To Japanese presentations, publications and media coverages

- 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. Appl. 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. Rieffel, H. Takesue and 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).
- Y. Yamamoto, M. Sasaki, and H. Takesue, "Quantum information science and technology in Japan ," Quantum Sci. Technol. 4, 020502 (2019).
- F. Böhm, T. Inagaki, K. Inaba, T. Honjo, K. Enbutsu, T. Umeki, R. Kasahara, and H. Takesue, "Understanding dynamics of coherent Ising machines through simulation of large-scale 2D Ising models," Nat. Commun. 9, 5020 (2018).
- H. P. Lo, T. Ikuta, N. Matsuda, T. Honjo, and H. Takesue, ``Entanglement generation using a controlled-phase gate for time-bin qubits," Appl. Phys. Express 11, 092801 (2018)
- E. Kuramochi, N. Matsuda, K. Nozaki, A. H. K. Park, H. Takesue, and M. Notomi, "Wideband slow short-pulse propagation in one-thousand slantingly coupled L3 photonic crystal nanocavities," Opt. Express 26 (8), pp. 9552-9564 (2018).
- T. Ikuta and H. Takesue, "Four-dimensional entanglement distribution over 100 km," Sci. Rep. 8, 817 (2018).
- Y. Takeda, S. Tamate, Y. Yamamoto, H. Takesue, T. Inagaki, and S. Utsunomiya, “Bolzmann sampling for an XY model using a non-degenerate optical parametric oscillator network,” Quantum Sci. Technol. 3, 014004 (2018).
- Y. Yamamoto, K. Aihara, T. Leleu, K. Kawarabayashi, S. Kako, M. Fejer, K. Inoue, and H. Takesue, "Coherent Ising machines-optical neural networks operating at the quantum limit," npj Quantum Information 3, 49 (2017) (invited review article).
- N. Matsuda, H. Nishi, P. Karkus, T. Tsuchizawa, K. Yamada, W. J. Munro, K. Shimizu and H. Takesue, "Generation of entangled photons using an arrayed waveguide grating," J. Opt. 19, 124005 (2017).
- H. P. Lo and H. Takesue, "Precise tuning of single-photon frequency using an optical single sideband modulator," Optica 4 (8), 919-923 (2017).
- T. Ikuta and H. Takesue, "Implementation of quantum state tomography for time-bin qudits," New J. Phys. 19 (1), 013039 (2017).
- T. Inagaki, Y. Haribara, K. Igarashi, T. Sonobe, S. Tamate, T. Honjo, A. Marandi, P. L. McMahon, T. Umeki, K. Enbutsu, O. Tadanaga, H. Takenouchi, K. Aihara, K. Kawarabayashi, K. Inoue, S. Utsunomiya, and H. Takesue, "A coherent Ising machine for 2000-node optimization problems," Science Vol. 354, Issue 6312, pp. 603-606 (2016) DOI: 10.1126/science.aah4243.
- P. L. McMahon, A. Marandi, Y. Haribara, R. Hamerly, C. Langrock, S. Tamate, T. Inagaki, H. Takesue, S. Utsunomiya, K. Aihara, R. L. Byer, M. M. Fejer, H. Mabuchi, and Y. Yamamoto, "A fully-programmable 100-spin coherent Ising machine with all-to-all connections," Science Vol. 354, Issue 6312, pp. 614-617 (2016) DOI: 10.1126/science.aah5178.
- H. Takesue and T. Inagaki, "10 GHz clock time-multiplexed degenerate optical parametric oscillators for a photonic Ising spin network," Opt. Lett. 41, 4273-4276 (2016).
- R. Hamerly, K. Inaba, T. Inagaki, H. Takesue, Y. Yamamoto, and H. Mabuchi, "Topological defect formation in 1D and 2D spin chains realized by network of optical parametric oscillators," Int. J. Mod. Phys. B 30, 1630014 (2016).
- N. Matsuda and H. Takesue, "Generation and manipulation of entangled photons on silicon chips," Nanophotonics (2016). doi: 10.1515/nanoph-2015-0148 (invited review paper)
- T. Inagaki, K. Inaba, R. Hamerly, K. Inoue, Y. Yamamoto, and H. Takesue, "Large-scale Ising spin network based on degenerate optical parametric oscillators," Nature Photonics 10, 415-419 (2016). doi:10.1038/nphoton.2016.68
- T. Ikuta and H. Takesue, "Enhanced violation of the Collins-Gisin-Linden-Massar-Popescu inequality with optimized time-bin-entangled ququarts," Phys. Rev. A 93, 022307 (2016).
- H. Takesue, S. D. Dyer, M. J. Stevens, V. Verma, R. P. Mirin, and S. W. Nam, "Quantum teleportation over 100 km of fiber using highly efficient superconducting nanowire single-photon detectors," Optica 2, 832-835 (2015)
- H. Takesue, T. Sasaki, K. Tamaki, and M. Koashi, "Experimental quantum key distribution without monitoring signal disturbance," Nature Photonics 9, 827-831(2015) doi:10.1038/nphoton.2015.173.
- H. Shibata, K. Shimizu, H. Takesue, and Y. Tokura, "Ultimate low system dark-count rate for superconducting nanowire single-photon detector," Opt. Lett. 40, 3428-3431 (2015).
- N. Matsuda, P. Karkus, H. Nishi, T. Tsuchizawa, W. J. Munro, H. Takesue, K. Yamada, "On-chip generation and demultiplexing of quantum correlated photons using a silicon-silica monolithic photonic integration platform," Opt. Express 22, 22831-22840 (2014).
- H. Takesue, "Entangling time-bin qubits with a switch," Phys. Rev. A 89, 062328 (2014).
- N. Matsuda, E. Kuramochi, H. Takesue and M. Notomi, "Dispersion and light transport characteristics of large-scale photonic-crystal coupled nanocavity arrays," Opt. Lett. 39, 2290-2293 (2014).
- H. Takesue, N. Matsuda, E. Kuramochi, and M. Notomi, "Entangled photons from on-chip slow light," Scientific Reports 4, 3913 (2014): doi: 10.1038/srep03913.
- H. Takesue, N. Matsuda, E. Kuramochi, W. J. Munro, and M. Notomi, "An on-chip coupled resonator optical waveguide single-photon buffer," Nature Communications 4, 2725 (2013): doi:10.1038/ncomms3725.
- T. Inagaki, N. Matsuda, O. Tadanaga, M. Asobe, and H. Takesue, "Entanglement distribution over 300 km of fiber," Opt. Express 21, 23241-23249 (2013).
The content of this paper was introduced in
*MIT Technology Review*and*ExtremeTech.* - H. Shibata, K. Shimizu, H. Takesue, and Y. Tokura, "Superconducting nanowire single-photon detector with ultralow dark count rate using cold optical filters," Appl. Phys. Express 6, 072801 (2013).
- N. Matsuda, H. Takesue, K. Shimizu, Y. Tokura, E. Kuramochi, and M. Notomi, "Slow light enhanced correlated photon pair generation in photonic-crystal coupled-resonator optical waveguides," Opt. Express 21, 8596-8604 (2013).
