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RIKEN Center for Quantum Computing Quantum Computing Theory Research Team

Team Leader: Keisuke Fujii (Ph.D. (Eng.))

Research Summary

Keisuke Fujii (Ph.D. (Eng.))

We focus on quantum software engineering science, which is necessary for the realization of quantum computers. We will develop basic technologies to exploit the performance of quantum computers on a scale that is now being realized or will be realized in the next few years, as well as applications of them to fundamental physics, quantum chemistry, and quantum machine learning, and we will work on quantum computer architectures, quantum error correction, and optimization of quantum circuits to realize large scale fault-tolerant quantum computers. We are also interested in interdisciplinary fields between quantum information science and fundamental physics, quantum chemistry, machine learning, and high-performance computing.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Informatics
  • Atomic/Molecular/Quantum electronics
  • Theory of informatics
  • Mathematical physics/ Fundamental condensed matter physics

Keywords

  • Quantum computing
  • Quantum information science
  • Quantum machine learning
  • Quantum many-body system

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.

  • 1. Tatsuhiko N. Ikeda, Hideki Kono, Keisuke Fujii.:
    "Measuring Trotter error and its application to precision-guaranteed Hamiltonian simulations"
    Physical Review Research 6(3) 033285-1-033285-14 (2024)
  • 2. Y Akahoshi, K Maruyama, H Oshima, S Sato, K Fujii.:
    "Partially Fault-tolerant Quantum Computing Architecture with Error-corrected Clifford Gates and Space-time Efficient Analog Rotations"
    PRX Quantum 5(1) 010337:1-010337:21 (2024)
  • 3. Kaoru Mizuta, Yuya O. Nakagawa, Kosuke Mitarai, Keisuke Fujii.:
    "Local variational quantum compilation of a large-scale Hamiltonian dynamics"  
    PRX Quantum 3(4) 040302:1-040302:24 (2022)
  • 4. *K. Mitarai, M. Negoro, M. Kitagawa, and K. Fujii.:
    "Quantum Circuit Learning"
    Phys. Rev. A, 98, 032309 (2018)
  • 5. *K. Fujii and K. Nakajima.:
    "Harnessing Disordered-Ensemble Quantum Dynamics for Machine Learning"
    Phys. Rev. Applied, 8, 24030 (2017)

Recent Research Results

Lab Members

Principal investigator

Keisuke Fujii
Team Leader

Core members

Tatsuhiko Ikeda
Research Scientist
Yasushi Yoneta
Special Postdoctoral Researcher
takaya Matsuura
Postdoctoral Researcher
Kaoru Mizuta
Visiting Scientist

Contact Information

Bioscience Building(S01)
2-1 Hirosawa,
Wako-shi, Saitama
351-0198
Email: keisuke.fujii.ay@riken.jp

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