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Photos by Sugumi Kanno @ Einstein Museum
Our research group explores cosmology and gravitational theory using quantum information theory. We are theoretically investigating fundamental questions such as “How did the universe begin and evolve?” and “Is it possible to unify gravity and quantum theory?”
In cosmology, we focus on primordial gravitational waves generated in the early universe and the nature of dark matter. In gravitational theory, we address foundational problems concerning the consistency between gravity and quantum field theory. (Click here for more details on our research.)
Our group consists of 5 faculty members, 6 doctoral students, 4 master's students, and 5 undergraduate students. (Click here for more details about members.)
Recent News
Apr 20, 2026
Apr 20, 2026
The research result was press-released.
Press release: Bringing quantum time into the lab—a single clock can run young and old at once
Apr 20, 2026
Apr 20, 2026
The paper was published in Physical Review Letters and selected as an Editors' Suggestion.
Gabriel Sorci, Joshua Foo, Dietrich Leibfried, Christian Sanner, Igor Pikovski
"Quantum Signatures of Proper Time in Optical Ion Clocks"
Apr 15, 2026
Yuta Uenaga talked as an invited speaker in Workshop on Quantum Geometry and Related Topics held at Osaka Metropolitan University.
Apr 15, 2026
The research result was press-released by Kyushu University.
Mar 31, 2026
Mar 31, 2026
Our paper appears on arXiv.
Tomoya Hirotani, Akira Matsumura
"Testing classical-quantum gravity with geodesic deviation''
Mar 27, 2026
Mar 27, 2026
Our paper appears on arXiv.
Giuseppe Fabiano, Tomohiro Fujita, Akira Matsumura, Daniel Carney
"Minimal noise in non-quantized gravity''
Mar 25, 2026
Mar 25, 2026
Yuta Uenaga was awarded for his outstanding master’s thesis, following a highly favorable evaluation by the review committee.
Mar 25, 2026
Masaki Tani, Yuta Uenaga, Kosei Hatakeyama, Tomoya Hirotani and Ryotaro Fukuzumi have obtained their Master’s degrees in Science. Shogo Higuma, Kota Fujii and Takeaki Murata have obtained their bachelor’s degrees in Science.
Masaki Tani will get a job at a company, and Yuta Uenaga, Kosei Hatakeyama, Tomoya Hirotani and Ryotaro Fukuzumi will continue their research in our laboratory as doctoral students. Shogo Higuma, Kota Fujii and Takeaki Murata will also continue their research as master students.
The image is from HP of The Physical Society of Japan 2026 Annual Meeting.
Mar 23 - 26, 2026
Yuta Uenaga and Taiki Ikeda made oral presentations in The Physical Society of Japan 2026 Annual Meeting held online.
Mar 17, 2026
Mar 17, 2026
Our paper appears on arXiv.
Kosei Hatakeyama, Ryotaro Fukuzumi, Akira Matsumura, Daisuke Miki, Kazuhiro Yamamoto
"Measurement-Based Estimation of Causal Conditional Variances and Its Application to Macroscopic quantum phenomenon''
The image is from HP of Concepts of Quantum and Spacetime.
Mar 9 - 12, 2026
Akira Matsumura talked as an invited speaker and Tomoya Hirotani made a poster presentation in Concepts of Quantum and Spacetime held at KEK.
The image is from HP of Quantum Foundations.
Mar 5 - 6, 2026
Takano Taira, Yuta Uenaga, Tomoya Hirotani made poster presentations in Quantum Foundations held at Osaka University.
Feb 13, 2026
The research result was press-released by Kyushu University.
Press release: The quantum nature hidden in gravitational waves from binary black holes ーA first step towards quantum gravity theoryー
Feb 12, 2026
Feb 12, 2026
The paper was published in Physical Review Letters.
Sugumi Kanno, Jiro Soda, Akira Taniguchi
"Coherent State Description of Gravitational Waves from Binary Black Holes"
Feb 2, 2026
Feb 2, 2026
Our paper appears on arXiv.
Kaito Kashiwagi, Akira Matsumura
"Gravitational effects on a dissipative two-level atom in the weak-field regime''
Jan 28, 2026
Jan 28, 2026
Our paper appears on arXiv.
Kimihiro Nomura, Akira Taniguchi, Kazushige Ueda
"Violation of the Leggett-Garg inequality in photon-graviton conversion''
Jan 23, 2026
Akira Taniguchi received Outstanding Presentation Award Gold Prize at The 34th Workshop on General Relativity and Gravitation in Japan (JGRG 34).
Tiltle: Quantum nature of gravitational waves from binary black holes and its applications to cosmology
The photo is from HP of JGRG 34.
Jan 19 - 23, 2026
Akira Matsumura, Kaito Kashiwagi, Akira Taniguchi, Yuta Uenaga, Kosei Hatakeyama, Ryotaro Fukuzumi, Tomoya Hirotani and Taiki Ikeda gave oral presentations at The 34th Workshop on General Relativity and Gravitation in Japan (JGRG 34) held at Kyoto University.
Jan 15, 2026
Jan 15, 2026
Our research was featured in the Quantum and Spacetime Research Institute.
Article：Squeezed Light Enhances the Sensitivity of Experiments Probing Gravity-Induced Entanglement
Contact us
Contact us
Department of Physics, Kyushu University
W1-A-720, 744, Motooka, Nishi-ku, Fukuoka, Japan, 819-0395
Phone: +81-092-802-4101
Fax: +81-092-802-4107
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