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RIKEN Center for Emergent Matter Science Quantum Functional System Research Group

Group Director: Seigo Tarucha (D.Eng.)

Research Summary

Seigo Tarucha

Hardware and underlying physics for quantum information processing with quantum control of soli-state quantum states are studied. Quantum information processing is an ideal information technology whose operation accompanies low-energy dissipation and high information security. The purpose of this laboratory is to demonstrate ability of the solid-state information processing using quantum operations of quantum coherence and entanglement in semiconductor and superconductor nanostructures and finally outline a path for the realization. The specific research targets are"quantum computing"including quantum logic operation and quantum simulation, "quantum interface" which can offer quantum memory and relay, and "quantum nanodevices"relavent for the quantum control. Architectures for best suited quantum systems, science and technology for both materials and devices, and fundamental physics of quantum entanglement decoherence and spin correlation are investigated.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Informatics
  • Engineering


  • Semiconductor quantum dots
  • Quantum wire
  • Quantum computation
  • Topological quantum computation
  • Quantum transport

Selected Publications

  • 1. K. Takeda, A. Noiri, T. Nakajima, L. C. Camenzind, T. Kobayashi, A. Sammak, G. Scappucci, and S. Tarucha,
    "Rapid single-shot parity spin readout in a silicon double quantum dot with fidelity exceeding 99%",
    npj Quantum Info. 10, 22 (2024).
  • 2. Y. del Valle Inclan Redondo, X. Xu, T. C. H. Liew, E. A. Ostrovskaya, A. Stegmaier, R. Thomale, C. Schneider, S. Klembt, S. Hofling, S. Tarucha and M. D. Fraser,
    "Nonreciprocal bandstructures in an exciton-polariton Floquet optical lattice",
    Nature Photonics (2024) accepted.
  • 3. J. Yoneda, J. S. Rojas-Arias, P. Stano, K. Takeda, A.Noiri, T. Nakajima, D. Loss, and S. Tarucha,
    "Noise-correlation spectrum for a pair of spin qubits in silicon",
    Nature Physics 19, 1793-1798, Oct (2023).
  • 4. S. Matsuo, T. Imoto, T. Yokoyama, Y. Sato, T. Lindemann, S. Gronin, G.C. Gardner, M.J. Manfra, and S. Tarucha,
    "Josephson diode effect derived from short-range coherent coupling",
    Nature Physics 19, 1636 (2023).
  • 5. A.Noiri, K. Takeda, T. Nakajima, T. Kobayashi, A. Sammak, G. Scappucci, and S. Tarucha,
    "A shuttling-based two-qubit logic gate for linking distant silicon quantum processors",
    Nature Commun. 13, 5740 (2022).
  • 6. K. Takeda, A. Noiri, T. Nakajima, T. Kobayashi, and S. Tarucha,
    "Quantum error correction with silicon spin qubits”
    Nature 608, 682 (2022)
  • 7. A. Noiri, K. Takeda, T. Nakajima, T. Kobayashi, A. Sammak, G. Scappucci, and S. Tarucha,
    "Fast universal quantum gate above the fault-tolerance threshold in silicon",
    Nature 601, 338 (2022).
  • 8. K. Takeda, A. Noiri, T. Nakajima, J. Yoneda, T. Kobayashi, and S. Tarucha,
    "Quantum tomography of an entangled three-qubit state in silicon”
    Nat. Nanotechnol. 16. 965 (2021).
  • 9. T. Nakajima, A. Noiri, K. Kawasaki, J. Yoneda, P. Stano, S. Amaha, T. Otsuka, K. Takeda, M.R. Delbecq, G. Allison, A. Ludwig, A. D. Wieck, D. Loss, and S. Tarucha,
    "Coherence of a driven electron spin qubit actively decoupled from quasi-static noise",
    Phys. Rev. X 10, 011060-1-11 (2020).
  • 10. J. Yoneda, K. Takeda, T. Otsuka, T. Nakajima, M. R. Delbecq, G. Allison, T. Honda, T. Kodera, S. Oda, Y. Hoshi, N. Usami, K. M. Itoh, and S. Tarucha,
    "A quantum-dot spin qubit with coherence limited by charge noise and fidelity higher than 99.9%",
    Nature. Nanotechnol. 13, 102 (2018).

Recent Research Results

Related Links

Lab Members

Principal investigator

Seigo Tarucha
Group Director

Core members

Takashi Nakajima
Senior Scientist
Kenta Takeda
Senior Scientist
Akito Noiri
Research Scientist
Sadashige Matsuo
Research Scientist
Ikkyeong Jin
Postdoctoral Researcher
Soichiro Teraoka
Technical Staff I
Leon Luca Caspar Camenzind
Visiting Researcher
Michael Desmond Fraser
Senior Visiting Scientist
Tomohiro Otsuka
Visiting Scientist
Yago Baltasar Del Valle Inclan Redondo
Visiting Scientist
Raisei Mizokuchi
Visiting Scientist
Go Shinkai
Visiting Scientist
Chutian Wen
Junior Research Associate
Yi-Hsien Wu
International Program Associate
Shohei Kobayashi
Student Trainee
Ryutaro Matsuoka
Student Trainee
Patrick Buetler


Position Deadline
Seeking a Postdoctoral Researchers (W23334) Open until filled
Seeking a Postdoctoral Researcher (W23293) Open until filled

Contact Information

Email: tarucha [at] riken.jp