue, Q. Zhang, H. Kamada, Y. Nishida, O. Tadanaga, M. Asobe, B. Baek, R. Hadfield, S. Miki, M. Fujiwara, M. Sasaki, Z. Wang, K. Inoue and Y. Yamamoto, "Entanglement-based BBM92 QKD experiment using superconducting single photon detectors," LPHYS'08, 7.10.4, Trondheim, Norway, Jul. 2008 (invited).
Y. Iwai, T. Honjo, K. Inoue, H. Kamada, Y. Nishida, O. Tadanaga and M. Asobe, "Polarization independent DPS-QKD system using up-conversion detectors," CLEO/QELS 2008, QWB5, San Jose, May 2008.
H. Takesue, T. Honjo, K. Tamaki and Y. Tokura, "Differential phase shift quantum key distribution," ITU-T Kaleidoscope Academic Conference: Innovations in NGN - Future Network and Services, S8.2, May 13, 2008, Geneva, 2008.
T. Honjo, S. W. Nam, H. Takesue, Q. Zhang, H. Kamada, Y. Nishida, O. Tadanaga, M. Asobe, B. Baek, R. Hadfield, S. Miki, M. Fujiwara, M. Sasaki, Z. Wang, K. Inoue and Y. Yamamoto, "Entanglement-based BBM92 QKD experiment using superconducting single photon detectors," CLEO/QELS 2008, QWB1, San Jose, May 2008.
H. Shibata, T. Maruyama, T. Akazaki, H. Takesue, T. Honjo and Y. Tokura, "Photon detection and fabrication of MgB2 nanowire," International Symposium on Superconductivity (ISS2007), FD-13, Tsukuba, Nov. 2007.
N. Namekata, G. Fujii, T. Honjo, H. Takesue and S. Inoue, "Quantum key distribution using single-photon detectors based on a sinusoidally gated InGaAs/InP avalanche photodiode," CLEO/Pacific Rim 2007, Korea, PDPA-5, Aug. 2007.
K. Inoue, H. Takesue and T. Honjo, "Differential-Phase-Shift Quantum Key Distribution," SPIE Optics East, 6780-39, Boston, Massachusetts, USA, Sep. 2007.
T. Honjo, H. Takesue, H. Kamada, Y. Nishida, O. Tadanaga, M. Asobe and K. Inoue, "Long-distance distribution of time-bin entangled photon pairs over 100 km using frequency up-conversion detectors," LPHYS'07, 7.7.2, Leon, Mexico, Aug. 2007 (invited).
K. Inoue, H. Takesue and T. Honjo, "Differential phase shift quantum key distribution using single-photon detectors," OFC/NFOEC, OWT2, California, Mar. 2007.
T. Honjo, H. Takesue and K. Inoue, "Differential-phase quantum key distribution experiment using a series of quantum entangled photon pairs," LPHYS'06, 7.7.5, Lausanne, Switzerland, Jul. 2006.
K. Inoue, H. Takesue and T. Honjo, "Differential-Phase-Shift Quantum Key Distribution," IEEE/LEOS Summer Topicals 2006, TuB1.2, Jul. 2006. (Invited)
E. Diamanti, C. Langrock, E. Waks, M. M. Fejer, Y. Yamamoto, H. Takesue, T. Honjo and K. Inoue, "Differential Phase Shift Quantum Key Distribution with Up-Conversion Single-Photon Detectors," IEEE/LEOS Summer Topicals 2006, TuB1.1, Jul. 2006. (Invited)
E. Diamanti, C. Langrock, M. M. Fejer, Y. Yamamoto,H. Takesue, T. Honjo and K. Inoue, "Fast and long-distance differential-phase-shift quantum key distribution," CLEO/QELS 2006, JTuH2, California, May. 2006.
T. Honjo, H. Takesue and K. Inoue, "Generation of energy-time entangled photon pairs in 1.5um band with periodically poled lithium niobate waveguides," CLEO/QELS 2006, JTuA5, California, May. 2006.
H. Takesue, T. Honjo, K. Inoue, E. Diamanti, C. Langrock, M. M. Fejer and Y. Yamamoto, "Ultra-Fast Differential-Phase-Shift Quantum Key Distribution Using Single-Photon Detectors Based on Up-Conversion in Periodically Poled Lithium Niobate Waveguides," OFC/NFOEC, OFL2, California, Mar. 2006.
T. Honjo and K. Inoue, "Differential-Phase-Shift QKD with an Extended Degree of Measurement," IQEC and CLEO-PR 2005, QFD3-5, Tokyo, Jul. 2005.
T. Honjo, K. Inoue and H. Takahashi, "Differential-phase-shift quantum key distribution experiment using a glass waveguide interferometer," Conference on Lasers and Electro Optics/International Quantum Electronics Conference 2004 (CLEO/IQEC 2004), ITuJ1, SanFrancisco, 2004 May.
S. Nakagawa, K. Okamura, T. Honjo, K. Yamaoka, K. B. Ishikawa, H. Ohno, N. Yamaguichi, "Evaluation of the Multimedia-Multicast-Mobile-Terminal for Patient Care at Hospital", The 12th International Conference on Information Networking(ICOIN-12), 369-374, Tokyo, Jan. 1998.