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researcher

Keisuke Fujii

Osaka University · active 2007–2026 · QCRYPT, QIP, TQC


5
program roles
51
collaborators
2007–2026
years active

Contributions

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 TQC 2007 — regular: Fault-tolerant Quantum Computation with Highly Verified Logical Cluster States QIP 2011 — poster: Fault-tolerant topological one-way quantum computation with probabilistic two-qu… QIP 2012 — poster: Error Correction Property of the Surface Codes with General Lattices QIP 2014 — poster: Measurement-free topological protection using dissipative feedback QIP 2014 — poster: Measurement-Based Quantum Computation protected by cooperative phenomena induced… QCRYPT 2015 — poster: Blind Quantum Computation against collective noise QCRYPT 2016 — poster: Practically Verifiable Blind Quantum Computation with Error Tolerance QIP 2017 — regular: Threshold theorem for quantum supremacy ▸ presenter QIP 2017 — regular: Threshold theorem for quantum supremacy ▸ presenter QIP 2017 — poster: On the Effect of Coherence of Noise in Quantum Error Correction QIP 2017 — poster: Secure quantum cloud computing with practical verification QIP 2018 — poster: Machine-learning based framework for fast and high performance decoding of the t… QIP 2019 — poster: Quantum analog-digital conversion QIP 2019 — poster: Quantum speedup in stoquastic adiabatic quantum computation QIP 2020 — poster: Constructing a virtual two-qubit gate from single-qubit operations QIP 2021 — poster: Quadratic Clifford expansion for efficient benchmarking and initialization of va… QIP 2021 — poster: Parent Hamiltonian as a benchmark problem for variational quantum eigensolvers QIP 2021 — poster: Nonlinear transformation of complex amplitudes via quantum singular value transf… QIP 2021 — poster: Quantum error mitigation for fault-tolerant quantum computing QIP 2021 — poster: Computational power of dual-unitary quantum circuits QIP 2021 — poster: Comparative study for sampling-based simulation costs of noisy quantum circuits TQC 2021 — poster: Nonlinear transformation of complex amplitudes via quantum singular value transf… QIP 2023 — regular: Optimal time-periodic Hamiltonian simulation TQC 2023 — poster: Quantifying fermionic nonlinearity of quantum circuits QIP 2024 — poster: End-to-end quantum computation for the Schwinger model QIP 2024 — poster: MNISQ: A Large-Scale Quantum Circuit Dataset for Machine Learning on/for Quantum… QIP 2024 — poster: Prospects of Multivariable Quantum Signal Processing QIP 2024 — poster: Recursive Quantum Eigenvalue/Singular-Value Transformation: Matrix Sign Function… QIP 2024 — poster: Quantum algorithms for solving linear and nonlinear differential equations TQC 2024 — poster: Probabilistic channel simulation using coherence TQC 2024 — poster: Efficient state preparation for multivariate Monte Carlo simulation QIP 2025 — regular: Explicit error bounds with commutator scaling for time-dependent product and mul… QIP 2025 — poster: Polynomial time constructive decision algorithm for multivariable quantum signal… QIP 2026 — poster: Decoder Switching: Harmonizing Speed and Accuracy in Hybrid Decoding System QIP 2026 — poster: A Quantum Algorithm for Nonlinear Electromagnetic Fluid Dynamics via Koopman-von… QIP 2026 — poster: Nontrivial multi-product commutation relation for reducing T-count in sequential… QIP 2026 — poster: On the quantum computational complexity of classical linear dynamics with geomet… QIP 2026 — poster: Clifford gates with logical transversality for self-dual CSS codes QIP 2026 — poster: Efficient quantum algorithm for linear distributed delay differential equations TQC 2018 — program · member TQC 2019 — program · member TQC 2020 — program · member QIP 2022 — program · member QIP 2026 — program · member

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4 Talks

Title Conference Type Co-authors
Explicit error bounds with commutator scaling for time-dependent product and multi-product formulas QIP 2025 regular Kaoru Mizuta, Tatsuhiko N. Ikeda
Optimal time-periodic Hamiltonian simulation QIP 2023 regular Kaoru Mizuta
Threshold theorem for quantum supremacy QIP 2017 regular ▸ presenter
Fault-tolerant Quantum Computation with Highly Verified Logical Cluster States TQC 2007 regular Katsuji Yamamoto

