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Koashi Lab
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The lab links quantum theory with information science to explore the possibilities of quantum cryptography and quantum computation.
AboutAbout the lab
Exploring the world woven together by quantum theory and information science
The Koashi Lab studies quantum information and quantum optics, fields where quantum theory and information science meet.
By making good use of the strange behavior of physical systems governed by quantum mechanics, the lab opens paths toward highly secure optical communication and high-speed computation.
Conversely, the lab also aims to re-examine quantum mechanics through the rigorous logic of information science and to approach the fundamental structure of the laws of nature.
Key terms
- Quantum key distribution
- A method that uses quantum properties to share a cryptographic key (random numbers) with a distant party without any third party learning it
- Quantum error correction
- A technique for canceling out the effects of the noise that inevitably occurs inside a quantum computer, so that computation yields correct results
- Quantum many-body system
- A system in which many particles interact with one another and behave according to quantum mechanics
NewsLab news
Assistant Professor Mizuta received the Funai Research Encouragement Award
Research conducted by an alumnus while a student at the lab was published in Nature Physics
Results of joint research with RIKEN were published in Physical Review Letters (PRL)
An alumnus received the TQC 2025 Best Paper Award for research conducted while a student at the lab
ResearchResearch themes
The lab draws out quantum-mechanical properties through the interaction of light and matter, with an eye on their possible applications. At the same time, it aims to approach the fundamental structure of nature from the perspective of information science.
*Illustrative imageTheory of Quantum Key Distribution
In quantum key distribution, two distant parties share secure random numbers through quantum communication. The lab provides theoretical proofs that the keys are truly secure, working on the security of protocols that use continuous variables and of satellite-based communication.
*Illustrative imageQuantum Computation and Quantum Error Correction
The lab studies both quantum error correction, which is essential for large-scale quantum computers, and what small-scale quantum computers without error correction can do. Its targets are error correction for optical quantum computation and variational quantum algorithms.
*Illustrative imageQuantum Algorithms for Quantum Many-Body Systems
Computing quantum many-body systems is a central problem in condensed matter physics and quantum chemistry. The lab studies new methods for examining the accuracy and feasibility of such computations, as well as faster quantum algorithms that exploit the properties of quantum many-body systems.
MembersFaculty
The Koashi Lab consists of faculty members, doctoral and master's students, and visiting researchers.As of 2026
- ProfessorMasato KoashiPublications ↗
- Assistant ProfessorShiro TamiyaPublications ↗
VoicesStudent voices
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RelatedLabs similar to Koashi Lab
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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: “New Quantum Key System Combines Speed, Distance ( )” National Institute of Standards and Technology / Public domain (cropped)
- Theory of Quantum Key Distribution: “Alice e Bob (crittografia quantistica)” Ft1 at Italian Wikipedia / Public domain (cropped)
- Quantum Computation and Quantum Error Correction: “Wigner function squeezed states” Gerd Breitenbach / CC BY-SA 3.0 (cropped)
- Quantum Algorithms for Quantum Many-Body Systems: “GHZ State” Lere01 / CC0 (cropped)
- Related lab (Shibauchi-Ishida Lab): “Quantum locking” Maxim Bilovitskiy / CC BY-SA 4.0 (cropped)
- Related lab (Kobayashi Lab): “Femtosecond Laser and Pulse Compressor - Optics Lab - INRIM” Giorgio Brida from Torino, Italy / CC BY 2.0 (cropped)
- Related lab (Ideue Lab): “Graphen” AlexanderAlUS / CC BY-SA 3.0 (cropped)
- Related lab (Ashihara Lab): “Femtosecond Laser and Pulse Compressor - Optics Lab - INRIM” Giorgio Brida from Torino, Italy / CC BY 2.0 (cropped)
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