- N. Matsuda, H. Le Jeannic, H. Fukuda, T. Tsuchizawa, W. J. Munro, K. Shimizu, K. Yamada, Y. Tokura, and H. Takesue, "A monolithically integrated polarization entangled photon pair source on a silicon chip," Scientific Reports 2, 817 (2012).
- H. Takesue, "Entangled photon pair generation using silicon wire waveguides," IEEE J. Selected Topics in Quantum Electronics 18, 1722-1732 (2012) (invited paper).
- N. Matsuda, T. Kato, K. Harada, H. Takesue, E. Kuramochi, H. Taniyama, and M. Notomi, "Slow light enhanced optical nonlinearity in a silicon photonic crystal coupled-resonator optical waveguide," Opt. Express 19, 19861-19874 (2011).
- K. Harada, H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura and S. Itabashi, "Indistinguishable photon pair generation using two independent silicon wire waveguides," New J. Phys. 13, 065005 (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).
- M. Sasaki, M. Fujiwara, H. Ishizuka, W. Klaus, K. Wakui, M. Takeoka, S. Miki, T. Yamashita, Z. Wang, 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).
- 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).
- T. Seki, H. Shibata, H. Takesue, Y. Tokura, and N. Imoto, "Comparison of timing jitter between NbN superconducting single-photon detector and avalanche photodiode," Physica C 470, 1534-1537 (2010).
- H. Takesue, "Single-photon frequency down-conversion experiment," Phys. Rev. A 82, 013833 (2010).
- H. Takesue, K. Harada, K. Tamaki, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, and S. Itabashi, "Long-distance entanglement-based quantum key distribution experiment using practical detectors," Opt. Express 18, 16777-16787 (2010).
- Q. Zhang, H. Takesue, C. Langrock, Xiuping Xie, M. M. Fejer, and Y. Yamamoto, "Hong-Ou-Mandel dip using degenerate photon pairs from a single periodically poled lithium niobate waveguide with integrated mode demultiplexer," Jpn. J. Appl. Phys. 49 064401 (2010).
- 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) (invited paper).
- M. Hunault, H. Takesue, O. Tadanaga, Y. Nishida, and M. Asobe, "Generation of time-bin entangled photon pairs by cascaded second-order nonlinearity in a single periodically poled LiNbO3 waveguide," Opt. Lett. 35, 1239-1241 (2010).
- H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "Entanglement generation using silicon wire waveguide," Optics and Spectroscopy 108, 160-164 (2010).
- H. Takesue, K. Harada, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "Entanglement generation using silicon photonic wire waveguide," J. Nanosci. Nanotechnol. 10, 1814-1818 (2010) (invited paper).
- K. Harada, H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "Frequency and polarization characteristics of correlated photon-pair generation using a silicon wire waveguide," IEEE J. Selected Topics in Quantum Electronics 16, 325-331 (2010).
- H. Takesue and K. Shimizu, "Effects of multiple pairs on visibility measurements of entangled photons generated by spontaneous parametric processes," Opt. Commun. 283, 276-287 (2010).
- H. Shibata, M. Asahi, T. Maruyama, T. Akazaki, H. Takesue, T. Honjo, and Y. Tokura, "Optical response and fabrication of MgB2 nanowire," IEEE Transactions on applied 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 and Y. Noguchi, "Implementation of quantum state tomography for time-bin entangled photon pairs," Opt. Express 17, 10976-10989 (2009).
- H. Takesue and B. Miquel, "Entanglement swapping using telecom-band photons generated in fibers," Opt. Express 17, 10748-10756 (2009).
- H. Takesue, T. Honjo, K. Tamaki, and Y. Tokura, "Differential phase shift quantum key distribution," IEEE Communications Magazine 47, 102 (2009) (invited paper).
- 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). This paper was chosen as "IOP Select".
- B. Miquel and H. Takesue, "Observation of 1.5 μm band entanglement using single photon detectors based on sinusoidally gated InGaAs/InP avalanche photodiodes," New J. Phys. 11, 045006 (2009).
- K. Harada, H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "Generation of high-purity entangled photon pairs using silicon wire waveguide," Opt. Express 16, 20368-20373 (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," Opt. Express 16, 19118-19126 (2008).
- H. Takesue, "Erasing distinguishability using quantum frequency up-conversion," Phys. Rev. Lett. 101, 173901 (2008).
- K. Inoue, T. Ohashi, T. Kukita, K. Watanabe, S. Hayashi, T. Honjo, and H. Takesue, "Differential-phase-shift quantum secret sharing," Opt. Express 16, 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 (2008).
- Q. Zhang, H. Takesue, S. W. Nam, C. Langrock, X. Xie, B. Baek, M. M. Fejer, and Y. Yamamoto, "Distribution of time-energy entanglement over 100 km fiber using superconducting singlephoton detectors," Opt. Express 16, 5776-5781 (2008).
- H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "Generation of polarization entangled photon pairs using silicon wire waveguide," Opt. Express 16, 5721-5727 (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, 639-641 (2008).
- Q. Zhang, C. Langrock, H. Takesue, X. Xie, M. M. Fejer, and Y. Yamamoto, "Generation of 10-GHz clock sequential time-bin entanglement," Opt. Express 16, 3293-3298 (2008).
- H. Takesue, Y. Tokura, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, and S. Itabashi, "Entanglement generation using silicon wire waveguide," Appl. Phys. Lett. 91, 201108 (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, 13957-13964 (2007).
- Q. Zhang, X. Xie, H. Takesue, S. W. Nam, C. Langrock, M. M. Fejer, and Y. Yamamoto, "Correlated photon-pair generation in reverse-proton-exchange PPLN waveguides with integrated mode demultiplexer at 10 GHz clock," Opt. Express 15, 10288-10293 (2007).
- N. Namekata, G. Fujii, S. Inoue, T. Honjo and H. Takesue, "Differential phase shift 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).
- H. Takesue, "1.5-um band Hong-Ou-Mandel experiment using photon pairs generated in two independent dispersion shifted fibers," Appl. Phys. Lett. 90, 204101 (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, 1165-1167 (2007).
- T. Honjo, H. Takesue and K. Inoue, "Generation of energy-time entangled photon pairs in 1.5-um band with periodically poled lithium niobate waveguide," Opt. Express 15, 1679-1683 (2007).
- E. Diamanti, H. Takesue, C. Langrock, M. M. Fejer and Y. Yamamoto, "100 km differential phase shift quantum key distribution experiment with low
jitter up-conversion detectors," Opt. Express 14, 13073-13082 (2006). The content of this paper was introduced in
*New Scientist.* - H. Takesue, E. Diamanti, C. Langrock, M. M. Fejer and Y. Yamamoto, "1.5-um single photon counting using polarization-independent up-conversion detector," Opt. Express 14, 13067-13072 (2006).
- H. Takesue, E. Diamanti, C. Langrock, M. M. Fejer and Y. Yamamoto, "10-GHz clock differential phase shift quantum key distribution experiment,"
Opt. Express 14, 9522-9530 (2006). The content of this paper was introduced in
*Nature Photonics.* - H. Takesue and K. Inoue, "Quantum secret sharing based on modulated high-dimensional time-bin entanglement," Phys. Rev. A 74, 012315 (2006).
