See also arXiv and Google Scholar.

Preprints

Articles (peer-reviewed journal)

• M. Kohda, R. Imai, K. Kanno, K. Mitarai, W. Mizukami, Y. O. Nakagawa,
  Quantum expectation-value estimation by computational basis sampling,
  Phys. Rev. Research 4, 033173 (2022) (arXiv: 2112.07416)

• Y. Suzuki, Y. Kawase, Y. Masumura, Y. Hiraga, M. Nakadai, J. Chen, K. M. Nakanishi, K. Mitarai, R. Imai, S. Tamiya, T. Yamamoto, T. Yan, T. Kawakubo, Y. O. Nakagawa, Y. Ibe, Y. Zhang, H. Yamashita, H. Yoshimura, A. Hayashi, K. Fujii,
  Qulacs: a fast and versatile quantum circuit simulator for research purpose,
  Quantum 5, 559 (2021).
  (arXiv: 2011.13524)

• J. Takahashi, R. Imai, E. Nakano, and K. Iida,
  Bose polaron in spherical trap potentials: Spatial structure and quantum depletion,
  Phys. Rev. A 100, 023624 (2019).
  (arXiv: 1904.08799)

• R. Imai and Y. Yamanaka,
  Dynamical Properties of the Finite-size Dicke Model Coupled to a Thermal Reservoir,
  J. Phys. Soc. Jpn. 88, 024401 (2019).
  (arXiv: 1810.05888)

• R. Imai and Y. Yamanaka,
  Stability of symmetry breaking states in finite-size Dicke model with photon leakage,
  Phys. Lett. A, 382, 3333 (2018).
  (arXiv: 1801.05954)

Proceedings (peer-reviewed)

• R. Imai, J. Takahashi, T. Oyama, Y. Yamanaka,
  Semiclassical analysis of driven-dissipative excitonic condensation,
  AIP Conference Proceedings 2319, 070006 (2021).
  

Articles (others)

• 今井良輔,
  熱浴と接触する系に対する非平衡Thermo Field Dynamicsと射影演算子法,
  物性研究・電子版 Vol. 4, No. 2, 042601 (2015).