Tomotaka Kuwahara - My portal

Profile Information

Affiliation: RIKEN Hakubi team leader, RIKEN Pioneering Research Institute (PRI) / RIKEN Center for Quantum Computing (RQC), RIKEN

Contact information: tomotaka.kuwaharariken.jp
Researcher number: 70757773
ORCID iD: https://orcid.org/0000-0002-1612-3940
J-GLOBAL ID: 202101008243519475
researchmap Member ID: R000026529

External link: https://kuwahara-quantum.com/en/

Research Interests

Quantum information, entanglement, Hamiltonian complexity, quantum many-body systems, Lieb-Robinson bound

Research Areas

Natural sciences / Mathematical physics and basic theory / Quantum information, entanglement, Hamiltonian complexity, quantum many-body systems, Lieb-Robinson bound

Research History

Apr, 2022 - Present

RIKEN Hakubi team leader, RIKEN Pioneering Research Institute (PRI) / RIKEN Center for Quantum Computing (RQC), RIKEN
Oct, 2021 - Mar, 2025

Sakigake Researcher, Japan Science and Technology Agency
Oct, 2017 - Mar, 2022

Research scientist, Center for Advanced Intelligence Project, RIKEN
Jan, 2016 - Sep, 2017

Advanced Institute for Materials Research (AIMR), Tohoku University
Apr, 2015 - Dec, 2015

JSPS Research Fellowship for Young Scientists (JSPS PD), The University of Tokyo

Major Education

Apr, 2008 - Mar, 2010

Bachelor in Applied Physics, The Faculty of Engineering, Department of Applied Physics, The University of Tokyo

Papers

Clustering of Conditional Mutual Information and Quantum Markov Structure at Arbitrary Temperatures

Tomotaka Kuwahara

Physical Review X, 15(4), Oct 16, 2025
Trotterization is Substantially Efficient for Low-Energy States

Kaoru Mizuta, Tomotaka Kuwahara

Physical Review Letters, 135(13), Sep 23, 2025
Provably Efficient Simulation of 1D Long-Range Interacting Systems at Any Temperature

Rakesh Achutha, Donghoon Kim, Yusuke Kimura, Tomotaka Kuwahara

Physical Review Letters, 134(19), May 15, 2025
Clustering Theorem in 1D Long-Range Interacting Systems at Arbitrary Temperatures

Yusuke Kimura, Tomotaka Kuwahara

Communications in Mathematical Physics, 406(3), Feb 20, 2025
Thermal Area Law in Long-Range Interacting Systems

Donghoon Kim, Tomotaka Kuwahara, Keiji Saito

Physical Review Letters, 134(2), Jan 14, 2025
Optimal light cone for macroscopic particle transport in long-range systems: A quantum speed limit approach

Tan Van Vu, Tomotaka Kuwahara, Keiji Saito

Quantum, 8 1483, Sep, 2024 Peer-reviewed
Fidelity-dissipation relations in quantum gates

Tan Van Vu, Tomotaka Kuwahara, Keiji Saito

Physical Review Research, 6(3), Aug 28, 2024
Effective light cone and digital quantum simulation of interacting bosons

Tomotaka Kuwahara, Tan Van Vu, Keiji Saito

Nature Communications, 15(1) 2520, Mar 21, 2024 Peer-reviewedLead authorCorresponding author
Exponential Clustering of Bipartite Quantum Entanglement at Arbitrary Temperatures

Tomotaka Kuwahara, Keiji Saito

Physical Review X, 12(2), Apr, 2022 Peer-reviewedLead authorCorresponding author
Fate of Measurement-Induced Phase Transition in Long-Range Interactions

Takaaki Minato, Koudai Sugimoto, Tomotaka Kuwahara, Keiji Saito

Physical Review Letters, 128(1), Jan 5, 2022
Lieb-Robinson Bound and Almost-Linear Light Cone in Interacting Boson Systems

Tomotaka Kuwahara, Keiji Saito

Physical Review Letters, 127(7), Aug 13, 2021
Sample-efficient learning of interacting quantum systems

Anurag Anshu, Srinivasan Arunachalam, Tomotaka Kuwahara, Mehdi Soleimanifar

Nature Physics, 17(8) 931-935, Aug, 2021
Improved Thermal Area Law and Quasilinear Time Algorithm for Quantum Gibbs States

Tomotaka Kuwahara, Álvaro M. Alhambra, Anurag Anshu

Physical Review X, 11(1), Mar 9, 2021
Many-body scar state intrinsic to periodically driven system

Sho Sugiura, Tomotaka Kuwahara, Keiji Saito

Physical Review Research, 3(1), Feb 2, 2021
Absence of Fast Scrambling in Thermodynamically Stable Long-Range Interacting Systems

Tomotaka Kuwahara, Keiji Saito

Physical Review Letters, 126(3), Jan 22, 2021
Area law of noncritical ground states in 1D long-range interacting systems

Tomotaka Kuwahara, Keiji Saito

Nature Communications, 11(1), Dec, 2020
Sample-efficient learning of quantum many-body systems

Anurag Anshu, Srinivasan Arunachalam, Tomotaka Kuwahara, Mehdi Soleimanifar

Proceedings - Annual IEEE Symposium on Foundations of Computer Science, FOCS, 2020- 685-691, Nov 1, 2020
Gaussian concentration bound and Ensemble equivalence in generic quantum many-body systems including long-range interactions

Tomotaka Kuwahara, Keiji Saito

Annals of Physics, 421 168278-168278, Oct, 2020
Strictly Linear Light Cones in Long-Range Interacting Systems of Arbitrary Dimensions

Tomotaka Kuwahara, Keiji Saito

Physical Review X, 10(3), Jul 13, 2020
Clustering of Conditional Mutual Information for Quantum Gibbs States above a Threshold Temperature

Tomotaka Kuwahara, Kohtaro Kato, Fernando G. S. L. Brandão

Physical Review Letters, 124(22), Jun 1, 2020

Misc.