- H. Takesue, T. Honjo, and H. Kamada, "Differential phase shift quantum key distribution using 1.3-um up-conversion detectors," Jpn. J. Appl. Phys. 45, 5757 (2006).
- H. Takesue, N. Yoshimoto, Y. Shibata, T. Ito, Y. Tohmori and T. Sugie, "Wavelength channel data rewriter using semiconductor optical saturator / modulator," J. Lightwave Technol. 24, 2347 (2006).
- H. Takesue, "Long-distance distribution of time-bin entanglement generated in a cooled fiber," Opt. Express 14, 3453-3460 (2006).
- K. Inoue and H. Takesue, "Quantum key distribution using entangled-photon trains with no basis selection," Phys. Rev. A 73, 032332 (2006).
- E. Diamanti, C. Langrock, M. M. Fejer, Y. Yamamoto and H. Takesue, "1.5-um photon-counting optical time domain reflectometry with a single-photon detector using up-conversion in a PPLN waveguide," Opt. Lett. 31, 727 (2006).
- E. Waks, H. Takesue and Y. Yamamoto, "Security of differential-phase-shift quantum key distribution against individual attacks," Phys. Rev. A 73, 012344 (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).
- H. Takesue and K. Inoue, "Generation of 1.5-um band time-bin entanglement using spontaneous fiber four-wave mixing and planar lightwave circuit interferometers," Phys. Rev. A 72, 041804(R) (2005).
- H. Takesue and K. Inoue, "1.5-um band quantum-correlated photon pair generation in dispersion-shifted fiber: suppression of noise photons by cooling fiber," Opt. Express, 13, 7832-7839 (2005).
- Y. Katagiri, H. Takesue, E. Hashimoto, "Wavelength-scanning optical bandpass filters based on optomechatronics for optical frequency sweepers," IEEE Trans. Industrial Electron., 52, 992 (2005).
- C. Langrock, E. Diamanti, R. V. Roussev, Y. Yamamoto, M. M. Fejer, and H. Takesue, "Highly efficient single-photon detection at communication wavelengths by use of upconversion in reverse-proton-exchanged periodically poled LiNbO3 waveguides," Opt. Lett., 30, 1725 (2005).
- H. Takesue, K. Inoue, O. Tadanaga, Y. Nishida, and M. Asobe, "Generation of pulsed polarization-entangled photon pairs in a 1.55-um band with a periodically poled lithium niobate waveguide and an orthogonal polarization delay circuit," Opt. Lett., 30, 293 (2005).
- H. Takesue and K. Inoue, "Generation of polarization entangled photon pairs and violation of Bell's inequality using spontaneous four-wave mixing in a fiber loop," Phys. Rev. A 70, 031802(R) (2004).
- H. Takesue and T. Horiguchi, "Broadband lightwave synthesized frequency sweeper using synchronous filtering," IEEE J. Lightwave Technol., Vol. 22, No. 3, pp. 755-762, 2004.
- H. Takesue and T. Sugie, "Wavelength channel data rewrite using saturated SOA modulator for WDM networks with centralized light sources," IEEE J. Lightwave Technol., Vol. 21, No. 11, pp. 2546-2556, 2003.
- H. Takesue, T. Horiguchi and T. Kobayashi, "Numerical simulation of a lightwave synthesized frequency sweeper incorporating an optical SSB modulator composed of four optical phase modulators," IEEE J. Lightwave Technol., Vol. 20, No. 11, pp. 1908-1917, 2002.
- T. Sato, F. Yamamoto, K. Tsuji, H. Takesue, and T. Horiguchi, "An uncooled external cavity diode laser for coarse-WDM access network systems," IEEE Photon. Technol. Lett., Vol. 14, No. 7, pp. 1001-1003, 2002.
- H. Takesue and T. Horiguchi, "Chromatic dispersion measurement of optical components using lightwave synthesized frequency sweeper," IEEE J. Lightwave Technol., Vol. 20, No. 4, pp. 625-633, 2002.
- H. Takesue, F. Yamamoto and T. Sugie, "Novel node configuration for DWDM photonic access ring using CMLS," IEEE Photon. Technol. Lett., Vol. 12, No. 12, pp. 1698-1700, 2000.
- H. Takesue, F. Yamamoto and T. Horiguchi, "Fast and accurate measurement of WDM components using lightwave synthesised frequency sweeper," Electron. Lett., Vol. 36, No. 12, pp. 1047-1048, 2000.
- H. Takesue, F. Yamamoto, and T. Horiguchi, "Stable lightwave synthesized frequency sweeper using Fabry-Perot cavity composed of Faraday rotator mirrors," IEEE J. Lightwave Technol., Vol. 18, No. 3, pp. 375-383, 2000.
- H. Takesue, F. Yamamoto, and T. Horiguchi, "Stable lightwave frequency synthesis over 1-THz span using Fabry-Perot cavity containing polarization-rotation elements and actively controlled tunable bandpass filter," IEEE Photon. Technol. Lett. Vol. 12, No. 1, pp. 79-81, 2000.
- H. Takesue, F. Yamamoto, K. Shimizu and T. Horiguchi, "Stable lightwave frequency synthesiser using discrete-time negative frequency feedback with polarisation diversity technique," Electron. Lett., Vol. 35, No. 7, pp. 594-595, 1999.
- H. Takesue, F. Yamamoto, K. Shimizu and T. Horiguchi, "Stabilization of pulsed lightwave circulating around an amplified fiber-optic ring incorporating a Lyot depolarizer," IEEE Photon. Technol. Lett., Vol. 10, No. 12, pp. 1748-1750, 1998.
- H. Takesue, F. Yamamoto, K. Shimizu and T. Horiguchi, "1 THz lightwave synthesised frequency sweeper with synchronously tuned bandpass filter," Electron. Lett., Vol. 34, No. 15, pp. 1507-1508, 1998.

- H. Takesue, "Computation with optica oscillator networks," Optical Fiber Communication Conference (OFC 2020), W4E.3, March 11, 2020, San Diego, talk given through web meeting because of travel ban due to COVID-19 (invited).
- H. Takesue, "Quantum communication experiments with optical waveguide devices," International Symposium on Photonics and Electronics Convergence (ISPEC 2019), November 27, 2019, The University of Tokyo (invited).
- H. Takesue, "A coherent Ising machine based on degenerate optical parametric oscillators for combinatorial optimization," International Symposium on Frontier Issues in Quantum Physics and Quantum Information Sciences (QPQIS2019), November 25, Beijing, China (invited).
- J. Arai, S.Yagi, H. Uchiyama,T. Honjo, T.Inagaki, K. Inaba, T. Ikuta, H. Takesue, K. Horikawa, "Hybrid Computing Platform for Combinatorial Optimization with the Coherent Ising Machine," The International Conference for High Performance Computing, Networking, Storage, and Analysis (SC19), Poser 85, November 20, 2019, Denver.
- H. P. Lo, T. Ikuta, N. Matsuda, T. Honjo, 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 (invited).
- H. Takesue, "Coherent Ising machine for solving combinatorial optimization problems," International Conference on Emerging Quantum Technology (ICEQT 2019), September 17, 2019, Hejei, China (invited).
