Publications

List of Publications

2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003

2023

Multistate interferometric measurement of the nonlinear ac Stark shift
Junnosuke Takai, Kosuke Shibata, Naota Sekiguchi, and Takuya Hirano, Physical Review A 107, 053308 (2023).
Highly efficient measurement of optical quadrature squeezing using a spatial light modulator controlled by machine learning
Jorge Amari, Junnosuke Takai, and Takuya Hirano, Optics Continuum 2, 933-941 (2023).

2022

Security against Collective Attacks for a Continuous-Variable Quantum Key Distribution Protocol Using Homodyne Detection and Postselection
Ryo Namiki J. Phys. Soc. Jpn. 92, 014001 (2023).
Improved waveguide-based ultraviolet light generation and pulsed squeezing at 795 nm
Aki Torii, Kosuke Shibata, Yujiro Eto, and Takuya Hirano Optics Express 30, 26120-26135 (2022).

2021

Quantum lock-in detection of a vector light shift
Kosuke Shibata, Naota Sekiguchi, and Takuya Hirano Phys. Rev. A 103, 043335 (2021).
Effect of cascaded nonlinear phase shift on pulsed second-harmonic generation using periodically poled waveguide: a comparison of experimental and numerical results
Yujiro Eto and Takuya Hirano, Jpn. J. Appl. Phys 60, 052001 (2021).

2019

Compensation of gravity on cold atoms by a linear optical potential
Kosuke Shibata, Hidehiko Ikeda, Ryota Suzuki, and Takuya Hirano Phys. Rev. Research 2, 013068 (2020).
Faraday patterns generated by Rabi oscillation in a binary Bose-Einstein condensate
Terun Chen, Kosuke Shibata, Yujiro Eto, Takuya Hirano, and Hiroki Saito Phys. Rev. A, 100, 063610 (2019).
Interaction modulation in a long-lived Bose-Einstein condensate by rf coupling
Kosuke Shibata, Aki Torii, Hitoshi Shibayama, Yujiro Eto, Hiroki Saito, and Takuya Hirano Phys. Rev. A 99, 013622 (2019).
Pulse-resolved measurement of continuous-variable Einstein-Podolsky-Rosen entanglement with shaped local oscillators
Ami Shinjo, Yujiro Eto, and Takuya Hirano Optics Express,Vol. 27,17610-17619 (2019).
Dissipation-Assisted Coherence Formation in a Spinor Quantum Gas
Yujiro Eto, Hitoshi Shibayama, Kosuke Shibata, Aki Torii, Keita Nabeta, Hiroki Saito, and Takuya Hirano Phys. Rev. Lett.122, 245301(2019).

2018

Wavelength division multiplexing of continuous variable quantum key distribution and 18.3 Tbit/s data channels
Tobias A. Eriksson, Takuya Hirano, Benjamin J. Puttnam, Georg Rademacher, Ruben S. Luís, Mikio Fujiwara, Ryo Namiki, Yoshinari Awaji, Masahiro Takeoka, Naoya Wada & Masahide Sasaki Communications Physics 2(1), 9 (2019).
Secret key rate of a continuous-variable quantum-key-distribution scheme when the detection process is inaccessible to eavesdroppers
Ryo Namiki, Akira Kitagawa, and Takuya Hirano, Phys. Rev. A 98, 042319 (2018).
Corrigendum: Non-equilibrium dynamics induced by miscible-immiscible transition in binary Bose-Einstein condensates
Yujiro Eto, Masahiro Takahashi, Masaya Kunimi, Hiroki Saito and Takuya Hirano New Journal of Physics, 20, 019501 (2018).
Ground-state phases of a mixture of spin-1 and spin-2 Bose-Einstein condensates
Naoki Irikura, Yujiro Eto, Takuya Hirano, and Hiroki Saito Phys. Rev. A 97, 023622(2018).
Spinor dynamics in a mixture of spin-1 and spin-2 Bose-Einstein condensates
Yujiro Eto, Hitoshi Shibayama, Hiroki Saito, and Takuya Hirano Phys. Rev. A 97, 021602(R) (2018).

