Centers & Labs

RIKEN Center for Emergent Matter Science

Quantum Functional System Research Group

Group Director: Seigo Tarucha (D.Eng.)
Seigo  Tarucha(D.Eng.)

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 Field

Mathematical and physical sciences

Related Research Fields

Informatics / Engineering


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

Selected Publications

  1. T. Otsuka, T. Nakajima, M. R. Delbecq, S. Amaha, J. Yoneda, K. Takeda, G. Allison, T. Ito, R. Sugawara, A. Noiri, A. Ludwig, A. D. Wieck, and S. Tarucha,
    "Single-electron Spin Resonance in a Quadruple Quantum Dot",
    Scientific Reports 6 31820 (2016)
  2. K. Takeda, J. Kamioka, T. Otsuka, J. Yoneda, T. Nakajima, M. R. Delbecq, S. Amaha, G. Allison, T. Kodera, S. Oda, and S. Tarucha,
    "A fault-tolerant addressable spin qubit in a natural silicon quantum dot",
    Science Advances 2 e1600694 (2016)
  3. A. Noiri, J. Yoneda, T. Nakajima, T. Otsuka, M. R. Delbecq, K. Takeda, S. Amaha, G. Allison, A. Ludwig, A. D. Wieck, S. Tarucha,
    "Coherent electron-spin-resonance manipulation of three individual spins in a triple quantum dot",
    Appl. Phys. Lett. 108 153101 (2016)
  4. M.R. Delbecq, T. Nakajima, P. Stano, T. Otsuka, S. Amaha, J. Yoneda, K. Takeda, G. Allison, A. Ludwig, A.D. Wieck, and S. Tarucha.:
    "Quantum dephasing in a gated GaAs triple quantum dot due to non-ergodic noise"
    Phys. Rev. Lett. 116, 0468020 (2016)
  5. I. Sohn, S. Tarucha, and B.S. Choi,
    "Analysis of physical requirements for simple three-qubit and nine-qubit quantum error correction on quantum-dot and superconductor qubits",
    Phys. Rev. A 95, No. 1, pp.012306-1-7, 2017.
  6. S. Hermelin, B. Bertrand, S. Takada, M. Yamamoto, S. Tarucha, A. Ludwig, A.D. Wieck, C. Bäuerle, and T. Meunier,
    "Classical information transfer between distant quantum dots using individual electrons in fast moving quantum dots",
    Phys. Status Solidi B 254, No. 3, pp.1600673-1-12 (2017).
  7. T. Ito, T. Otsuka, S. Amaha, M.R. Delbecq, T. Nakajima, J. Yoneda, K. Takeda, G. Allison, A. Noiri, K. Kawasaki, and S. Tarucha,
    "Detection and control of charge states in a quintuple quantum dot",
    Scientific Reports 6, pp. 39113-1-7 (2016).
  8. T. Fujita, P. Stano, G. Allison, K. Morimoto, Y. Sato, M. Larsson, J.-H. Park, A. Ludwig, A.D. Wieck, A. Oiwa, and S. Tarucha,
    "Signatures of hyperfine, spin-orbit, and decoherence effects in a Pauli spin blockade",
    Phys. Rev. Lett. 117, No. 20, pp.206802-1-6 (2016).
  9. H. Kiyama, T. Nakajima, S. Teraoka, A. Oiwa, and S. Tarucha,
    "Single-shot ternary readout of two-electron spin states in a quantum dot using spin filtering by quantum Hall edge states",
    Phys. Rev. Lett. 117, No.23, pp.236802-1-5 (2016).
  10. Y. Yamaoka, K. Iwasaki, S. Oda and T. Kodera
    "Charge sensing and spin-related transport property of p-channel silicon quantum dots"
    Jpn. J. Appl. Phys. 56, 04CK07-1-4, 2017

Lab Members

Principal Investigator

Seigo Tarucha
Group Director

Core Members

Takashi Nakajima
Research Scientist
Tomohiro Otsuka
Research Scientist
Michael Desmond Fraser
Research Scientist
Kenta Takeda
Postdoctoral Researcher
Akito Noiri
Postdoctoral Researcher
Sen Li
Postdoctoral Researcher
Jun Yoneda
Special Postdoctoral Researcher
Hiroshi Kamata
Special Postdoctoral Researcher
Marian Nicola Joachim Marx
Visiting Technician
Takumi Ito
Student Trainee

Contact information

Email: tarucha [at]

Related links

Recent research results

April 14, 2017: RIKEN RESEARCH
Putting a block on dot-to-dot
December 16, 2016: RIKEN RESEARCH
Exotic quantum technology realized using normal silicon
July 1, 2015: Press Release
Producing spin-entangled electrons