研究紹介記事

• 2017年7月14日 RIKEN RESEARCH
  Physicists solve ETH Zurich quantum point contact mystery
  Near superfluid conditions prompt atoms to form pairs to pass through a narrow gate, finds a new mathematical
  　　　　analysis
  
• 2015年11月27日 RIKEN RESEARCH
  A sensitive approach to atom counting
  Measurements of scattered photons can be used to detect the number of atoms trapped in the troughs of an
  　　　　optical lattice
  
• 2015年3月20日 RIKEN RESEARCH
  The universal nature of three-body attraction
  A study of the interaction among three objects in peculiar resonant systems uncovers an unexpected universality
  
  
• 2015年01月28日 RIKEN RESEARCH
  Particles find their mass
  Simulations indicate that a peculiar state of matter at close to absolute zero could be used to observe an elusive
  　　　　quantum phenomenon called quantum mass acquisition

主要論文

• "Symmetry and Topology in Non-Hermitian Physics"
  Kohei Kawabata, Ken Shiozaki, Masahito Ueda, and Masatoshi Sato
  Phys. Rev. X 9, 041015 (2019)
• "Theory of Non-Hermitian Fermionic Superfluidity with a Complex-Valued Interaction"
  Kazuki Yamamoto, Masaya Nakagawa, Kyosuke Adachi, Kazuaki Takasan, Masahito Ueda, and Norio Kawakami
  Phys. Rev. Lett. 123, 123601 (2019)
  
• "Non-Hermitian Many-Body Localization"
  Ryusuke Hamazaki, Kohei Kawabata, and Masahito Ueda
  Phys. Rev. Lett. 123, 090603 (2019)
• "Floquet Chiral Magnetic Effect"
  Sho Higashikawa, Masaya Nakagawa, and Masahito Ueda
  Phys. Rev. Lett. 123, 066403 (2019)
• "Flemish Strings of Magnetic Solitons and a Nonthermal Fixed Point in a One-Dimensional Antiferromagnetic Spin-1 Bose Gas"
  Kazuya Fujimoto, Ryusuke Hamazaki, and Masahito Ueda 　　
  Phys. Rev. Lett. 122, 173001 (2019)
  
• "Second-Order Topological Phases in Non-Hermitian Systems"
  Tao Liu, Yu-Ran Zhang, Qing Ai, Zongping Gong, Kohei Kawabata, Masahito Ueda, and Franco Nori
  Phys. Rev. Lett. 122, 076801 (2019)
  
• "Topological unification of time-reversal and particle-hole symmetries in non-Hermitian physics"
  Kohei Kawabata, Sho Higashikawa, Zongping Gong, Yuto Ashida, and Masahito Ueda
  Nat. Commun. 10, 297 (2019)[selected as Editors' Highlights (Link)]
  
• Non-Hermitian Kondo Effect in Ultracold Alkaline-Earth Atoms
  Masaya Nakagawa, Norio Kawakami, and Masahito Ueda
  Phys. Rev. Lett. 121, 203001 (2018)
  
• "Thermalization and Heating Dynamics in Open Generic Many-Body Systems"
  Yuto Ashida, Keiji Saito, and Masahito Ueda
  Phys. Rev. Lett. 121, 170402 (2018)
• "Topological Phases of Non-Hermitian Systems"
  Zongping Gong, Yuto Ashida, Kohei Kawabata, Kazuaki Takasan, Sho Higashikawa and Masahito Ueda
  Phys. Rev. X 8, 031079 (2018)
  See also Viewpoint: Physics 11, 96 by Miguel A. Bandres and Mordechai Segev
  
• "Nonholonomy of order parameters and su(3) vortices in spin-1 Bose-Einstein condensates"
  Emi Yukawa and Masahito Ueda
  Phys. Rev. A 98, 013607 – Published 9 July 2018
• "Bound on the exponential growth rate of out-of-time-ordered correlators"
  Naoto Tsuji, Tomohiro Shitara, and Masahito Ueda
  Phys. Rev. E 98, 012216 – Published 30 July 2018
• "Full-Counting Many-Particle Dynamics: Nonlocal and Chiral Propagation of Correlations"
  Yuto Ashida and Masahito Ueda
  Phys. Rev. Lett. 120, 185301 – Published 4 May 2018
• "Quantum Szilard Engine with Attractively Interacting Bosons"
  J. Bengtsson, M. Nilsson Tengstrand, A. Wacker, P. Samuelsson, M. Ueda, H. Linke, and S. M. Reimann
  Phys. Rev. Lett. 120, 100601 – Published 9 March 2018
• "Unconventional Universality Class of One-Dimensional Isolated Coarsening Dynamics in a Spinor Bose Gas"
  Kazuya Fujimoto, Ryusuke Hamazaki, and Masahito Ueda
  Phys. Rev. Lett. 120, 073002 – Published 13 February 2018
• "Atypicality of Most Few-Body Observables"
  Ryusuke Hamazaki and Masahito Ueda
  Phys. Rev. Lett. 120, 080603 – Published 23 February 2018
• "Discrete Time-Crystalline Order in Cavity and Circuit QED Systems"
  Zongping Gong, Ryusuke Hamazaki, and Masahito Ueda
  Phys. Rev. Lett. 120, 040404 – Published 25 January 2018
  