8pAZ-3 Stability to an external perturbation implies no quantum macroscopicity

Kuwahara Tomotaka, Arad Itai, Amico Luigi, Vedral Vlatko

Meeting abstracts of the Physical Society of Japan, 69(2) 75-75, Aug 22, 2014
Complementary inequality between the Fisher information and the energy gap

Kuwahara Tomotaka

Meeting abstracts of the Physical Society of Japan, 68(2) 222-222, Aug 26, 2013
27pXX-10 General upper bound of energy gap in terms of fluctuation of additive operators

Kuwahara Tomotaka

Meeting abstracts of the Physical Society of Japan, 68(1) 365-365, Mar 26, 2013
18aAK-10 General conditions for the generation of the long-distance entanglement

Kuwahara Tomotaka

Meeting abstracts of the Physical Society of Japan, 67(2) 124-124, Aug 24, 2012
21pED-1 Maximization of the thermal entanglement of indirectly interacting two qubits

Kuwahara Tomotaka, Hatano Naomichi

Meeting abstracts of the Physical Society of Japan, 66(2) 134-134, Aug 24, 2011
25aRB-9 Maximization of thermal entanglement of arbitrarily interacting two qubits

Kuwahara Tomotaka, Hatano Naomichi

Meeting abstracts of the Physical Society of Japan, 66(1) 168-168, Mar 3, 2011

Presentations

40

Quantum complexity and generalized area law in fully connected models

Donghoon Kim, Tomotaka Kuwahara

28th Annual Conference on Quantum Information Processing (QIP 2025), Feb 28, 2025
28

Advanced Tutorial on the bosonic Lieb-Robinson bound

Tomotaka Kuwahara

New Directions in Correlated Quantum Systems, Feb 17, 2025 Invited
88

Clustering of conditional mutual information and quantum Markov structure at arbitrary temperatures

Tomotaka Kuwahara

27th Annual Conference on Quantum Information Processing (QIP 2024), Jan 18, 2024
169

Unifying speed limit and Lieb-Robinson bound: Wisdom from optimal transport

Vu Van Tan, Tomotaka Kuwahara, Keiji Saito

27th Annual Conference on Quantum Information Processing (QIP 2024), Jan 17, 2024
191

Optimal light cone and digital quantum simulation of interacting bosons

Tomotaka Kuwahara, Tan Van Vu, Keiji Saito

26th Conference on Quantum Information Processing (QIP2023), Feb 6, 2023
193

Exponential clustering of bipartite quantum entanglement at arbitrary temperatures

Tomotaka Kuwahara, Keiji Saito

25th Annual Conference on Quantum Information Processing (QIP2022), Mar 11, 2022
129

Lieb-Robinson bound and almost linear light cone in interacting boson systems

Tomotaka Kuwahara, Keiji Saito

16th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC2021), Jul 6, 2021
95

Sample efficient learning of interacting quantum systems

Anurag Anshu, Srinivasan Arunachalam, Tomotaka Kuwahara, Mehdi Soreimanifar

24th Annual Conference on Quantum Information Processing (QIP2021), Feb 3, 2021
159

Improved thermal area law and quasi-linear time algorithm for quantum Gibbs states

Tomotaka Kuwahara, Alvaro Alhambra, Anurag Anshu

24th Annual Conference on Quantum Information Processing (QIP2021), Feb 2, 2021
188

Sample efficient learning of interacting quantum systems

Anurag Anshu, Srinivasan Arunachalam, Tomotaka Kuwahara, Mehdi Soreimanifar

The 61st Annual Symposium on Foundations of Computer Science (FOCS2020), Nov 18, 2020
155

Strictly Linear Light Cones in Long-Range Interacting Systems of Arbitrary Dimensions

Tomotaka Kuwahara, Keiji Saito

15th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC2020), Jun 10, 2020
89

Area law and clustering of information in non-critical long-range interacting systems

Tomotaka Kuwahara, Kohtaro Kato, Keiji Saito, Fernando Brandao

23rd Annual Conference on Quantum Information Processing (QIP2020), Jan 7, 2020
198

量子多体系における情報量の普遍的限界

桑原知剛

京都大学基礎物理学研究所集中講義

Research Projects

Foundations of Secure Distributed Quantum Computing on Medium-Scale Quantum Computers

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (S), Japan Society for the Promotion of Science, Apr, 2024 - Mar, 2029
速度限界と情報伝播に関する理論的研究

科学研究費助成事業, 基盤研究(B), 日本学術振興会, Apr, 2023 - Mar, 2027

齊藤圭司, 桑原知剛
Exponential speedup in quantum computing based on quantum many-body theory

Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), Oct, 2021 - Mar, 2025
Computational complexity of quantum many-body problem in terms of Tensor Network formalism

Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists, Grant-in-Aid for Early-Career Scientists, Japan Society for the Promotion of Science, Apr, 2018 - Mar, 2022

Kuwahara Tomotaka
量子多体系基底状態の複雑性の解析－－－量子情報論的視点－－－

科学研究費助成事業特別研究員奨励費, 特別研究員奨励費, 日本学術振興会, Apr, 2014 - Mar, 2016

桑原知剛