34 Posters

Title Conference Co-authors
Decoder Switching: Harmonizing Speed and Accuracy in Hybrid Decoding System QIP 2026 Riki Toshio, Kaito Kishi, Jun Fujisaki, Hirotaka Oshima, Shintaro Sato
A Quantum Algorithm for Nonlinear Electromagnetic Fluid Dynamics via Koopman-von Neumann Linearization QIP 2026 Yuki Ito, Hayato Higuchi, Kazuki Sakamoto, Akimasa Yoshikawa
Nontrivial multi-product commutation relation for reducing T-count in sequential Pauli-based computation QIP 2026 Yusei Mori, Hideaki Hakoshima
On the quantum computational complexity of classical linear dynamics with geometrically local interactions QIP 2026 Kazuki Sakamoto
Clifford gates with logical transversality for self-dual CSS codes QIP 2026 Theerapat Tansuwannont, Yugo Takada
Efficient quantum algorithm for linear distributed delay differential equations QIP 2026 Wataru Setoyama
Polynomial time constructive decision algorithm for multivariable quantum signal processing QIP 2025 Yuki Ito, Hitomi Mori, Kazuki Sakamoto
End-to-end quantum computation for the Schwinger model QIP 2024 Kazuki Sakamoto, Hayata Morisaki, Junichi Haruna, Etsuko Itou, Kosuke Mitarai
MNISQ: A Large-Scale Quantum Circuit Dataset for Machine Learning on/for Quantum Computers in the NISQ Era QIP 2024 Leonardo Placidi, Ryuichiro Hataya, Toshio Mori, Koki Aoyama, Hayata Morisaki, Kosuke Mitarai
Prospects of Multivariable Quantum Signal Processing QIP 2024 Hitomi Mori, Kaoru Mizuta
Recursive Quantum Eigenvalue/Singular-Value Transformation: Matrix Sign Functions by Newton Iteration QIP 2024 Kaoru Mizuta
Quantum algorithms for solving linear and nonlinear differential equations QIP 2024 Yuki Ito, Yu Tanaka
Probabilistic channel simulation using coherence TQC 2024 Benchi Zhao, Kosuke Ito
Efficient state preparation for multivariate Monte Carlo simulation TQC 2024 Hitomi Mori, Kosuke Mitarai
Quantifying fermionic nonlinearity of quantum circuits TQC 2023 Shigeo Hakkaku, Yuichiro Tashima, Kosuke Mitarai, Wataru Mizukami
Quadratic Clifford expansion for efficient benchmarking and initialization of variational quantum algorithms QIP 2021 Kosuke Mitarai, Yasunari Suzuki, Wataru Mizukami, Yuya O. Nakagawa
Parent Hamiltonian as a benchmark problem for variational quantum eigensolvers QIP 2021 Fumiyoshi Kobayashi, Kosuke Mitarai
Nonlinear transformation of complex amplitudes via quantum singular value transformation QIP 2021 Naixu Guo, Kosuke Mitarai
Quantum error mitigation for fault-tolerant quantum computing QIP 2021 Yasunari Suzuki, Suguru Endo, Yuuki Tokunaga
Computational power of dual-unitary quantum circuits QIP 2021 Ryotaro Suzuki, Kosuke Mitarai
Comparative study for sampling-based simulation costs of noisy quantum circuits QIP 2021 Shigeo Hakkaku
Nonlinear transformation of complex amplitudes via quantum singular value transformation TQC 2021 Naixu Guo, Kosuke Mitarai
Constructing a virtual two-qubit gate from single-qubit operations QIP 2020 Kosuke Mitarai
Quantum analog-digital conversion QIP 2019 Kosuke Mitarai, Masahiro Kitagawa
Quantum speedup in stoquastic adiabatic quantum computation QIP 2019
Machine-learning based framework for fast and high performance decoding of the topological stabilizer codes QIP 2018 Amarsanaa Davaasuren, Yasunari Suzuki, Masato Koashi
On the Effect of Coherence of Noise in Quantum Error Correction QIP 2017 Yasunari Suzuki, Masato Koashi
Secure quantum cloud computing with practical verification QIP 2017 Yuki Takeuchi, Tomoyuki Morimae, Nobuyuki Imoto
Practically Verifiable Blind Quantum Computation with Error Tolerance QCRYPT 2016 Yuki Takeuchi, Tomoyuki Morimae, Nobuyuki Imoto
Blind Quantum Computation against collective noise QCRYPT 2015 Yuki Takeuchi, Rikizo Ikuta, Takashi Yamamoto, Nobuyuki Imoto
Measurement-free topological protection using dissipative feedback QIP 2014 Makoto Negoro, Nobuyuki Imoto, Masahiro Kitagawa
Measurement-Based Quantum Computation protected by cooperative phenomena induced by a thermal phase transition QIP 2014 Yoshifumi Nakata, Masayuki Ohzeki, Mio Murao
Error Correction Property of the Surface Codes with General Lattices QIP 2012 Yuuki Tokunaga
Fault-tolerant topological one-way quantum computation with probabilistic two-qubit gates QIP 2011 Yuuki Tokunaga

Committee service

Conference Committee Position Title
QIP 2026 program member
QIP 2022 program member
TQC 2020 program member
TQC 2019 program member
TQC 2018 program member

Collaborators

Co-author Joint talks
Kosuke Mitarai 11
Kaoru Mizuta 4
Kazuki Sakamoto 4
Nobuyuki Imoto 4
Yasunari Suzuki 4
Hitomi Mori 3
Yuki Ito 3
Yuki Takeuchi 3
Yuuki Tokunaga 3
Hayata Morisaki 2
Masahiro Kitagawa 2
Masato Koashi 2
Naixu Guo 2
Shigeo Hakkaku 2
Tomoyuki Morimae 2
Wataru Mizukami 2
Akimasa Yoshikawa 1
Amarsanaa Davaasuren 1
Benchi Zhao 1
Etsuko Itou 1