Research

On our research

Main subjects and selected papers:

• Semiconductor nanoscience, electrical/thermal transport in mesoscopic system
  • Y. Tokura, `Quantum adiabatic pumping in Rashba-Dresselhaus-Aharonov-Bohm interferometer', Entropy 21, 828 (2019).
  • Ken-ichi Sasaki, Yasuhiro Tokura, `Theory of a Carbon-Nanotube Polarization Switch', Phys. Rev. Applied 9, 034018 (2018) Editor's suggestion, arXiv:1712.05557.
• Non-equilibirum statistical physics and dynamics
  • G. Giavaras and Yasuhiro Tokura, "Microwave spectroscopy of spin-orbit coupled states: energy detuning versus interdot coupling modulation", J. Appl. Phys. 128, 154304 (2020).
  • Satoshi Nakajima and Yasuhiro Tokura, `Excess entropy production in quantum system: Quantum master equation approach', J. Stat. Phys. Volume 169, Issue 5, pp 902-928 (2017), arXiv:1612.03527v2.
  • Y. Utsumi, O. Entin-Wohlman, A. Aharony, T. Kubo and Y. Tokura, `Fluctuation theorem for a two-terminal conductor connected to a thermal probe', Physica Scripta T165, 014021 (2015).
• Quantum information processing using electron spins in quantum dots
  • Seigo Tarucha, Michihisa Yamamoto, Akira Oiwa, Byung-Soo Choi, and Yasuhiro Tokura, `Spin Qubits with Semiconductor Quantum Dots', Chapter 25, "Principles and Methods of Quantum Information Technologies", Lecture Notes in Physics 911 (2016), Y. Yamamoto, K. Semba (eds.), DOI 10.1007/978-4-431-55756-2_25.
  • R. Brunner, Y. -S. Shin, T. Obata, M. Pioro-Laderiere, Y. Tokura, T. Kubo, K. Yoshida, T. Taniyama, and S. Tarucha, `Realization of a spin two-qubit gate with semiconductor quantum dots using an inhomogeneous Zeeman field' Phys. Rev. Lett. 107, 146801 (2011) also see the Viewpoint.
  • M. Pioro-Ladriere, T. Obata, Y. Tokura, Y. -S. Shin, T. Kubo, K. Yoshida, T. Taniyama, and S. Tarucha `Electrically Driven Single Electron Spin Resonance in a Slanting Zeeman Field', Nature Physics 4, 776 (2008).
• Nano-mechanics
  • N. Lambert, I. Mahboob, M. Pioro-Ladriere, Y. Tokura, S. Tarucha, and H. Yamaguchi, `Electron-Spin Manipulation and Resonator Readout in a Double-Quantum-Dot Nanoelectromechanical System' Phys. Rev. Lett., 100, 136802 (2008).
• Donner, superconductor qubits, coherence of the hybrid system
  • Yuichiro Matsuzaki, Takaaki Shimooka, Hirotaka Tanaka, Yasuhiro Tokura, Kouichi Semba, Norikazu Mizuochi, `Hybrid quantum magnetic field sensor with an electron spin and a nuclear spin in diamond', Phys. Rev. A 94, 052330 (2016)
  • Xiaobo Zhu, Shiro Saito, Alexander Kemp, Kosuke Kakuyanagi, Shinichi Karimoto, Hayato Nakano, William J. Munro, Yasuhiro Tokura, Mark Everitt, Kae Nemoto, Makoto Kasu, Norikazu Mizuochi, Kouichi Semba, `Coherent coupling of a superconducting flux-qubit to an electron spin ensemble in diamond' Nature 478, 221 (2011).
• Quantum key distribution and quantum optics
  • Nobuyuki Matsuda, Hanna Le Jeannic, Hiroshi Fukuda, Tai Tsuchizawa, William John Munro, Kaoru Shimizu, Koji Yamada, Yasuhiro Tokura, Hiroki Takesue, `A monolithically integrated polarization entangled photon pair source on a silicon chip' Scientific Reports, 2 817 (2012).
  • 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, A. Zeilinger, `Field test of quantum key distribution in the Tokyo QKD Network' Opt. Exp. 19, 10387-10409 (2011), arXiv:1103.3566.