2017

Erratum: Bouncing motion and penetration dynamics in multicomponent Bose-Einstein condensates
Yujiro Eto, Masahiro Takahashi, Keita Nabeta, Ryotaro Okada, Masaya Kunimi, Hiroki Saito, and Takuya Hirano Phys. Rev. A 96, 069904(2017).
Notes on a Continuous-Variable Quantum Key Distribution Scheme
Tsubasa Ichikawa, Takuya Hirano, Takuto Matsubara, Motoharu Ono, Ryo Namiki Journal of the Physical Society of Japan.86(9),094001(2017).
Loading of atoms into an optical trap with high initial phase-space density
Kosuke Shibata, Shota Yonekawa, and Satoshi Tojo, Phys. Rev. A 96, 013402 (2017) .
Excitation enhancement in electric multipole transitions near a nanoedge
Kosuke Shibata, Satoshi Tojo, and Daniel Bloch, Optics Express.Vol.25,9476-9489(2017).
QAM Quantum Noise Stream Cipher Transmission Over 100 km With Continuous Variable Quantum Key Distribution
Masataka Nakazawa,Masato Yoshida,Toshihiko Hirooka,Keisuke Kasai,Takuya Hirano,Tsubasa Ichikawa,Ryo Namiki, IEEE Journal of Quantum Electronics ( Volume: 53, Issue: 4, Aug. 2017 ) .
Implementation of continuous-variable quantum key distribution with discrete modulation
Takuya Hirano1, Tsubasa Ichikawa1, Takuto Matsubara1, Motoharu Ono1, Yusuke Oguri1, Ryo Namiki1, Kenta Kasai2, Ryutaroh Matsumoto3 and Toyohiro Tsurumaru4 , Quantum Science and Technology, 024010(2017).

2016

Converting separable conditions to entanglement-breaking conditions
Ryo Namiki, Phys. Rev. A 94, 042331 (2016).
Role of syndrome information on a one-way quantum repeater using teleportation-based error correction
Ryo Namiki, Liang Jiang, Jungsang Kim, and Norbert Lutkenhaus, Phys. Rev. A 94, 052304 (2016).
Multi-partite squash operation and its application to device-independent quantum key distribution
Toyohiro Tsurumaru and Tsubasa Ichikawa, New Journal of Physics 18, 103043 (2016).
Non-equilibrium dynamics induced by miscible-immiscible transition in binary Bose-Einstein condensates
Yujiro Eto, Masahiro Takahashi, Masaya Kunimi, Hiroki Saito, and Takuya Hirano New Journal of Physics 17, 073029 (2016).
Bouncing motion and penetration dynamics in multicomponent Bose-Einstein condensates
Yujiro Eto, Masahiro Takahashi, Keita Nabeta, Ryotaro Okada, Masaya Kunimi, Hiroki Saito, and Takuya Hirano Physical Review A 93, 033615 (2016) .

2015

Experimental realization of a spatially separated entanglement with continuous variable using laser pulse trains
Yun Zhang, Ryuhi Okubo, Mayumi Hirano, Yujiro Eto, and Takuya Hirano Scientific Reports5, 13029/1-8(2015).
Suppression of relative flow by multiple domains in two component Bose-Einstein condensates
Yujiro Eto, Masaya Kunimi,Hidekatsu Tokita,Hiroki Saito, and Takuya Hirano Physical Review A 92, 013611/1-5(2015).

2014

Construction of Arbitrary Robust One-Qubit Operations using Planar Geometry
Tsubasa Ichikawa, Jefferson G. Filgueiras, Masamitsu Bando, Yasushi Kondo, Mikio Nakahara and Dieter Suter Phys. Rev. A 90,052330/1-6 (2014).
Control of spin current in a Bose gas by bang-bang pulses
Yujiro Eto, Mark Sadgrove, Sho Hasegawa, Hiroki Saito, and Takuya Hirano arXiv:1405.0347
Observation of dipole-induced spin texture in an ⁸⁷Rb spin-2 Bose-Einstein condensate
Yujiro Eto, Hiroki Saito, and Takuya Hirano Phys. Rev. Lett. 112, 1835301 (2014).
Ultrabroadband direct detection of nonclassical photon statistics at telecom wavelength
Kentaro Wakui, Yujiro Eto, Hugo Benichi, Tetsufumi Yanagida, Shuro Izumi, Kazuhiro Ema, Takayuki Numata, Daiji Fukuda, Masahiro Takeoka, and Masahide Sasaki Scientific Reports 4, 4535 (2014)

