Quantum Information Group
Information is physical: Although information is abstract, it is always processed by physical systems and constrained by the laws of physics. Quantum information science explores the possibilities and limits of information processing based on these fundamental physical laws, described by quantum theory.
The goal of our group is:
Uncover the fundamental role of information in quantum theory, and connect these insights to new information technologies.
Our research spans quantum information processing, such as quantum communication, quantum error correction, and quantum algorithms, as well as foundational studies that seek fundamental physics from an information-theoretic perspective.
Through an interdisciplinary approach bridging computer science and physics, we explore the potential of quantum information and pursue advances that contribute to the future of science.
News
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February 6, 2026The website is updated. I am going to move to a new position in Japan from April. Please contact me if you are interested in joining my new group.
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February 19, 2025I will give a talk in The 6th RIKEN AIP Mathematics Joint Seminar. The slides are here.
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January 10, 2025Our paper about new constructions of a decoderhas been published from npj Quantum Information.
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January 1, 2025Happy new year.
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November 28, 2024Updates for recent results.
Our paper `Low-depth random Clifford circuits for quantum coding against Pauli noise using a tensor-network decoder' is published from Physical Review Research.
Our paper `Hayden-Preskill Recovery in Hamiltonian Systems' is published from Physical Review Research (Letter).
New papers on the arXiv: `On computational complexity of unitary and state design properties' and `Explicit decoders using fixed-point amplitude amplification based on QSVT'. -
April 22, 2024Updated the results in 2023.
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March 30, 2023Updates for recent results.
`Black holes as clouded mirrors: the Hayden-Preskill toy model with symmetry' in Quantum.
`One-Shot Triple-Resource Trade-Off in Quantum Channel Coding' in IEEE Trans. Inf..
`Hayden-Preskill Recovery in Hamiltonian Systems' and `Low-depth random Clifford circuits for quantum coding against Pauli noise using a tensor-network decoder' on the arXiv. -
August 1, 2022I start working at Yukawa Institute for Theoretical Physics, Kyoto University as a research associate professor.
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June 8, 2022Our paper was published from Advances in Mathematics. My first math paper! (though my contribution is little)
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May 30, 2022Our new paper is now available on arXiv. Great collaboration with members in Owari group at Shizuoka University.
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May 30, 2022Our paper was published from Quantum.
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May 10, 2022I am invited to give a talk about unitary designs in QIT46.
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May 10, 2022Our paper was accepted in Quantum.
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April 24, 2022A new academic year has started.
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December 17, 2021I give a talk at IFQ-ExU workshop about a decoder of the Hayden-Preskill protocol.
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December 16, 2021I gave a talk at ISNTT2021 about randomized benchmarking. Happy that people were interested a lot!
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November 10, 2021Accepted as an oral talk at ISNTT2021.
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November 8, 2021We organize an international workshop Quantum Information Entropy in Physics in March 2022. If you are interested, please join us.
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November 5, 2021A website of Extreme Universe is now available.
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September 10, 2021Extreme Universe (Head Investigator: Tadashi Takayanagi, Grant-in-Aid for Transformative Research Areas(A) 2021) was accepted. It is great to be a member of such a big project.
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September 6, 2021I am invited to give a lecture on Workshop on quantum information and quantum black holes. I will talk about something about quantum information and black holes (perhaps conventional ones).
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September 4, 2021Our paper has been published from PRX Quantum.
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August 16, 2021Our result was acepted as a long talk in AQIS2021.
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August 14, 2021Our paper was acepted in PRX Quantum.
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August 5, 2021I will give a lecture on the black hole information paradox in the summer school of high energy physics, which starts tommorow.
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July 16, 2021Our paper was published from Communications in Mathematical Physics.
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July 8, 2021Our paper was published from Physics Review A.
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July 8, 2021I gave a talk at TQC2021. The video is available on youtube.
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June 23, 2021Our paper was accepted in Physical Review A.
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June 4, 2021Our paper was acepted in Communications in Mathematical Physics.
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March 27, 2021I gave a lecture at the Spring School of Quantum Information 2021.
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March 15, 2021I gave a talk at JPS spring meeting 2021.