Recent papers

• Tsuyoshi Yamamoto and Yasuhiro Tokura,
  "Heat flow from a measurement apparatus monitoring a dissipative qubit",
  arXiv:2310.02789
• Daigo Yoshino and Yasuhiro Tokura,
  "Thermodynamics of Computation for CMOS NAND Gate",
  arXiv:2308.15738
• Hiroto Kasai, Yuki Takeuchi, Yuichiro Matsuzaki, Yasuhiro Tokura,
  "Anonymous estimation of intensity distribution of magnetic fields with quantum sensing network",
  arXiv:2035.14119
• Kazuyuki Kuroyama, Sadashige Matsuo, Seigo Tarucha, Yasuhiro Tokura,
  "Phonon-mediated spin dynamics in a two-electron double quantum dot under a phonon temperature gradient",
  Phys. Rev. B, 108, 115308 (2023), arXiv:2303.05700
• Toshiaki Hayashi, Yasuhiro Tokura, and Katsuhiko Nishiguchi,
  "Statistical properties of electric potentials in a variable-range hopping regime",
  J. Phys. Soc. Jpn. 92, 034001 (2023).
• Shunsuke Kamimura, Kyo Yoshida, Yasuhiro Tokura and Yuichiro Matsuzaki,
  "Universal Scaling Bounds on a Quantum Heat Current",
  Phys. Rev. Lett. 131, 090401 (2023) arXiv:2209.05789.
• Kyo Yoshida,
  "Ensemble model of turbulence based on states of constant flux in wavenumber space",
  Phys. Rev. E 106, 045106 (2022).
• Tsuyoshi Yamamoto, Yasuhiro Tokura, Takeo Kato,
  "Heat transport through a two-level system under continuous quantum measurement",
  Phys. Rev. B 106, 205419 (2022) arXiv:2208.08755.
• Yudai Ueki, Shunsuke Kamimura, Yuichiro Matsuzaki, Kyo Yoshida, Yasuhiro Tokura,
  "Quantum battery based on superabsorption",
  J. Phys. Soc. Jpn., 91, 124002 (2022) arXiv:2205.03823
• Kazuyuki Kuroyama, Sadashige Matsuo, Jo Muramoto, Shunsuke Yabunaka, Sasha R. Valentin, Arne Ludwig, Andreas D. Wieck, Yasuhiro Tokura, and Seigo Tarucha,
  "Real-time Observation of Charge-spin Cooperative Dynamics Driven by a Nonequilibrium Phonon Environment",
  Phys. Rev. Lett. 129, 095901 (2022) Selected as an Editor's choice. arXiv:2106.01576.
• Hiroto Kasai, Yuki Takeuchi, Hideaki Hakoshima, Yuichiro Matsuzaki, Yasuhiro Tokura,
  "Anonymous quantum sensing",
  J. Phys. Soc. Jpn. 91, 074005 (2022). arXiv:2105.05585.
• S. Kamimura, H. Hakoshima, Y. Matsuzaki, K. Yoshida, Y. Tokura,
  "Quantum enhanced heat engine by superabsorption",
  Phys. Rev. Lett. 128, 180602 (2022). arXiv:2106.10813.

Project

• Grant in Aid for Scientific Research (B) (Kakenhi) "Nonequilibrium statistical physics of information processing via small-scale quantum circuits" (Prof. Yasuhiro Utsumi, Mie Univeristy) 2020-2023.
• Moon shot project, "Research and development of key elements of quantum bits" (Prof. Masato Koashi, Tokyo University) 2020-2024.
• Grant in Aid for Scientific Research (C) "Research on measurement and control of non-equilibrium quantum system" (Yasuhiro Tokura) 2023-2025.
• Grant in Aid for Scientific Research (C) "Measurement topological quasi-particles and their statistics in quantum Hall edge states", (Prof. Toshihiro Kubo, Tsunan) 2024-2026.
• Grant in Aid for Scientific Research (S) "Novel quantum repeater technology with semiconductor spin qubit based on photon-spin quantum state transfer", (Prof. Akira Oiwa, Osaka U) 2023-2027.
• Grant in Aid for Scientific Research (S) "Spin coherence technology in IV group semiconductor quantum structures", (Prof. Tetsuo Kodera, Tokyo Institute of Technology) 2023-2027.

Related documents

• Tomonaga-Luttinger model(revised on 2020 Feb.)
• Sum rule and application including Matsubara frequency(uploaded on 2023 Jan.)

Contacts