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Quantum Information Lab
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A theory lab that explores the relationship between “information and physics” through quantum information and nonequilibrium physics.
AboutAbout the lab
Exploring the relationship between “information and physics” through quantum theory.
The Quantum Information Lab studies the relationship between “information and physics” by combining quantum information theory with nonequilibrium thermodynamics and statistical mechanics.
The lab is particularly interested in the fundamental limits of physical processes such as thermodynamics, measurement, and computation, and in how quantum effects affect those limits.
It uses mathematical methods to investigate what restrictions and effects symmetry brings to measurement, quantum computation, and heat engines.
On the lab's website, it is introduced under the name “Tajima Lab.”
Key terms
- Wigner-Araki-Yanase (WAY) theorem
- A theorem stating that, under a conservation law, an observable that does not commute with the conserved quantity cannot be measured without error
- Resource theory of asymmetry
- A theory that quantifies how much a change in a quantum system breaks symmetry. It is used to analyze operations that preserve symmetry
- Quantum error mitigation
- A technique for reducing the effects of noise on noisy quantum devices
NewsLab news
A paper by Associate Professor Tajima and colleagues was published in Physical Review X
Associate Professor Tajima received the Young Scientists' Award in the FY2026 Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology
Research results by a Project Assistant Professor were published in Physical Review Letters (Editors' Suggestion)
ResearchResearch themes
The lab's research theme is to investigate the relationship between “information and physics.” By combining mathematical methods from quantum information theory and nonequilibrium thermodynamics and statistical mechanics, the lab explores the fundamental limits of thermodynamic, measurement, and computational processes, and how quantum effects affect them.
*Illustrative imageRestrictions that symmetry imposes on information processing
Starting from the Wigner-Araki-Yanase (WAY) theorem, the lab studies the restrictions that symmetries such as conservation laws impose on the accuracy of measurements and quantum computation operations. It has also shown a trade-off relation among symmetry, irreversibility, and quantumness (the SIQ theorem).
*Illustrative imageResource theory of symmetry breaking
The lab is developing the foundations of the resource theory of asymmetry, which measures how much symmetry breaking a system has from the viewpoint of quantum information. It has established a theory of state transformations under U(1) symmetry and a theory of transformations under general compact Lie groups.
*Illustrative imageQuantum advantage in heat engines
The lab analyzes what limits and possibilities quantum effects bring to the performance of heat engines. It has shown that using quantum coherence makes it possible to keep the output power large while keeping the efficiency close to the Carnot limit.
*Illustrative imageLimits on the sampling cost of error mitigation
The lab has studied the fundamental lower bound on the sampling cost of quantum error mitigation on noisy quantum devices. Applying the mathematical structure of the SIQ theorem, it has derived a lower bound that no error mitigation method can avoid.
MembersFaculty
The members of the Quantum Information Lab consist of faculty members, a Project Associate Professor, a Visiting Assistant Professor, technical staff, and doctoral, master's, and undergraduate students.As of 2026
- Associate ProfessorHiroyasu Tajima
- Project Associate ProfessorYui Kuramochi
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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: “Heat engine summary” Brundl15 / CC BY-SA 4.0 (cropped)
- Restrictions that symmetry imposes on information processing: “Worm's-eye view of Tokyo Skytree with vertical symmetry impression, a sunny day, in Japan” Basile Morin / CC BY-SA 4.0 (cropped)
- Resource theory of symmetry breaking: “Lab Mol Colloidal quantum dots 01” Lab mol (Ilia Litvinov) / CC BY 4.0 (cropped)
- Quantum advantage in heat engines: “Heat engine” Gonfer / CC BY-SA 3.0 (cropped)
- Limits on the sampling cost of error mitigation: “Quantum-computer-Chalmers 2017” Anita Fors (Chalmers) / CC BY-SA 4.0 (cropped)
- Related lab (Mathematical Engineering and Information Circuits Lab): “Communication theory” JuanOF9 / CC BY-SA 4.0 (cropped)
- Related lab (Stringology Lab): “A diagram of the Aho-Corasick string search algorithm extracted” User:Algorithmist / CC0 (cropped)
- Related lab (Algorithm Theory Lab): “Jungheinrich Autonomous Robot arculee M” Marc Auledas Noguera (Auledas) / CC BY 4.0 (cropped)
- Related lab (Information Security & Multimedia Security Lab): “Homomorphic Encryption Setup” Aaadir / CC0 (cropped)
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