• "Out-of-time-order fluctuation-dissipation theorem"
  Naoto Tsuji, Tomohiro Shitara, and Masahito Ueda
  Phys. Rev. E 97, 012101 – Published 3 January 2018
• "Information Retrieval and Criticality in Parity-Time-Symmetric Systems"
  Kohei Kawabata, Yuto Ashida, and Masahito Ueda
  Phys. Rev. Lett. 119, 190401 – Published 6 November 2017
  
• "Parity-time-symmetric quantum critical phenomena"
  Yuto Ashida, Shunsuke Furukawa & Masahito Ueda
  Nature Communications 8, Article number: 15791 (2017) doi:10.1038/ncomms15791
• "Zeno Hall Effect"
  Zongping Gong, Sho Higashikawa, and Masahito Ueda
  Phys. Rev. Lett. 118, 200401 – Published 18 May 2017
• "Anomalous Transport in the Superfluid Fluctuation Regime"
  Shun Uchino and Masahito Ueda
  Phys. Rev. Lett. 118, 105303 – Published 8 March 2017
  
• "Universal Work Fluctuations During Shortcuts to Adiabaticity by Counterdiabatic Driving"
  Ken Funo, Jing-Ning Zhang, Cyril Chatou, Kihwan Kim, Masahito Ueda, and Adolfo del Campo
  Phys. Rev. Lett. 118, 100602 – Published 8 March 2017
  
• "Gibbs Paradox Revisited from the Fluctuation Theorem with Absolute Irreversibility"
  Yûto Murashita and Masahito Ueda
  Phys. Rev. Lett. 118, 060601 – Published 8 February 2017
• "Exact out-of-time-ordered correlation functions for an interacting lattice fermion model"
  Naoto Tsuji, Philipp Werner, and Masahito Ueda
  Phys. Rev. A 95, 011601(R) – Published 3 January 2017
• "Emergent Electromagnetic Induction and Adiabatic Charge Pumping in Noncentrosymmetric Weyl Semimetals"
  Hiroaki Ishizuka, Tomoya Hayata, Masahito Ueda, and Naoto Nagaosa
  Phys. Rev. Lett. 117, 216601 (2016) - Published 18 November 2016
• "Fermi gases: Anisotropic universality"
  Masahito Ueda
  Nature Physics (2016) doi:10.1038/nphys3707
  
• "Work Fluctuation-Dissipation Trade-Off in Heat Engines"
  Ken Funo and Masahito Ueda
  Phys. Rev. Lett. 115, 260601 (2015)
  
• "Entanglement pre-thermalization in a one-dimensional Bose gas"
  Eriko Kaminishi, Takashi Mori, Tatsuhiko N. Ikeda and Masahito Ueda
  Nature Physics, 11, 1050-1056 (2015)
  
• "Universal High-Momentum Asymptote and Thermodynamic Relations in a Spinless Fermi Gas with a Resonant p-Wave Interaction"
  Shuhei M. Yoshida and Masahito Ueda
  Phys. Rev. Lett., 115, 135303 (2015)
  
• "Controlling and probing non-abelian emergent gauge potentials in spinor Bose-Fermi mixtures"
  Nguyen Thanh Phuc, Gen Tatara, Yuki Kawaguchi and Masahito Ueda
  Nature Communications 6, 8135 (2015)
  
• "Diffraction-Unlimited Position Measurement of Ultracold Atoms in an Optical Lattice"
  Yuto Ashida and Masahito Ueda
  Phys. Rev. Lett. 115, 095301 (2015)
  
• "Onset of a Limit Cycle and Universal Three-Body Parameter in Efimov Physics"
  Yusuke Horinouchi and Masahito Ueda
  Phys. Rev. Lett. 114, 025301 (2015)
• "Spinor Bose Gases: Symmetries, magnetism, and quantum dynamics"
  Dan M. Stamper-Kurn and Masahito Ueda
  Rev. Mod. Phys. 85, 1191 (2013)
• "Bose Gases with Nonzero Spin"
  Masahito Ueda
  Annu. Rev. Condens. Matter Phys. 3, 263 (2012)
• "Minimal Energy Cost for Thermodynamic Information Processing: Measurement and Information Erasure"
  Takahiro Sagawa and Masahito Ueda
  Phys. Rev. Lett. 102, 250602 (2009)
• "Exact Eigenstates and Magnetic Response of Spin-1 and Spin-2 Bose-Einstein Condensates"
  Masato Koashi and Masahito Ueda
  Phys. Rev. Lett. 84, 1066 (2000)
• "Macroscopic Quantum Tunneling of a Bose-Einstein Condensate with Attractive Interaction"
  Masahito Ueda and Anthony J. Leggett
  Phys. Rev. Lett. 80, 1576 (1998)
• "Logical reversibility in quantum measurement: General theory and specific examples"
  Masahito Ueda, Nobuyuki Imoto, and Hiroshi Nagaoka
  Phys. Rev. A 53, 3808 (1996)
• "Electron escape rate and barrier traversal time influenced by the electromagnetic environment"
  Masahito Ueda and Tsuneya Ando
  Phys. Rev. Lett. 72, 1726 (1994)
• "Squeezed spin state"
  Masahiro Kitagawa and Masahito Ueda
  Phys. Rev. A 47, 5138 (1993)
• "Reversibility in quantum measurement processes"
  Masahito Ueda and Masahiro Kitagawa
  Phys. Rev. Lett. 68, 3424 (1992)