- 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 (invited).
- 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," 19th Asian Quantum Information Science Conference (AQIS), poster 47, August 20,2019, Seoul, Korea.
- 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.
- H. Ito, Y. Murata, K. Kurasawa, M. Jing, M. Hasegawa, H. Yasuda, K. Aihara and H. Takesue, " Application of Quantum Neural Network to Resource Assignment Problems in Wireless Communication," International Conference on Multimedia Information Technology and Applications, June 28, 2019.
- H. Takesue, "Coherent Ising machine: a photonic computer using network of degenerate optical parametric oscillators," seminar talk at Toronto University, May 16, 2019, Toronto, Canada (Seminar series talk at University of Toronto chapters of the SPIE and OSA, invited).
- 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, P19, March 19, 2019, Atsugi.
- 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).
- H. Takesue, "Quantum optics research at NTT: quantum communication and coherent Ising machine," seminar talk at Malaviya National Institute of Technology Jaipur, March 1, 2019, Jaipur, India (invited, IEEE Distinguished Lecturer Talk).
- H. Takesue, "Coherent Ising machine: an Ising-model solver based on degenerate optical parametric oscillators," seminar talk at University of California Santa Barbara, January 18, 2019, Santa Barbara, CA (invited, IEEE Distinguished Lecturer Talk).
- K. Kurasawa, H. Ito, J. Ma, H. Takesue, K. Aihara and M. Hasegawa, "Parameter setting for mutually connected neural network running on coherent Ising machine," 7th Japan-Korea Joint Workshop on Complex Communication Sciences, January 8, 2019.
- 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, "Coherent Ising machine: an Ising-model solver based on degenerate optical parametric oscillators," 23rd Annual Symposium of the IEEE Photonics Sociecty Benelux Chapter, November 16, 2018, Vrije Universitait Brussel, Brussel, Belgium (invited, IEEE Distinguished Lecturer Talk).
- H. Takesue, "Coherent Ising machine: an Ising-model solver based on degenerate optical parametric oscillators," seminar talk at London University, October 19, 2018, London, UK (invited, IEEE Distinguished Lecturer Talk).
- H. Takesue, "Quantum communication experiments with optical waveguide devices," International Conference on Integrated Quantum Photonics (ICIQP) 2018, October 17, 2018, Paris, France (invited).
- H. Takesue, "Quantum communication experiments with telecom-band photonics technologies," Frontiers in Optics and Laser Science (FiO + LS 2018), FTh3D.3, September 18, 2018, Washington DC (invited).
- H. Ito, Y. Murata, K. Kuroda, H. Takesue, K. Aihara, and M. Hasegawa, "Performance analysis of a coherent Ising machine with hardware constraints," International Symposium on Nonlinear Theory and Its Applications, September 2, 2018.
- H. P. Lo, T. Ikuta, N. Matsuda, T. Honjo, and H. Takesue, "Demonstration of controlled-phase gate for time-bin qubits," CLEO Pacific Rim 2018, W2G.5, August 1, 2018, Hong Kong.
- H. Takesue, "Coherent Ising machine: an Ising-model solver based on degenerate optical parametric oscillators," International Nano-Optoelectronics Workshop (iNOW) 2018, July 23, 2018, Berkeley, CA (invited).
- H. Takesue, "Coherent Ising machine: a photonic Ising-model solver based on network of optical parametric oscillators," JST Workshop : Novel frontiers of optics for computing, July 18, 2018, Tokyo (invited).
- H. Takesue and T. Ikuta, "Long-distance quantum teleportation and high-dimensional entanglement distribution over optical fiber," IEEE Summer Topicals 2018, WD2.2, July 11, 2018, Waikoloa, Hawaii (invited).
- H. Takesue, "Integrated quantum photonics and coherent Ising machine," Advances in Quantum Engineering International Meeting 2018, June 25, 2018, Singapore (invited).
- R. Hamerly, T. Inagaki, P. L. McMahon, D. Venturelli, A. Marandi, T. Onodera, E. Ng, E. Rieffel, M. M. Fejer, S. Utsunomiya, H. Takesue, and Y. Yamamoto, "Quantum vs. optical annealing: benchmarking the OPO Ising machine and D-Wave," CLEO:2018, FTu4A.2, May 15, 2018, San Jose.
- T. Honjo, T. Inagaki, K. Inaba, T. Ikuta, and H. Takesue, "Long-term stable operation of coherent Ising machine for cloud service," CLEO:2018, JTu2A.87, May 15, 2018, San Jose.
- N. Matsuda, E. Kuramochi, H. Takesue, M. Notomi, R. Kou, T. Tsuchizawa, K. Yamada, A. Ishizawa, "Slow-light- and graphene- enhanced nonlinearity of silicon waveguides," SPIE Photonics Europe, April 23, 2018, Strasbourg, France (invited).
- H. Takesue, "Degenerate optical parametric oscillators for solving Ising model," International Conference on Nano-photonics and Nano-optoelectronics (ICNN 2018), ICNN3-1, Optics and Photonics International Congress (OPIC) 2018, April 26, 2018, Yokohama (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, April 24, 2018, Yokohama (invited).
- P. McMahon, A. Marandi, R. Hamerly, E. Ng, T. Onodera, Y. Haribara, C. Langrock, D. Venturelli, E. Rieffel, S. Tamate, T. Inagaki, H. Takesue, S. Utsunomiya, K. Aihara, R. Byer, M. Fejer, H. Mabuchi, and Y. Yamamoto, "Progress on coherent Ising machines constructed from optical parametric oscillators," APS March Meeting 2018, S28.00013, March 8, 2018, Los Angeles.
- H. Ito, Y. Murata, K. Kuroda, H. Takesue, and M. Hasegawa, "Performance Analysis of a Coherent Ising Machine with Real Machine Constraints," The 6th Korea-Japan Joint Workshop on Complex Communication Sciences, P39, January 10, 2018, Jozankei, Japan.
- 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), November 28, 2017, Hawaii (invited).
- H. Takesue, "Coherent Ising machine for solving complex optimization problems," International School and Symposium on Nanoscale Transport and Photonics (ISNTT) 2017, 8th BRL School, Lecture 3, November 13, 2017, Atsugi (invited lecture).
- Y. Takeda, S. Tamate, Y. Yamamoto, H. Takesue, T. Inagaki, S. Utsunomiya, “Bolzmann sampling for an XY model using a non-degenerate optical parametric oscillator network,” FM4E.3, September 18, 2017, Washington DC.
- 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, September 7, 2017, Fukuoka (invited).
- H. P. Lo and H. Takesue, "Erasing frequency distinguishability of single photons using optical single sideband modulator," CLEO Pacific Rim 2017, Oral 2-4O-3, August 2, 2017, Singapore.
- 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, August 2, 2017, Singapore (invited).
- H. Takesue, T. Ikuta, H. P. Lo, and N. Matsuda, "Integrated photonic circuits for time-bin encoded quantum information systems," The 8th International Conference on Metamaterials, Photonics Crystals and Plasmonics (META'17), July 28, 2017, Incheon, South Korea (invited).
