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Quantum Information Lab
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A lab that explores the relationship between “information and physics” through quantum information theory and nonequilibrium thermodynamics and statistical mechanics.
AboutAbout the lab
Exploring information and physics from a quantum perspective
The Quantum Information Lab investigates the relationship between “information and physics” by combining the mathematical methods of quantum information theory and nonequilibrium thermodynamics and statistical mechanics.
Its particular interest lies in the fundamental limits of physical processes such as thermodynamic, measurement, and computational processes, and in how quantum effects influence those limits.
It also looks ahead to applications to practically important problems, such as improving the performance of heat engines by using quantum effects.
On the lab's website, it is introduced under the name “Tajima Lab.”
Key terms
- Resource theory of asymmetry
- A theory that quantifies how much the dynamics of a quantum system break symmetry
- Wigner-Araki-Yanase theorem
- A theorem showing that, under a conservation law, an observable that does not commute with the conserved quantity cannot be measured without error
- Quantum error mitigation
- Techniques for suppressing the effects of noise on noisy quantum devices
NewsLab news
Paper by Associate Professor Tajima and colleagues published in Physical Review X, with a press release
Associate Professor Tajima receives the FY2026 Young Scientists' Award, Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology
Research by a Project Assistant Professor published in Physical Review Letters (Editors' Suggestion)
Paper by Associate Professor Tajima accepted at the Quantum Information Processing Conference (QIP)
ResearchResearch themes
The lab investigates the relationship between “information and physics.” By combining the mathematical methods of quantum information theory and nonequilibrium thermodynamics and statistical mechanics, it explores the fundamental limits of physical processes and how quantum effects influence those limits.
*Illustrative imageLimits that symmetry imposes on information processing
The lab studies the restrictions that continuous symmetries, such as conservation laws, impose on measurement and quantum computation. Starting from the Wigner-Araki-Yanase theorem, it has shown trade-off relations among symmetry, irreversibility, and quantumness.
*Illustrative imageResource theory of symmetry breaking
The lab is developing the foundations of the resource theory of asymmetry, which quantifies how much the dynamics of a quantum system break symmetry. Its results include a theory of state conversion under U(1) symmetry and a general theory of pure-state conversion for finite groups and compact Lie groups.
*Illustrative imageQuantum advantage in heat engines
In classical heat engines, output power approaches zero as efficiency approaches the Carnot efficiency. The lab has shown that using quantum coherence makes it possible to keep power high while maintaining efficiency close to the Carnot limit.
*Illustrative imageLimits of quantum error mitigation
The lab investigates the lower bound on the unavoidable sampling cost of quantum error mitigation techniques. By applying the mathematical structure of the theorems on symmetry, it derived a lower bound that holds for any error mitigation method, showing a fundamental limit of error mitigation on noisy quantum devices.
MembersFaculty
The members of the Quantum Information Lab consist of faculty, project faculty, visiting faculty, doctoral, master's, and undergraduate students, and technical staff.As of 2026
- Associate ProfessorHiroyasu Tajima
- Project Associate ProfessorYui Kuramochi
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: “Quantum Computing; Ion Trapping ( )” National Institute of Standards and Technology / Public domain (cropped)
- Limits 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: “Spontaneously symmetry breaking” Alice 010 (talk) 23:21, 8 September 2010 (UTC) / Public domain (cropped)
- Quantum advantage in heat engines: “Motor-termico-esquema” Xirintic / CC BY 4.0 (cropped)
- Limits of quantum error mitigation: “6 Transmon Superconducting Quantum Processor without Cheesing 012” OJB Quantum / CC BY 4.0 (cropped)
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