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RIKEN Center for Quantum Computing Quantum Computational Science Research Team

Team Leader: Seiji Yunoki (D.Eng.)

Research Summary

Seiji Yunoki (D.Eng.)

Our main interest is to propose quantum-classical hybrid algorithms for simulating quantum many-body systems. We also analyze quantum dynamics of quantum computing based on quantum information. For these purposes, we develop quantum simulations for quantum computing using classical computers. We are also interested in quantum-classical hybrid systems for future high performance computing.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Informatics
  • Interdisciplinary Science & Engineering
  • Computational science
  • Mathematical physics/Condensed matter physics
  • High performance computing


  • Quantum many-body systems
  • Quantum dynamics
  • Quantum information physics
  • Tensor network
  • Quantum entanglement

Selected Publications

  • 1. Seki, K. and Yunoki, S.:
    "Quantum power method by a superposition of time-evolved states"
    PRX Quantum 2, 010333 (2021).
  • 2. Shirakawa, T., Seki, K., and Yunoki, S.
    "Discretized quantum adiabatic process for free fermions and comparison with the imaginary-time evolution"
    Phys. Rev. Research 3, 013004 (2021).
  • 3. Seki, K. and Yunoki, S.:
    Emergence of a thermal equilibrium in a subsystem of a pure ground state by quantum entanglement"
    Phys. Rev. Research 2, 043087 (2020).
  • 4. Ueda, H., Okunishi, K., Yunoki, S., and Nishino, T.:
    "Corner transfer matrix renormalization group analysis of the two-dimensional dodecahedron model"
    Phys. Rev. E 102, 032130 (2020).
  • 5. Ueda, H., Okunishi, K., Harada, K., Krcmar, R., Gendiar, A., Yunoki, S., and Nishino, T.
    "Finite-m scaling analysis of Berezinskii-Kosterlitz-Thouless phase transitions and entanglement spectrum for the six-state clock model"
    Phys. Rev. E 101, 062111 (2020).
  • 6. Seki, K., Shirakawa, T., and Yunoki, S.:
    "Symmetry-adapted variational quantum eigensolver"
    Phys. Rev. A 101, 052340 (2020).
  • 7. Shinjo, K., Sota, S., Yunoki, S., and Tohyama, T.:
    "Characterization of photoexcited states in the half-filled one-dimensional extended Hubbard model assisted by machine learning"
    Phys. Rev. B 101, 195136 (2020).

Lab Members

Principal investigator

Seiji Yunoki
Team Leader

Contact Information

2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: yunoki [at] riken.jp