- P. L. McMahon, A. Marandi, Y. Haribara, R. Hamerly, C. Langrock, S. Tamate, T. Inagaki, H. Takesue, S. Utsunomiya, K. Aihara, R. L. Byer, M. M. Fejer, H. Mabuchi, and Y. Yamamoto, "Combinatorial optimization using networks of optical parametric oscillators," Nonlinear Optics (NLO) 2017, MN2B.2, July 17, 2017,Waikoloa, Hawaii.
- N. Matsuda, E. Kuramochi, H. Takesue, K. Shimizu, M. Notomi, "Resonant Photon Pair Generation from Coupled Silicon Photonic Crystal Nanocavities," CLEO/Europe-EQEC 2017, CK-8.4, June 27, 2017, Munich
- H. Takesue, "Artificial spin network based on coupled optical parametric oscillators for solving Ising model," Spintech IX, INV6, June 7, 2017, Fukuoka, Japan (invited).
- T. Ikuta and H. Takesue, "Distribution of four-dimensional time-bin entangled state over 100 km of fiber," CLEO:2017, FTh4E.7, May 18, 2017, San Jose.
- H. Takesue, "Information processing with quantum optics," Workshop on Advancing Communication and Quantum Information Research in Engineering (ACQUIRE), May 6, 2017, San Jose (invited).
- T. Inagaki, Y. Haribara, K. Igarashi, T. Sonobe, S. Tamate, T. Honjo, A. Marandi, P. L. McMahon, T. Umeki, K. Enbutsu, O. Tadanaga, H. Takenouchi, K. Aihara, K. Kawarabayashi, K. Inoue, S. Utsunomiya, H. Takesue, "A coherent Ising machine based on networked optical parametric oscillators for optimization problems," Information Photonics, IP-19PM-1-1, April 19, 2017, Yokohama (invited).
- H. Takesue, "Solving combinatorial optimization problems with coherent Ising machine," The first annual symposium on Quantum Science and Quantum Engineering, April 6, 2017, Wurzburg, Germany (invited).
- H. Takesue, T. Inagaki, K. Inaba, R. Hamerly, K. Inoue, and Y. Yamamoto, "Large-scale artificial spin network based on time-multiplexed degenerate optical parametric oscillators for coherent Ising machine," SPIE Photonics West 2017, 10088-36, February 1, 2017, San Francisco (invited).
- N. Matsuda, H. Nishi, P. Karkus, T. Tsuchizawa, K. Yamada, W. J. Munro, K. Shimizu, H. Takesue, "Generation of path-entangled photons using an arrayed waveguide grating," Frontiers in Optics/Laser Science (FiO/LS) 2016, FW3F.6, Octorber 19, 2016, Rochester, NY.
- H. Takesue, "Emerging quantum information technologies -quantum for sustaining the Moore's law-," Solid State Devices and Materials (SSDM) 2016, Rump Session B, September 28, 2016, Tsukuba (invited panelist).
- H. Takesue, T. Sasaki, K. Tamaki, and M. Koashi, "Round-robin differential phase shift quantum key distribution experiment," Trustworthy Quantum Information 2016, June 28, 2016, Shanghai, China (invited).
- H. Takesue and T. Inagaki, "10-GHz clock time-multiplexed degenerate optical parametric oscillators for coherent Ising machine," CLEO:2016, STh3F.4, June 9, 2016, San Jose.
- H. Takesue, "Towards large scale coherent Ising machine," US-Japan Workshop; New-Generation Computers: Quantum Annealing and Coherent Computing, December 10, 2015, Stanford (invited).
- T. Ikuta and H. Takesue, "Violation of the CGLMP inequality with entangled time-bin ququarts," 5th International Conference on Quantum Cryptography (QCrypt 2015), poster 109, September 29, 2015, Tokyo.
- T. Inagaki, K. Inoue, Y. Yamamoto, and H. Takesue, "Simulating one-dimensional Ising spins with optically-coupled timedivision-multiplexed optical parametric oscillators," Nonlinear Optics (NLO) 2015, NTu1B.6, July 28, 2015, Kauai, Hawaii.
- H. Takesue, T. Inagaki, K. Inoue, and Y. Yamamoto, "Time-division-multiplexed degenerate optical parametric oscillator for a coherent Ising machine," IEEE Summer Topicals 2015, TuF4.2, July 14, 2015, Nassau, Bahamas (invited).
- S. D. Dyer, H. Takesue, M. J. Stevens, V. Verma, R. Horansky, R. P. Mirin, and S. W. Nam, "High-performance superconducting nanowire single-photon detectors: metrology and application to quantum teleportation," Single Photon Workshop 2015, Poster 7, July 14, 2015, Geneva, Switzerland.
- E. Kuramochi, N. Matsuda, K. Nozaki, H. Takesue, and M. Notomi, "Over-1mm-long wideband on-chip slowlight waveguides realized by 1,000 coupled L3 nanocavities," CLEO:2015, SF2H.1, May 15, 2015, San Jose.
- S. D. Dyer, H. Takesue, V. Verma, R. Horansky, R. P. Mirin, and S. W. Nam, "Polarization-insensitive superconducting nanowire single-photon detectors," CLEO:2015, FF2A.4, May 15, 2015, San Jose.
- H. Takesue, S. D. Dyer, M. J. Stevens, V. Verma, R. P. Mirin, and S. W. Nam, "Quantum teleportation over 100 km of fiber using MoSi superconducting nanowire single-photon detectors," CLEO:2015, FF1A.4, May 15, 2015, San Jose.
- H. Takesue, "Quantum photonics and communication using silicon devices," Topical Workshop on Nonlinear Quantum Photonics, February 25, 2015, Sydney (invited).
- T. Inagaki, T. Imai, J. Miyazu, H. Takesue and J. Kobayashi, “Low-voltage optical phase modulation by electric-field-induced phase transition of KTN Bulk crystal,” IEEE Photonics Conference (IPC) 2014, WB2.2, Oct. 15, 2014, La Jolla, CA.
- N. Matsuda, P. Karkus, H. Nishi, T. Tsuchizawa, W. Munro, H. Takesue, K. Yamada, "On-chip generation and demultiplexing of quantum correlated photons using silicon-silica monolithic waveguide platform," ECOC 2014, Tu.4.7.4, Sep. 23, 2014, Cannes, France.
- H. Takesue, "A time-bin qubit entangler based on photon switching," CLEO:2014, FTh1A, June 12, 2014, San Jose.
- E. Kuramochi, A. Park, N. Matsuda, H. Takesue, M. Notomi, "Large-scale slanted arrays of high-Q coupled Si L3 nanocavities," PECS-XI, O-15, May 13, 2014, Shanghai, China.
- H. Shibata, K. Shimizu, T. Honjo, H. Takesue, Y. Tokura, "Fabrication of ultralow noise SSPD and long distance QKD experiment," International Symposium on Nanoscale Transport and Technology 2013, PTu4, November 26, 2013, Atsugi.
- H. Takesue, N. Matsuda, E. Kuramochi, M. Notomi, "Entangled photon pair generation using on-chip slow light," Single Photon Workshop 2013, October 17, 2013, Oak Ridge.
- H. Shibata, K. Shimizu, H. Takesue, Y. Tokura, "Superconducting nanowire single-photon detector with ultra-low dark count rate," International Superconductive Electronics Conference 2013, July 7, 2013, Boston.
