研究について

研究内容

• 半導体を中心としたナノサイエンス・メゾスコピック系の電気伝導、熱伝導
  • 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.
  • 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.
• 非平衡ダイナミクス、非平衡統計
  • Shunsuke Kamimura, Kyo Yoshida, Yasuhiro Tokura and Yuichiro Matsuzaki, "Universal Scaling Bounds on a Quantum Heat Current", Phys. Rev. Lett. 131, 090401 (2023).
  • S. Kamimura, H. Hakoshima, Y. Matsuzaki, K. Yoshida, Y. Tokura, "Quantum enhanced heat engine by superabsorption", Phys. Rev. Lett. 128, 180602 (2022).
  • 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).
  • 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).
• 量子ドット中の電子スピンを用いた量子情報処理
  • 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).
• ナノメカニクス
  • 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).
• 超伝導量子ビット、ドナー系など複合量子系のコヒーレンス
  • 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).
• 量子暗号・量子光学
  • Hiroto Kasai, Yuki Takeuchi, Hideaki Hakoshima, Yuichiro Matsuzaki, Yasuhiro Tokura, "Anonymous quantum sensing", J. Phys. Soc. Jpn. 91, 074005 (2022).
  • 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.

最近の成果

• Yasuhiro Tokura,
  "Microwave Power Dependence of Electric Dipole Spin Resonance ",
  physica status solidi B, 2025 2400550 (2025)
• Daigo Yoshino and Yasuhiro Tokura,
  "Voltage Fluctuation of CMOS NAND Gate Analysed with Large Deviations Theory".
  
• Tsuyoshi Yamamoto and Yasuhiro Tokura,
  "Thermal conductance at superradiant phase transition in quantum Rabi model",
  arXiv:2502.14447.
• Tsuyoshi Yamamoto and Yasuhiro Tokura,
  "Energy exchange and fluctuations between a dissipative qubit and a monitor under continuous measurement and feedback",
  SciPost Phys. Core 8, 016 (2025) arXiv:2409.09452.
• Toshiaki Hayashi, Yasuhiro Tokura, and Katsuhiko Nishiguchi,
  "Effective medium approximation for variable-range hopping",
  J. Phys. Soc. Jpn. 94, 044001 (2025).
• Toshiaki Hayashi, Hiroyuki Kageshima, Yasuhiro Tokura, Jin-Ichiro Noborisaka, and Katsuhiko Nishiguchi,
  "First-Principles Investigation of the Valley Splitting of Si Quantum Slabs",
  Phys. Status Solidi B 2024, 2400531.
• Hiroto Kasai, Yuki Takeuchi, Yuichiro Matsuzaki, Yasuhiro Tokura,
  "Direct moment estimation of intensity distribution of magnetic fields with quantum sensing network",
  New Journal of Physics. 26 (2024) 123013.
• K. Imakire, A. Oiwa, Y. Tokura,
  "Electron g-factor of strained Ge caused by the SiGe substrate and its dependence on growth directions",
  arXiv:2411.01148.
• Yasuhiro Tokura,
  "Electric dipole spin resonance with linear and cubic spin-orbit interaction",
  arXiv:2407.20632
• Tsuyoshi Yamamoto, Tsuyoshi Yamamoto, and Leonid I. Glazman,
  "Microwave spectroscopy of the Schmid transition",
  Phys. Rev. B 109, 155431 (2024) [Editors' Suggestion] | arXiv:2308.16072
• Manuel Houzet, Tsuyoshi Yamamoto, and Leonid I. Glazman,
  "Microwave spectroscopy of the Schmid transition",
  Phys. Rev. B 109, 155431 (2024) | arXiv:2308.16072
• Tsuyoshi Yamamoto and Yasuhiro Tokura,
  "Heat flow from a measurement apparatus monitoring a dissipative qubit",
  Phys. Rev. Research 6, 013300 (2024), arXiv:2310.02789
• Daigo Yoshino and Yasuhiro Tokura,
  "Thermodynamics of Computation for CMOS NAND Gate",
  J. Phys. Soc. Jpn. 92, 124004 (2023), Editor's Choice arXiv:2308.15738

研究室の卒業論文・学位論文

研究成果

参加プロジェクト等

• つくば量子情報サロン：筑波大、産総研、物質材料機構の有志でおこなっている活動です。
• 光・量子飛躍フラグシッププログラム(Q-LEAP)　量子計測・センシング技術領域（研究代表者　波多野睦子教授）H30-
• 科研費基盤（B)「揺らぎを活用した量子素子回路計算機の確立熱力学による性能評価」（研究代表者　内海裕洋准教授）R6-R9.
• ムーンショットプロジェクト、 「量子ビットをベースとする要素技術の研究開発」（プロジェクトマネージャー　小芦雅斗教授）R2-R7.
• 科研費基盤（C)「非平衡量子系の測定と制御に関する研究」（研究代表者　都倉）R5-R7.
• 科研費基盤（C)「量子ホールエッジ状態を用いたトポロジカル準粒子の測定と統計性」（研究代表者　久保敏弘准教授）R5-R7.
• 科研費基盤（S)「光子―スピン量子状態変換に基づく半導体スピン量子ビットの革新的量子中継技術の創製」（研究代表者　大岩顕教授）R5-R9.
• 科研費基盤（S)「IV族半導体量子構造におけるスピンコヒーレンス工学の開拓」（研究代表者　小寺哲夫教授）R5-R9.
• 終了プロジェクト

研究資料

• 朝永Luttingerモデル(revised on 2020 Feb.)
• 松原周波数を含む和に関する公式と応用(uploaded on 2023 Jan.)