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Quantum Cosmophysics Theory Lab
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A lab that uses quantum information theory to tackle the mysteries of the universe and gravity.
AboutAbout the lab
Exploring the beginning of the universe and the quantum nature of gravity.
The Quantum Cosmophysics Theory Lab uses quantum information theory to study cosmology and theories of gravity.
The lab tackles questions such as "How did the universe begin and evolve?" and "Can gravity and quantum theory be unified?"
In cosmology, it studies primordial gravitational waves and dark matter generated at the beginning of the universe, and in gravitational theory, it examines the consistency between gravity and quantum field theory.
Key terms
- Primordial gravitational waves
- Gravitational waves predicted by the standard scenario of the universe, which have not yet been detected.
- Quantum entanglement
- A quantum correlation between objects that can be generated only through quantum interactions.
- Open quantum system
- A quantum system that interacts with its surrounding environment. A completely isolated quantum system does not exist in reality.
NewsLab news
A master's student won second place in the Oral Award at the Summer School for Young Researchers in Astronomy and Astrophysics
Construction of a framework for clarifying the properties of quantum gravity announced in a Kyushu University press release
Research on atomic clocks and the superposition of "time" announced in a Kyushu University press release
A new method for creating quantum superpositions of macroscopic mirrors announced in a Kyushu University press release
Research on quantum features hidden in gravitational waves from binary black holes announced in a Kyushu University press release
ResearchResearch themes
The lab uses quantum information theory and quantum technologies to theoretically investigate the beginning of the universe and the quantum nature of gravity. Its research is divided into cosmology, the quantum nature of gravity, and open quantum systems.
*Illustrative imageAccelerated expansion of the universe and primordial gravitational waves
The lab approaches from theory the origin of the accelerated expansion of the universe, the nature of dark matter, and the question of whether the structure of the universe arose from quantum fluctuations of spacetime during inflation. It also proposes a new detection theory that applies the quantum decoherence caused by primordial gravitational waves.
*Illustrative imageTesting the quantum nature of gravity
Based on the proposal that if gravity behaves quantum mechanically, entanglement should arise between massive objects, the lab studies the relationship between gravity-induced entanglement and the quantum theory of the gravitational field. Using the theory of optomechanical systems, in which macroscopic mirrors are precisely controlled with laser light, it analyzes the detection of gravity-induced entanglement.
*Illustrative imageOpen quantum system theory and quantum gravity
Real quantum systems always interact with their surrounding environment, and open quantum system theory describes their behavior. The lab studies the framework of relativistic open quantum system theory, aiming to elucidate quantum gravity.
MembersFaculty
The members of the Quantum Cosmophysics Theory Lab consist of faculty, postdoctoral researchers, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorKazuhiro Yamamoto
- Associate ProfessorSugumi Kanno
- Associate ProfessorJoshua Foo
- Assistant ProfessorAkira Matsumura
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Universum” Heikenwaelder Hugo, Austria, , www.heikenwaelder.at / CC BY-SA 2.5 (cropped)
- Accelerated expansion of the universe and primordial gravitational waves: “Lambda-Cold Dark Matter, Accelerated Expansion of the Universe, Big Bang-Inflation” User:Coldcreation / CC BY-SA 3.0 (cropped)
- Testing the quantum nature of gravity: “Black Hole Outflows From Centaurus A” ESO/WFI (Optical); MPIfR/ESO/APEX/A.Weiss et al. (Submillimetre); NASA/CXC/CfA/R.Kraft et al. (X-ray) Derivative work including grading and crop: Julian Herzog / CC BY 4.0 (cropped)
- Open quantum system theory and quantum gravity: “IBM Quantum System One” OJB Quantum / CC BY 4.0 (cropped)
- Related lab (Particle Physics Theory Lab): “Elementary Particle Interactions” ParticlesAndMath / CC BY-SA 4.0 (cropped)
- Related lab (Theoretical Physics of Particle Systems Lab): “Cosmic Microwave Background (CMB)” ESA and the Planck Collaboration / CC BY 4.0 (cropped)
- Related lab (Mathematical Physics Lab): “Simulation of a cosmological thermal phase transition, late times” DWeir / CC BY 4.0 (cropped)
- Related lab (Theoretical Nuclear Physics Lab): “The Crab Nebula (weic2326a)” NASA, ESA, CSA, STScI, T. Temim (Princeton University) / CC BY 4.0 (cropped)
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