2013

Spin-echo-based magnetometry with spinor Bose-Einstein condensates
Yujiro Eto, Hayato Ikeda, Hirosuke Suzuki, Sho Hasegawa, Yasushi Tomiyama, Sawako Sekine, Mark Sadgrove, and Takuya Hirano Phys. Rev. A 88, 031602(R) (2013).
Ramsey Interferometry Using the Zeeman Sublevels in a Spin-2 Bose Gas
Mark Sadgrove, Yujiro Eto, Sawako Sekine, Hirosuke Suzuki, and Takuya Hirano Journal of the Physical Society of Japan 82, 094002 (2013).
Quantum tele-amplification with a continuous-variable superposition state
Jonas S. Neergaard-Nielsen, Yujiro Eto, Chang-Woo Lee, Hyunseok Jeong, and Masahide Sasaki Nature Photonics 7, 439-443 (2013).
Control and Detection of the Larmor Precession of F=2 ⁸⁷Rb Bose・instein Condensates by Ramsey Interferometry and Spin-Echo
Yujiro Eto, Sawako Sekine, Sho Hasegawa, Mark Sadgrove, Hiroki Saito, and Takuya Hirano Applied Physics Express 6, 052801 (2013).

2012

Temporal Characteristics of Pulsed Squeezing in a Nonlinear Optical Waveguide
Yujiro Eto, Akane Koshio, Akito Ohshiro, Yun Zhang, Masahide Sasaki, and Takuya Hirano Japanese Journal of Applied Physics 52, 048001 (2013).
Collective Excitation of Bose-Einstein Condensates Induced by Evaporative Cooling
T. Kuwamoto and T. Hirano Journal of the Physical Society of Japan 81, 074002 (2012).

2011

Efficient homodyne measurement of picosecond squeezed pulses with pulse shaping technique
Yujiro Eto, Akane Koshio, Akito Ohshiro, Junichi Sakurai, Keiko Horie, Takuya Hirano, and Masahide Sasaki Optics Letters 36, 4653-4655 (2011).
Projective Measurement of a Single Nuclear Spin Qubit by Using Two-Mode Cavity QED
Yujiro Eto, Atsushi Noguchi, Peng Zhang, Masahito Ueda, and Mikio Kozuma, Physical Review Letters 106, 160501 (2011).
Transporting continuous quantum variables of individual light pulses
Yujiro Eto, Yun Zhang, and Takuya Hirano, Optics Express 19, 1360-1366 (2011).

2010

Controlling phase separation of binary Bose-Einstein condensates via mixed-spin-channel Feshbach resonance
Satoshi Tojo, Yoshihisa Taguchi, Yuta Masuyama, Taro Hayashi, Hiroki Saito, and Takuya Hirano, Physical Review A 82, 033609 (2010).
Dynamics of Quadruply Quantized Vortices in ⁸⁷Rb Bose-Einstein Condensates Confined in Magnetic and Optical Traps
Takeshi Kuwamoto, Hayato Usuda, Satoshi Tojo, and Takuya Hirano, Journal of the Physical Society of Japan 79, 034004 (2010).

2009

Spin-dependent inelastic collisions in spin-2 Bose-Einstein condensates
Satoshi Tojo, Taro Hayashi, Tatsuyoshi Tanabe, Takuya Hirano, Yuki Kawaguchi, Hiroki Saito, and Masahito Ueda, Physical Review A 80, 042704 (2009).
(selected by Virtual Journal of Atomic Quantum Fluids, vol 1, Issue 5.)
Stable generation of quadrature entanglement using a ring interferometer
Yujiro Eto, Akihiro Nonaka, Yun Zhang, and Takuya Hirano, Physical Review A 79, 050302(R) (2009).

