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Quantum Computing Lab
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A lab that studies quantum computers, which compute using the principles of quantum mechanics.
AboutAbout the lab
Your ideas will create new physics and the future of computing
The Quantum Computing Lab conducts research at the interface of information and physics, centered on quantum computers, next-generation computers that compute using the principles of quantum mechanics.
The lab studies quantum error correction, which counters the noise that large-scale quantum computers must overcome, and applications of small- and medium-scale NISQ devices to quantum chemistry calculations and quantum machine learning.
The lab's research is interdisciplinary, drawing on knowledge from a wide range of fields such as fundamental physics, computer science, programming, and machine learning.
Fourth-year undergraduates assigned to the lab first build foundational knowledge by taking turns presenting a quantum information textbook in English in a reading group, and then choose their research topics.
Key terms
- Qubit
- The smallest unit of information in the quantum world. Unlike a classical bit, which is fixed as either 0 or 1, it is represented by an analog quantity.
- Quantum error correction
- A theory that uses entangled quantum states to protect quantum information from noise.
- NISQ
- Noisy Intermediate-Scale Quantum computers, meaning medium-scale quantum computers that contain noise. The machines currently available at the scale of tens of qubits are called by this name.
NewsLab news
A doctoral student received the Student Presentation Award at the 53rd Quantum Information Technology Workshop (QIT53)
Students received awards including the School of Engineering Science Award at the bachelor's and master's thesis presentations
A student received the Student Encouragement Award at the 16th QS Workshop
Prof. Fujii published the book "Kyoyo to shite no Ryoshi Konpyuta" (Quantum Computers as General Education)
A student received the Outstanding Presentation Award at the 15th QS Workshop
ResearchResearch themes
The lab studies the interface of quantum science and information, centered on quantum computers that put quantum-mechanical properties such as superposition and entanglement to use in computation. A single group covers everything from theory and numerical computation close to the hardware through to applications.
*Illustrative imageApplied research on quantum computers
This research applies current quantum computers (NISQ devices) to condensed matter physics, quantum chemistry calculations, and machine learning. The quantum circuit learning algorithm published by this lab is a machine learning method that uses NISQ devices.
*Illustrative imageQuantum error correction and fault-tolerant quantum computation
To protect quantum states that are vulnerable to noise, the lab studies the theory of quantum error correction, which entangles many qubits. Toward the demonstration of error correction, it aims to contribute through proposals of new schemes, theoretical analysis, and numerical performance evaluation.
*Illustrative imageComplexity of quantum computation and quantum speedup
The lab approaches the difference between quantum and classical by looking at the difference in which problems quantum and classical computers can solve efficiently. It also investigates what kind of quantumness, when added to models that classical computers can simulate efficiently, makes them hard to simulate.
*Illustrative imageQuantum software research and development
As part of the Quantum Software Research Hub, for which Prof. Fujii serves as principal investigator, the lab works on quantum circuit synthesis and optimization, noise mitigation techniques, and the construction of algorithms in which quantum computers and supercomputers cooperate.
MembersFaculty
The members of the Quantum Computing Lab are the faculty, collaborating members (a Project Associate Professor, Project Assistant Professors, and researchers), technical assistants, a lab secretary, and doctoral and master's students.As of 2026
- ProfessorKeisuke Fujii
- Associate ProfessorKosuke Mitarai
- Project Associate ProfessorHideaki Hakoshima
- Project Assistant ProfessorKen Okada
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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: “Superconducting Metamaterial Chip” OJB Quantum / CC BY 4.0 (cropped)
- Applied research on quantum computers: “Measuring a qubit leaves no room for error” FMNLab / CC BY 4.0 (cropped)
- Quantum error correction and fault-tolerant quantum computation: “Quantum Error Correction On Three Quibits with no Ancilla” Will Apodaca / CC BY-SA 4.0 (cropped)
- Complexity of quantum computation and quantum speedup: “Quantum circuit that exhibits Parity Measurement” Vtomole / CC BY-SA 4.0 (cropped)
- Quantum software research and development: “Deutsch-Jozsa-algorithm-quantum-circuit” Peplm / CC BY-SA 4.0 (cropped)
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- Related lab (イオントラップ量子計測): “Ion Trap ( )” National Institute of Standards and Technology / Public domain (cropped)
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分光): “Aust.-Synchrotron,-Storage-Ring-Magnets” jjron / CC BY-SA 3.0 (cropped)
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