- N. Matsuda, H. Le Jeannic, H. Fukuda, T. Tsuchizawa, W. J. Munro, K. Shimizu, K. Yamada, and H. Takesue, "Monolithic source of telecom-band polarization entanglement on a silicon photonic chip," CLEO-PR & OECC/PS 2013, ThM1-1, July 4, 2013, Kyoto (invited).
- T. Inagaki, N. Matsuda, O. Tadanaga, Y. Nishida, M. Asobe, and H. Takesue, "Long distance distribution of entangled photon pair over 300 km of fiber," CLEO:2013, QTu2C.2, June 11, 2013, San Jose.
- H. Takesue, N. Matsuda, E. Kuramochi, M. Notomi, "Integrated single photon buffer based on coupled-resonator optical waveguide," CLEO:2013, QTu1C.5, June 11, 2013, San Jose.
- N. Matsuda, H. Takesue, K. Shimizu, Y. Tokura, E. Kuramochi, M. Notomi, "Slow-light-enhanced correlated photon pair generation in a silicon photonic crystal coupled-resonator optical waveguide," CLEO/Europe-IQEC 2013 IA-6.4, May 15, 2013, Munich, Germany.
- N. Matsuda, E. Kuramochi, H. Takesue, K. Shimizu, Y. Tokura, M. Notomi, "Ultra-narrowband nonlinear wavelength conversion using coupled photonic crystal nanocavities," CLEO/Europe-IQEC 2013,CK-1.5, May 12, 2013, Munich, Germany (invited).
- N. Matsuda, H. Le Jeannic, H. Fukuda, T. Tsuchizawa, K. Yamada, Y. Tokura, and H. Takesue "Polarization-entangled photon pair source on a chip," 2012 IEEE 9th International Conference on Group IV Photonics (GFP), ThP9, Aug 30, 2012, San Diego, CA.
- H. Le Jeannic, N. Matsuda, H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, S. Itabashi, and Y. Tokura, "Monolithically-integrated polarization-entangled photon pair source on a silicon-on-insulator photonic circuit," CLEO:2012, QF2F.2, San Jose, California.
- H. Takesue, "Quantum communication experiments using superconducting single-photon detectors," International Workshop on Nanowire Superconducting Single-Photon Detectors (NSSPD), September 23, 2011, Eindhoven, Netherlands (invited).
- N. Matsuda, T. Kato, K. Harada, H. Takesue, E. Kuramochi, M. Notomi, "Slow light enhanced waveguide nonlinearity in ultrahigh-Q photonic crystal coupled resonator chain," Microopics Conference (MOC) 2011, October 31, 2011, Sendai.
- H. Takesue, "Entanglement generation using silicon wire waveguide," IEEE Summer Topicals 2011, MA3.3, July 18, 2011, Montreal, Canada (invited).
- N. Matsuda, T. Kato, K. Harada, H. Takesue, E. Kuramochi, and M. Notomi, "Highly-efficient four-wave mixing in a couplednanocavity waveguide," CLEO/QELS 2011, CFI3, May 6, 2011, Baltimore.
- 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/QELS 2011, JTuC3, May 3, 2011, Baltimore.
- H. Takesue, "Single-photon frequency downconversion experiment," Photonics Global Conference 2010, 3-4A-2, December 16, Singapore (invited).
- H. Takesue, "Quantum frequency downconversion experiment", Inernational conference on quantum communication, measurement and computing, QCMC 2010, P3-1, July 22, 2010, Brisbane, Australia.
- M. Hunault, H. Takesue, O. Tadanaga, Y. Nishida, and M. Asobe, "Generation of time-bin entangled photon pairs using cascaded second-order nonlinearity in single periodically-poled lithium niobate waveguide," CLEO/QELS 2010, QThG4, May20, 2010, San Jose.
- K. Inoue, H. Takesue and A. Yoshizawa, ``Quantum entangled photons and quantum key distribution," 2010 International Symposium on Physics of Quantum Technology, Talk No.26, April 9, 2010, Tokyo.
- 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, "Entanglement distribution over 200 km," 2010 International Symposium on Physics of Quantum Technology, 8TH-54, April 8, 2010, Tokyo.
- H. Takesue, "Erasing frequency distinguishability using quantum frequency up-conversion," 2010 International Symposium on Physics of Quantum Technology, 8TH-8, April 8, 2010, Tokyo.
- H. Takesue, "Quantum communication experiments using telecom-band entangled photons", International Conference on Quantum Information and Technology (ICQIT) 2009, December 3, 2009, Tokyo (invited).
- 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 fiber using self-differencing InGaAs avalanche photodiodes," Frontiers in optics 2009, JWE2, October 14, 2009, San Jose.
- K. Yamada, T. Tsuchizawa, T. Watanabe, H. Fukuda, H. Shinojima, H. Nishi, K. Harada, H. Takesue Y. Tokura, and S. Itabashi, "Nonlinear functions and quantum entanglement generation using silicon photonic wire waveguides," ECOC 2009, session 7.2, September 23, 2009, Vienna (invited).
- H. Takesue, K. Harada, K. Tamaki, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, and S. Itabashi, "Unconditionally secure entanglement-based quantum key distribution experiment," Conference on Quantum Information & Quantum Control (CQIQC) III, Session 10, August 27, 2009, Toronto, Canada.
- 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, "Ulta-long distance and efficient entanglement distribution over 200 kilometers," CLEO/IQES 2009, postdeadline paper IPDA7, June 4, 2009, Baltimore.
- H. Takesue, "Erasing frequency distinguishability using single-photon up-conversion," CLEO/IQEC 2009, IThJ7, June 4, 2009, Baltimore.
- K. Shimizu, H. Takesue and K. Tamaki, "Two-photon interference for quantum cryptography with a non-maximally entangled photon pair," CLEO/IQEC 2009, IWC6, June 3, 2009, Baltimore.
- 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, ITul1, June 2, 2009, Baltimore.
- H. Takesue, K. Harada, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "Silicon photonics in quantum communications," CLEO/IQEC 2009, CMAA1, June 1, 2009, Baltimore (invited).
- H. Takesue, "Telecom-band entanglement swapping using high-speed single photon detectors based on sinusoidally gated InGaAs/InP avalanche photodiodes," SPIE Defence, Security + Sensing 2009, Advanced Photon Counting Techniques III, 7320-29 (invited).
- K. Inoue, H. Takesue and T. Honjo, "DPS quantum key distribution and related technologies" , SPIE Photonic West, 7236-16, 2009.
- K. Harada, H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "Frequency and polarization characteristics of correlated photon-pair generation in silicon wire waveguide," International Symposium on Nanoscale Transport and Technology 2009, ISNTT 2009, PWe-10, January 21, 2009, Atsugi, Japan.
- Q. Zhang, H. Takesue, T. Honjo, K. Wen, T. Hirohata, M. Suyama, Y. Takiguchi, H. Kamada, Y. Tokura, O. Tadanaga, Y. Nishida, M. Asobe, S. W. Nam, R. H. Hadfield, K. Tamaki, K. Inoue, Y. Yamamoto, "Experimental research status of differential phase shifted quantum key distribution," International Symposium on Physics of Quantum Technology 2008, TH-E6, November 27, 2008, Nara.
