Quantum Device Research Team

Mission

We conduct research on improving the performance and scalability of superconducting qubits from the perspectives of materials, processes, and design, toward the realization of superconducting quantum computers. In addition, we promote research on superconducting integrated circuits and three-dimensional packaging technologies applicable to superconducting quantum computers. We also develop, maintain, and support users of the cleanroom (Qufab), which is essential for these device-related research activities.

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Research on improving the performance and scalability of superconducting qubits

Research on next-generation superconducting electronics

Management and operation of the shared device prototyping facility (Qufab)

Team Research Topics

Research on improving the performance and scalability of superconducting qubits

We conduct research on improving the performance and scalability of superconducting qubits in superconducting quantum computers from the perspectives of materials, processes, and design. This research is carried out under the NEDO project "Integrated Research and Development of Quantum Computing and Ising Computing Systems"

Top-view SEM image of an Al/AlOx/Al Josephson junction

Relationship between the internal Q factor and the average photon number of an Nb resonator with and without a Ta cap layer (Y. Urade et al., Extended Abstracts of the 2022 International Conference on Solid State Devices and Materials, 2022, pp191-192.)

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Research on next-generation superconducting electronics

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Management and operation of the shared device prototyping facility (Qufab)


We manage and operate the shared device prototyping facility (Qufab). This facility is a 4-inch device fabrication line that provides process access and prototyping services. Qufab enables the fabrication of superconducting qubits and circuits, superconducting digital and analog integrated circuits, and superconducting three-dimensional integration.

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Staff Members (As of July. 1st, 2026)

photo	position & name	field of expertise
	Team Leader, Go FUJII	Superconducting Device Fabrication, Development of Superconducting X-ray Spectroscopy Systems
	Joint Appointed Fellow, Daiyu KONDO
	Senior Researcher, Nobuyuki ZEN	Superconductivity arising in a phonon-engineered metallic film ; Superconducting particle detectors
	Senior Researcher, Yoshiro URADE	Superconducting quantum circuits for fault-tolerant quantum computing, including process technologies, materials, and Josephson parametric amplifiers.
	Senior Researcher, Makoto KONOTO	Development of high-performance superconducting qubits using advanced semiconductor processes
	Researcher, Yuichi FUJITA	Materials Science for Quantum Processors, Solid State Physics, Electronics
	Invited Senior Researcher, Tetsuro SATOU	Fabrication of superconducting devices and circuits
	Invited Senior Researcher, Mutsuo HIDAKA	Fabrication process for superconducting integrated devices
	Invited Senior Researcher, Yukihiro TOMINARI	Research and development of Superconducting device, Optical device, and Terahertz electromagnetic wave
	Senior Researcher, Yusuke HORINOUCHI
	Concurrent post, Hidehiro ASAI
	Concurrent post, Yuuki ARAGA	Analysis and measurement of electromagnetic interference among 3-D stacked ICs ; Development of method to stack superconductive chips using micro-bump or direct bonding
	Concurrent post, Shota IIZUKA	Development of Silicon quantum bit
	Concurrent post, Takumi INABA
	Concurrent post, Hiroshi OKA	Semiconductor Device Technology for Quantum Computers ; Development of high-mobility Transitors
	Concurrent post, Kimihiko KATO	Silicon tunnel field-effect transistor ; Silicon quantum bit
	Concurrent post, Katsuya KIKUCHI	Research and development of three-dimensional integrated circuit technology
	Concurrent post, Takahiro KIKUCHI	Research on Frequency-Multiplexed Readout of Superconducting Transition-Edge Sensors
	Concurrent post, Fumihiro CHINA	Research on superconducting logic circuits and superconducting device fabrication
	Concurrent post, Kazumasa MAKISE
	Concurrent post, Takahiro MORI
	Concurrent post, Hirotake YAMAMORI