Yutaka Tabuchi

Unit Leader, Superconducting Quantum Computing System Research Unit


We study novel devices and architectures based on quantum mechanics. Recently, we are getting ready to control precisely in a quantum limit a single elementary excitation in various solid-state systems. For example, single excitation of surface plasmon polariton modes on the superconducting electrode can be an information carrier of quantum states |0> and |1>, and it is called a quantum bit. We integrate these physical systems to make them into information processing systems.

Research Theme (Past and Current)

・Research on the integration of superconducting computers
・Quantum repeaters using magnons in ferromagnet

Representative Research Results

Paper [1] D. Lachance-Quirion, S. Wolski, Y. Tabuchi, S. Kono, K. Usami, Y. Nakamura: "Entanglement-based single-shot detection of a single magnon with a superconducting qubit", Science 367, pp.425-428 (2020). [2] S. Kono, K. Koshino, Y. Tabuchi, A. Noguchi, Y. Nakamura: "Quantum non-demolition detection of an itinerant microwave photon", Nature Physics 14, pp.546-549 (2018) [3] Y. Tabuchi, S. Ishino, A. Noguchi, T. Ishikawa, R. Yamazaki, K. Usami, Y. Nakamura: "Coherent coupling between a ferromagnetic magnon and a superconducting qubit", Science 348, pp.405-408 (2015) Press releases: [4] A Spookily Good Sensor (February 20, 2020)


Integrated quantum circuits: We explore a tileable qubit- and I/O-structure design to give horizontal extendability to the device. (The image is licensed under CC-BY-SA 4.0)


Stacked quantum module: We stack multiple substrates on the qubit chip to ensure extendability. (The image is licensed under CC-BY-SA 4.0)

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