2008

Collision dynamics between stretched states of spin-2 ⁸⁷Rb Bose-Einstein condensates
S. Tojo, A. Tomiyama, M. Iwata, T. Kuwamoto, and T. Hirano, Applied Physics B 92, 403-407 (2008).
Pulse-resolved measurement of quadrature phase amplitudes of squeezed pulse trains at a repetition rate of 76 MHz
Ryuhi Okubo, Mayumi Hirano, Yun Zhang, and Takuya Hirano, Optics Letters 33, 1458-1460 (2008).
Observation of quadrature squeezing in a χ(2) nonlinear waveguide using a temporally shaped local oscillator pulse
Yujiro Eto, Takashi Tajima, Yun Zhang, and Takuya Hirano, Optics Express 16, 10650-16657 (2008).
Hyperfine-structure-induced purely long-range molecules
Katsunari Enomoto, Masaaki Kitagawa, Satoshi Tojo, and Yoshiro Takahashi, Physical Review Letters 100, 123001 (2008).

2007

Experimental generation of broadband quadrature entanglement using laser pulses
Yun Zhang, Tatsuya Furuta, Ryuhi Okubo, Kosuke Takahashi, and Takuya Hirano, Physical Review A 76, 012314 (2007).
Observation of squeezed light at 1.535μm using a pulsed homodyne detector
Yujiro Eto, Takashi Tajima, Yun Zhang, and Takuya Hirano, Optics Letters 32, 1698-1700 (2007).
Determination of the s-Wave Scattering Length and the C₆ van der Waals Coefficient of ¹⁷⁴Yb via Photoassociation Spectroscopy
K. Enomoto, M. Kitagawa, K. Kasa, S. Tojo, and Y. Takahashi, Physical Review Letters 98, 203201 (2007).

2006

Efficient-phase-encoding protocols for continuous-variable quantum key distribution using coherent states and postselection
Ryo Namiki and Takuya Hirano, Physical Review A 74, 032302 (2006)
Pulsed Homodyne Detection of Squeezed Light at Telecommunication Wavelength
Yujiro Eto, Takashi Tajima, Yun Zhang and Takuya Hirano, Japanese Journal of Applied Physics, 45 L821-L823 (2006).
Practical implementation of continuous-variable quantum key distribution
Takuya Hirano, Atsushi Shimoguchia, Kazuya Shirasakia, Shingo Tokunagaa, Atsushi Furukia, Yohei Kawamoto, and Ryo namiki, Proceedings of SPIE Volume: 6244, Quantum Information and Computation IV, ISBN: 0-8194-6300-0, Publication Date: Jun 2006.

2005

Security of continuous-variable quantum cryptography using coherent states: Decline of postselection advantage
Ryo Namiki and Takuya Hirano, Physical Review A 72, 024301 (2005).
3 dB squeezing by single-pass parametric amplification in a periodically poled KTiOPO₄ crystal
T. Hirano, K. Kotani, T. Ishibashi, S. Okude, T. Kuwamoto, Optics Letters 30, 1722-1724, (2005).

2004

Magnetic field dependence of the dynamics of ⁸⁷Rb spin-2 Bose-Einstein condensates
T. Kuwamoto, K. Araki, T. Eno, and T. Hirano, Physical Review A 69, 063604 (2004).
Practical Limitation for Continuous-Variable Quantum Cryptography using Coherent States
R. Namiki, T. Hirano, Physical Review Letters 92, 117901 (2004).

2003

Quantum cryptography using pulsed homodyne detection
T. Hirano, H. Yamanaka, M. Ashikaga, T. Konishi, and R. Namiki, Physical Review A 68, 042331 (2003).
Quantum key distribution with a single photon from a squeezed coherent state
Masahiro Matsuoka and Takuya Hirano, Physical Review A 67, 042307 (2003).
Security of quantum cryptography using balanced homodyne detection
R. Namiki, T. Hirano, Physical Review A 67, 022308 (2003).

2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003

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TEL: +81-3-5992-1107
(Faculty Office)
FAX: +81-3-5992-1029
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Dept. of Physics
Gakushuin Univ.y
1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan

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