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Takagi Lab
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A quantum information theory lab that uncovers the essence of quantum systems from an information-theoretic perspective.
AboutAbout the lab
The essence of quantum systems, from an operational perspective.
Takagi Lab conducts fundamental research in quantum information theory.
Drawing on perspectives from physics, information science, and computational science, the lab clarifies the essential properties of quantum systems from an operational viewpoint.
Its main research topics include quantum resource theory, quantum entanglement theory, and quantum thermodynamics.
Founded in 2024, it is a new lab on the Komaba Campus.
Key terms
- Quantum resource theory
- A framework that quantifies properties unique to quantum systems as "resources" and studies how far they can be converted
- Quantum entanglement
- A phenomenon in which multiple quantum systems become linked so that their states remain correlated even when they are far apart
- Quantum thermodynamics
- A field of theory that treats the exchange of heat and work under the rules of the quantum world
NewsLab news
Paper on the performance of unitary purification of quantum channels posted to arXiv
Associate Professor Takagi received the Young Scientists' Award in the Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology
A doctoral student received the Student Presentation Award at the Workshop on Quantum Information Technology (QIT53)
Paper showing that work can be extracted without knowing the quantum state published in Nature Communications
Paper on a noise suppression method using symmetry published in PRX Quantum
ResearchResearch themes
The lab draws on perspectives from physics, information science, and computational science to clarify the essential properties of quantum systems from an operational viewpoint. It has broad interest in problems across quantum information, with a particular focus on quantum resource theory and quantum thermodynamics.
*Illustrative imageQuantum Resource Theory
The lab treats properties unique to quantum systems as "resources" and studies how much can be extracted and how far they can be converted. It works on magic state distillation and proposes new frameworks for distillation.
*Illustrative imageQuantum Entanglement Theory
The lab studies the entanglement that arises between distant quantum systems from a theoretical standpoint. This is one of the research topics the lab focuses on most.
*Illustrative imageQuantum Thermodynamics
The lab studies how heat and work can be handled in the quantum world. It has shown that work can be extracted without knowing information about the quantum state, with the same performance as when that information is known.
*Illustrative imageQuantum Information Theory of Continuous-Variable Systems
The lab studies quantum systems with continuous degrees of freedom. It has proposed a method for classically simulating quantum circuits of such systems by decomposing them into Gaussian states.
MembersFaculty
Takagi Lab consists of faculty members, postdoctoral researchers, graduate students in the doctoral and master's programs, and undergraduate students.As of 2026
- Associate ProfessorRyuji Takagi
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 Computer with Dispersive Background” OJB Quantum / CC BY 4.0 (cropped)
- Quantum Resource Theory: “Superconducting Quantum Chip with Dispersive Background” OJB Quantum / CC BY 4.0 (cropped)
- Quantum Entanglement Theory: “Biphoton symbolic representation” Neolexx / CC BY-SA 3.0 (cropped)
- Quantum Thermodynamics: “Quantum Cats ( )” National Institute of Standards and Technology / Public domain (cropped)
- Quantum Information Theory of Continuous-Variable Systems: “Microwave Apparatus ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Nonequilibrium Theory Lab (Ikeda Group)): “Mayonnaise (1)” jules / CC BY 2.0 (cropped)
- Related lab (Noumi Lab): “202029-New-History v3 3200” NASA / Public domain (cropped)
- Related lab (Yokogawa Lab): “Separatory funnel with oil and colored water” PRHaney / CC BY-SA 3.0 (cropped)
- Related lab (Kato Lab): “Liquid helium Rollin film” I, AlfredLeitner, took this photograph as part of my movie "Liquid Helium,Superfluid" / Public domain (cropped)
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