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Yamashita-Kato Lab
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The lab uses superconductivity to build quantum computers and photon detectors.
AboutAbout the lab
Fusing superconductivity and magnetism to create new quantum devices
The Yamashita Lab, in the field of low-temperature and superconductivity physics, works on creating new quantum devices and quantum circuits using superconductors, magnetic materials, and its own technologies that combine the two.
Its main research themes are superconducting quantum computers, hybrid quantum devices of superconductors and magnetic materials, and superconducting single-photon detectors.
The lab also works on discovering new high-temperature superconducting materials.
Key terms
- Qubit
- A basic building block of a quantum computer. This lab works on transmon-type and flux-type qubits
- π-junction
- A type of hybrid junction made by combining a superconductor and a magnetic material
- Single photon
- A quantum of light. The lab studies how to detect it accurately with detectors made of superconducting nanofilms
NewsLab news
A paper by Assistant Professor Kutsuma was published
A fourth-year undergraduate student received awards including the Dean of the School of Engineering Award
A doctoral student received the Research Encouragement Award from the Superconductivity Division of the Japan Society of Applied Physics
Professor Yamashita received the Paper Award from the Superconductivity Division of the Japan Society of Applied Physics
ResearchResearch themes
The lab aims to create new quantum devices and quantum circuits using superconductors, magnetic materials, and technologies that combine the two. With research on quantum computers, hybrid quantum devices, and photon detectors as its pillars, it also takes on the discovery of new high-temperature superconducting materials.
*Illustrative imageSuperconducting quantum computers
The lab pursues research and development of quantum computers, which are expected to solve, at dramatically higher speed, problems that current computers struggle with. It works on transmon qubits and flux qubits made from nitride superconducting materials, and on improving their scalability.
*Illustrative imageHybrid superconductor-magnet devices
Combining superconductors and magnetic materials, which have long been considered incompatible, gives rise to new physical phenomena that overturn conventional wisdom. The lab focuses on hybrid junctions called π-junctions and works on applying them to qubits and quantum amplifiers.
*Illustrative imageSuperconducting single-photon detectors
Technology for detecting single photons accurately is in growing demand in a wide range of fields, including quantum communication, space communication, and life sciences. The lab aims to improve the performance and functionality of detectors that use superconducting nanofilms, from the perspectives of superconducting materials, device structure, and physics.
MembersFaculty
The members of the Yamashita Lab are faculty members, project assistant professors, academic researchers, doctoral, master's, and undergraduate students, and a secretary.As of 2026
- ProfessorTaro Yamashita
- Associate ProfessorMasatsune Kato
- Assistant ProfessorHiroki Kutsuma
- Project Assistant ProfessorCiro Bruscino
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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: “Measuring a qubit leaves no room for error” FMNLab / CC BY 4.0 (cropped)
- Superconducting quantum computers: “Gold Cryostat 8K-4” Onri Jay Benally / CC BY-SA 2.0 (cropped)
- Hybrid superconductor-magnet devices: “Superconducting Metamaterial Chip 003” OJB Quantum / CC BY 4.0 (cropped)
- Superconducting single-photon detectors: “SNSPD Single-Quantum” Geek3 / CC BY-SA 4.0 (cropped)
- Related lab (Oogane-Nakano Lab): “Tchibo Electronic Puzzle - board-4451” Raimond Spekking / CC BY-SA 4.0 (cropped)
- Related lab (Advanced Spintronics Medical Application Engineering Joint Research Lab): “Hall sensor square van der Pauw Geometry” Panoga / CC BY-SA 4.0 (cropped)
- Related lab (Spintronics Lab): “NXP PCF8577C LCD driver with I²C (Colour Corrected)” cole8888, https://flickr.com/photos/ @N05/ (aka Cole L) / CC BY-SA 2.0 (cropped)
- Related lab (Next-Generation Spin Electronics Materials Engineering [Tsunoda] Lab): “Actuator arm assembly of a hard disk drive” Mk2010 / CC BY 4.0 (cropped)
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