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March 4, 2021I gave a talk about our recent result in Recent progress in theoretical physics based on quantum information theory at YITP. The slides and video are available at this page.
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February 25, 2021We have uploaded our new paper Quantum circuits for exact unitary t-designs and applications to higher-order randomized benchmarkingon the arXiv. It's a huge collaboration with mathematicians, theoretical physicists, and experimentalists.
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January 13, 2021Our paper New holographic generalization of entanglement entropy was published from Phys. Rev. D. I would like to thank the members in Takayanagi group in YITP for the great collaboration.
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January 1, 2021Happy new year!
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November 3, 2020Our new paper "One-shot quantum error correction of classical and quantum information is now on arXiv. We argue that channel codings is possible by using NISQ evices.
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September 23, 2020Our new paper "Explicit construction of exact unitary designs is now available on arXiv. What a great work!
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September 14, 2020I gave a talk about the workshop about thermodynamics in quantum many-body systems. It is about "scrambling and information recovery from a subsystem".
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July 29, 2020I gave a talk about "Information Leakage From Quantum Black Holes With Symmetry" in Qulink Seminar.
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July 2, 2020Our new paper "Information Leakage From Quantum Black Holes With Symmetry" is now available on the arXiv. It's a great work. Check it out.
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June 23, 2020Our new paper "One-Shot Trade-Off Bounds for State Redistribution of Classical-Quantum Sources" is now available on the arXiv. It's about one-shot hybrid state redistribution, from which numerous protocols are obtained.
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June 19, 2020My old paper "Generic Entanglement Entropy for Quantum States with Symmetry" was published in Entropy (Special Issue "Quantum Probability, Statistics and Control").
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May 28, 2020A new paper "Holographic Pseudo Entropy" is now on the arXiv. Thanks to the wonderful members in Takayanagi group in YITP.
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May 16, 2020I have moved to Koashi group in Photon Science Center of the University of Tokyo as an assistant professor.
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April 28, 2020Our new paper "Randomized Partial Decoupling Unifies One-Shot Quantum Channel Capacities" is now on the arXiv. We have shown the unified channel coding theorem for classical-quantum hybrid communication in the one-shot scenario.
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February 6, 2020I will move to Koashi group in the University of Tokyo from 5 May 2020. My new position is assistant professor.
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February 4, 2020I will give a talk about Classical-Quantum Hybrid Channel Coding in FQST2020.
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January 11, 2020I will give a poster presentation in the 9th QUATUO workshop. It is about the black hole information paradox.
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January 7, 2020I am happy to announce a Quantum Information Spring School 2020 at Osaka University (8-11 March).
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January 5, 2020I will give a talk about Classical-Quantum Hybrid Capacity in 2020 International Workshop on Quantum Information, Computing, and Control.
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January 1, 2020Happy New Year. I will update my website more frequently this year.
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December 31, 2019Our result about the classical-quantum hybrid channel coding was chosen as a contributed talk in FQST2020.
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May 17, 2019I become a program member of the 3rd JAGFoS (Japanese-American-German Frontiers of Science Symposium).
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May 11, 2019I become a program committee of AQIS2019.
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24. April 2019I will give a talk at the 2nd JAGFoS ((Japanese-American-German Frontiers of Science Symposium)) about entanglement.
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April 1, 2019Our new result about new decoupling theorems with E. Wakakuwa was accepted as a talk in ISIT2019.
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March 15, 2019A new paper "One-Shot Randomized and Nonrandomized Partial Decoupling" with E. Wakakuwa is now available on the arXiv.
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February 15, 2019I will give a lecture in Winter School of quantum information at YITP （18.03～20.03）. I plan to talk about the basics of quantum randomness.
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February 15, 2019I will go to JSP Annual (74th) Meeting （14.03～17.03）. I am going to talk about the black hole information paradox when it has symmetry.
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January 14, 2019The poster presentation in QIP2019 was done. I needed to explain to so many people.
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January 4, 2019I will give a poster presentation in QIP2019. It is about the information paradox of quantum black holes with symmetry.
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January 4, 2019My website has been opened.
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January 1, 2019I start working at Yukawa Institute for Theoretical Physics, Kyoto University.