- K. Harada, H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "High-purity entanglement generation using silicon wire waveguide," International Symposium on Physics of Quantum Technology 2008, TH-E3, November 27, 2008, Nara.
- 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," International Symposium on Physics of Quantum Technology 2008, TH-E2, November 27, 2008, Nara.
- H. Takesue and B. Miquel, "Swapping telecom-band entanglement generatedin fibers, International Symposium on Physics of Quantum Technology 2008, TH-E1, November 27, 2008, Nara.
- H. Takesue and T. Honjo, "Quantum communication experiments using telecom-band entangled photons," LEOS Annual Meeting 2008, ThG4, November 13, 2008, Newport Beach, California (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, Oct 10, 2008, Vienna, Austria, 2008.
- K. Yamada, T. Tsuchizawa, T. Watanabe, H. Fukuda, H. Shinojima, H. Nishi, H. Takesue, T. Tanabe, A. Shinya, E. Kuramochi, M. Notomi, Y. Tokura, S. Itabashi, "Applications of nonlinear effects in silicon wire waveguides: all-optical modulation, wavelength conversion, and quantum entanglement," SPIE Asia-Pacific Optical Communications, APOC 2008, Paper 7134-64, October 28, 2008, Hangzhou, China (invited).
- H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "Entanglement generation using silicon photonic wire waveguide," The 2nd IEEE Nanotechnology Materials and Devices Conference, NMDC 2008, MoC II-3, October 20, 2008, Kyoto (invited).
- H. Takesue, K. Harada, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "Entanglement generation using silicon wire waveguide," XII International Conference on Quantum Optics and Quantum Information, ICQO 2008, September 22, 2008, Vilnius, Lithuania (invited).
- H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "Entanglement generation using silicon wire waveguide," 5th International Conference on Group IV Photonics, GFP 2008, FD1, September 19, 2008, Sorrento, Italy (invited).
- K. Harada, H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "High-purity entanglement generation using silicon wire waveguide," 8th Asian Conference on Quantum Information Science, AQIS 2008, August 30, 2008, Seoul.
- H. Takesue, "Swapping telecom-band entanglement generated in fibers," 8th Asian Conference on Quantum Information Science, AQIS 2008, August 30, 2008, Seoul.
- H. Shibata, M. Asahi, T. Maruyama, T. Akazaki, H. Takesue, T. Honjo, Y. Tokura, "Optical Response and Fabrication of MgB2 Nanowire Detectors," 2008 Applied Superconductivity Conference, ASC 2008, 3EPD02, August 20, 2008, Chicago.
- B. Baek, S. W. Nam, D. Rosenberg, J.E. Nordholt, H. Takesue, Y. Yamamoto, M. Sasaki, A. Tomita, "Application of superconducting single photon detector technology to practical quantum key distribution systems," 2008 Applied Superconductivity Conference, ASC 2008, 2EY06, August 19, 2008, Chicago.
- 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, 2008 (Invited).
- 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.
- H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura, and S. Itabashi, "Generation of 1.5-um band polarization entanglement using silicon wire waveguide," CLEO/QELS 2008, QFE3, May 9, 2008, San Jose.
- Q. Zhang, H. Takesue, C. Langrock, X. Xie, M. M. Fejer, and Y. Yamamoto, "Hong-Ou-Mandel dip using photon pairs from a PPLN waveguide," CLEO/QELS 2008, QFE1, May 9, 2008, San Jose.
- T. Honjo, S. W. Nam, H. Takesue, Q. Zhang, H. Kamada, Y. Nishida, O. Tadanaga, M. Asobe, B. Baek, R. H. 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, May 7, 2008, San Jose.
- H. Takesue, "Quantum communication experiments using entangled photons generated in dispersion shifted fiber," IEEE/LEOS Winter Topicals, January 15, 2008, Sorrento, Italy (invited).
- H. Takesue, "R&D of quantum relay technology at NTT," Updating Quantum Cryptography, UQC 2007, October 3, 2007, Tokyo (invited).
- H. Takesue, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, Y. Tokura and S. Itabashi, "Entanglement generation using silicon wire waveguide," Eur. Conf. Opt. Commun. ECOC 2007, postdeadline paper 2.3, September 20, 2007, Berlin.
- K. Inoue, H. Takesue and T. Honjo, "Differential-phase-shift quantum key distribution", SPIE Optics East, 6780-39, Boston, 2007 (invited).
- N. Namekata, G. Fujii, T. Honjo, H. Takesue and S. Inoue, "Quantum key distribution using single-photon detectors based on sinusoidally gated InGaAs/InP avalanche photodiodes", CLEO/Pacific Rim 2007, postdeadline paper PDPA-5.
- T. Honjo, H. Takesue, H. Kamada, Y. Nishida, O. Tadanaga, M. Asobe, K. Inoue, "Long-distance distribution of time-bin entangled photon pairs over 100 km using frequency up-conversion detectors," The 16th laser physics workshop, LPHY' 07, paper 7.7.2 (invited).
- X. Xie, Q. Zhang, C. Langrock, Y. Yamamoto, M. M. Fejer, H. Takesue, and S. W. Nam, "Photon pair generation in reverse-proton-exchange lithium niobate waveguides with mode demultiplexing at a pump repetition rate of 10 GHz," CLEO/QELS 2007, QWF4.
- H. Takesue, "1.5-μm band Hong-Ou-Mandel experiment using photon pairs generated in two independent optical fibers," CLEO/QELS 2007, JTuA5.
- K. Inoue, H. Takesue and T. Honjo, "Differential phase shift quantum key distribution using single-photon detectors," OFC 2007, OWT2 (invited).
- H. Takesue, E. Diamanti, C. Langrock, M. M. Fejer, and Y. Yamamoto, "100 km secure key distribution using low-jitter up-conversion detectors," The 8th inernational conference on quantum communication, measurement and computing, QCMC '06, SA4-2.
- K. Inoue and H. Takesue, "Generation of entangled photons in fiber and their system applications," Frontier in Optics 2006, FTuR1 (invited).
- Y. Yamamoto, E. Diamanti, H. Takesue, C. Langrock, and M. M. Fejer, "Differential phase shift quantum key distribution," Conference on quantum information and quantum control II, 2006 (invited).
- T. Honjo, H. Takesue and K. Inoue, "Differential-phase quantum key distribution experiment using a series of quantum entangled photon pairs," The 15th laser physics workshop, LPHY' 06, paper 7.7.5.
- 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 (invited).
- K. Inoue, H. Takesue and T. Honjo, "Differential-phase-shift quantum key distribution," IEEE/LEOS Summer Topicals 2006, TuB1.2 (invited).
- E. Diamanti, C. Langrock, E. Waks, 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.
- T. Honjo, H. Takesue and K. Inoue, " Generation of energy-time entangled photon pairs in 1.5-um band with periodically poled lithium niobate waveguide," CLEO/QELS 2006, JTuA5.
- H. Takesue, "Long-distance distribution of time-bin entangled photon pairs generated in optical fiber cooled by liquid nitrogen," CLEO/QELS 2006, JTuA3.
