Welcome to UTokyo Komaba quantum information theory group site!
We work on foundational aspects of quantum information theory, aiming to understand operational significance of quantum properties using the tools in physics, information theory, and computer sciences. We are generally interested in wide range of topics in quantum information, but we have been paricularly focusing on
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Quantum resource theories
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Quantum entanglement theory
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Quantum thermodynamics
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Continuous-variable qunatum information
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Quantum error correction and mitigation
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Quantum algorithms
If you are interested in discussing with us or knowing more about the group, feel free to shoot an email to ryujitakagi.pat[at]gmail.com
news
| 2025 May | Our work that introduced a quantum extenstion of dynamic programming has been published in Physical Review Letters. Joint work with Jeongrak Son, Marek Gluza, and Nelly Ng at Nanyang Technological University Singapore. |
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| 2025 May | Work by Yosuke (who was with us until this March) on random unitaries has been published in Physical Review Letters and Physical Review A. |
| 2025 Apr | Our work on quantum thermodynamics has been published in Physical Review Letters. We showed that “Gibbs-preserving operations”—one of the standard operations frequently used in anslysis—may incur infinite costs to implement, prompting us to reconsider the physical justification of their use. Joint work with Hiroyasu Tajima at Kyushu University. |
| 2025 Apr | Posted a preprint (by Kaito and Ryuji) on quantum thermodynamics. We introduced a “universal work extractor”, which is designed independently of the input state but still extracts the optimal work from every input state given in the iid form. |
| 2025 Apr | Hayato, two Koki’s, Rio, and Shinnosuke have joined the group. Welcome! Yosuke has moved to RIKEN. Best of luck with the new position! |