The Kosaka Laboratory researches quantum information technologies at Yokohama National University. Our work focuses on developing diamond quantum computers, diamond quantum repeaters, diamond quantum internet, and diamond quantum storage.
Through the fusion of light and quantum technology, our students and researchers are working together to open up new possibilities for future society.
You can explore our latest research outcomes and activities in the following sections: News, Publications, and Research.
Diamond is known as the hardest gemstone, but when doped with impurities and heat-treated, it transforms into the most robust quantum memory, capable of preserving quantum states for seconds. For example, when nitrogen is introduced, it forms a nitrogen-vacancy (NV) center, a type of color center. Surrounding these centers are numerous carbon isotopes with spin, which serve as quantum memories lasting for minutes.
By using such ensembles of quantum memories within diamonds, we can realize phenomena known as quantum teleportation, something that once seemed like science fiction.
Building on this principle, our team has successfully demonstrated quantum repeaters, the core component of a future quantum internet, and continues advancing research toward that ambitious goal.
At our lab, we are working toward realizing quantum computers and quantum networks by developing quantum interfaces and quantum repeaters.
These goals are defined by projects and carried out through the Quantum Information Research Center (QIC) at Yokohama National University, where I serve as director. Through QIC, we collaborate with leading researchers from Japan and abroad.
Our students and researchers are encouraged to pursue diverse career paths while tackling fascinating scientific challenges that aim to bring innovation to future society.
If you are interested in quantum technology, we welcome you to join our activities.
We are also open to discussions on research collaboration and project proposals.
Cabinet Office Moonshot Research and Development Program – Goal 6
Development of Quantum Interfaces for Building Quantum Computer Networks
Project period: FY2020–FY2025
the Ministry of Internal Affairs and Communications
Research and Development of Key Technologies for Realizing the Quantum Internet
Project period: FY2023–FY2027
JST ASPIRE Program
Japan-Germany Quantum Technologies Joint Research Project
Project period: FY2025–FY2029
The QIC Releases New Video Highlighting Its Research Activities
The Quantum Information Research Center (QIC) was established, and Professor Kosaka was appointed as its director.