- 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 2006, OFL2.
- E. Diamanti, C. Langrock, M. M. Fejer, Y. Yamamoto and H. Takesue, "1.5 um photon-counting optical time domain reflectometry with a single-photon detector using up-conversion in a PPLN waveguide," CLEO/QELS 2005, CTuY6.
- C. Langrock, E. Diamanti, R. V. Roussev, Y. Yamamoto, M. M. Fejer and H. Takesue, "Higly efficient single-photon detection at communication wavelengths using upconversion in reverse proton exchanged PPLN waveguides," CLEO/QELS 2005, QThJ1.
- H. Takesue and K. Inoue, "Generation of polarization entangled photon pairs using spontaneous four-wave mixing in fiber loop," The 7th inernational conference on quantum communication, measurement and computing, QCMC '04, P3.18.
- H. Takesue, N. Yoshimoto, T. Ito, Y. Tohmori and T. Sugie, "2.5-Gbit/s wavelength channel data rewriter using semiconductor optical saturator/modulator for drop-and-rewrite WDM networks," in Proc. Eur. Conf. Opt. Commun. ECOC 2003, paper Th2.3.3.
- H. Takesue and T. Sugie, "Data rewrite of wavelength channel using saturated SOA modulator for WDM metro/access networks with centralized light sources," in Proc. Eur. Conf. Opt. Commun. ECOC 2002, paper 8.5.6.
- T. Sato, H. Takesue and T. Sugie, "Photonic access and metropolitan area networks for broadband services," 4th International Conf. on Transparent Optical Networks, 2002. ,Vol.1, pp.21-25, April 2002.
- H. Takesue and T. Horiguchi, "1-THz offset frequency measurement using lightwave synthesized frequency sweeper," in Proc. Microwave Photon. Conf. MWP 2002.
- H. Takesue and T. Horiguchi, "Very fast chromatic dispersion measurement using lightwave synthesized frequency sweeper and lock-in detection with phase diversity technique," in Proc. Opt. Fiber Commun. Conf. OFC 2001, paper WDD87.
- H. Takesue, F. Yamamoto and T. Horiguchi, "Stable lightwave synthesized frequency sweeper for the 1.5 um band," in Proc. Eur. Conf. Opt. Commun. ECOC’98, paper WdA33.

- S. Saito, H. Takesue, and H. Gotoh, "Initiatives for new computers using quantum technology," New Breeze, Winter 2019, pp.12-15 (2019).
- H. Takesue, T. Inagaki, and T. Honjo, "Solving complex optimization problems with a coherent Ising machine," SPIE Newsroom DOI: 10.1117/2.1201702.006859 (2017).
- H. Takesue, "Applications of superconducting single photon detectors to quantum communications," The Journal of the Institute of Electronics, Information and Communication Engineers 99, 229-234 (2016) (in Japanese).
- H. Takesue, "Experimental quantum cryptography without error rate monitoring," The Journal of the Institute of Electronics, Information and Communication Engineers 99, 158-159 (2016) (in Japanese).
- H. Takesue, "Quantum communication experiments over optical fiber," in Principles and Methods of Quantum Information Technologies (eds. Y. Yamamoto and K. Semba), 53-70, Springer (2016).
- H. Takesue, E. Diamanti, R. Thew, and Z. Yuan, "Introduction to the Issue on Quantum Communication and Cryptography," IEEE J. Selected Topics in Quantum Electronics 21, 0200402 (2015).
- H. Takesue, "Integrated quantum optical circuits on silicon chips," OYO BUTSURI 84, 434-437 (2015) (in Japanese).
- T. Inagaki and H. Takesue, "Distribution of entangled photon pairs over 300 km of optical fiber," NTT Technical Review 12, No. 9 (2014).
- N. Matsuda, H. Takesue, W. J. Munro, E. Kuramochi, and M. Notomi, "Photonic quantum information devices using coupled-resonator optical waveguides," NTT Technical Review 12, No.9 (2014).
- H. Takesue, "An on-chip quantum buffer: a key component for a photonic quantum computer on a chip," The Journal of the Institute of Electronics, Information and Communication Engineers 97, 144 (2014) (in Japanese).
- N. Matsuda, H. Fukuda, T. Tsuchizawa, W. J. Munro, K. Shimizu, K. Yamada, Y. Tokura, H. Takesue, "Monolithic integration of polarization-entangled photon pair source using silicon photonics technology," NTT Technical Review 11, No. 8 (2013).
- H. Takesue, "Quantum communication experiments in telecommunication bands," Optical and Electro-Optical Engineering Contact 51, No. 5, pp. 22-27 (2013) (in Japanese).
- H. Takesue, "Quantum communication using entangled photon pairs?toward quantum repeaters," NTT Technical Review 9, No. 9 (2011).
- H. Takesue, K. Harada, Y. Tokura, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, and S. Itabashi, "Entanglement generation using silicon waveguide," Optronics 2011.2, No. 350, pp. 130-133 (2011) (in Japanese).
- H. Takesue, "Progress of quantum cryptography technologies and future perspective," OYO BUTSURI 78, 972 (2009) (in Japanese).
- H. Takesue, K. Harada, Y. Tokura, H. Fukuda, T. Tsuchizawa, T. Watanabe, K. Yamada, and S. Itabashi, "Entanglement generation using silicon wire waveguide," NTT Technical Review 8, No.2 (2010).
- H. Takesue, "Quantum cryptography," MAGUNE (Magnetics Japan) 4, 294 (2009) (in Japanese).
- H. Kamada, T. Tawara, T. Yamaguchi, T. Honjo, H. Takesue, Y. Nishida, O. Tadanaga, M. Asobe, and K. Inoue, "Single-photon and entangle photon pair generation and long-distance distribution in telecommunication bands," KOGAKU 37, 447 (2008) (in Japanese).
- H. Takesue, "‘Quantum key’ sent over 200 km of fiber using 10-GHz clock quantum cryptography system," The Journal of the Institute of Electronics, Information and Communication Engineers 90, 906 (2007) (in Japanese).
- H. Takesue, "Generation of entangled photon pairs in telecommunication wavelength band," OYO BUTSURI 75, 1354 (2006) (in Japanese).
- H. Takesue, "Generation of telecom-band quantum entangled photon pairs and its application to quantum key distribution, " Review of the National Institute of Information and Communications Technology 52, No. 3, p. 63 (2006) (in Japanese) / Journal of the National Institute of Information and Communications Technology 53, No.3, p. 69 (2006) (English translation).
- H. Takesue, "Generation of polarization entangled photon pairs in 1.5-um telecommunication band," NTT Gijyutsu Journal, 18, No. 2, 33 (2006) (in Japanese).
- H. Takesue,"Generation of polarization entangled photon pairs in 1.5-um telecommunication band," NTT Technical Review, 3, No. 12, 53 (2005).
- H. Takesue, H. Kawata, K. Hattori, S. Kuwano, Y. Fukada and T. Sugie, "Calculation of crosstalk penalty in hybrid ring systems for access/user networks," NTT R&D, 51, 1015 (2002) (in Japanese).

Japanese presentations, publications and media coverages