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


Related Research Fields


Research Subjects

  • Solid-state quantum computing
  • Photon-solid state quantum interface
  • Quantum nanomaterials and nanodevices

Selected Publications

  1. 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)
  2. J. Wiedenmann, E. Bocquillon, R.S. Deacon, S. Hartinger, O. Herrmann, T.M. Klapwijk, L. Maier, C. Ames, C. Bru¨ne, C. Gould, A. Oiwa, K. Ishibashi, S. Tarucha, H. Buhmann, and L.W. Molenkamp.:
    "4π-periodic Josephson supercurrent in HgTe-based topological Josephson junctions"
    Nature Communications 7, 10303 (2016)
  3. T. Otsuka, S. Amaha, T. Nakajima, M. Delbecq, J. Yoneda, K. Takeda, R.Sugawara, G. Allison, A. Ludwig, A. Wieck, and S. Tarucha.:
    "Fast probe of local electronic states in nanostructures utilizing a single-lead quantum dot"
    Scientific Report, 5, 14616 (2015)
  4. R.S. Deacon, A. Oiwa, J. Sailer, S. Baba, Y. Kanai, K. Shibata, K. Hirakawa, and S. Tarucha.:
    "Cooper pair splitting in parallel quantum dot Josephson junctions"
    Nature Communications 6, 7446 (2015).
  5. J. Yoneda, T. Otsuka, T. Nakajima, T. Takakura, T. Obata, M. Pioro-Ladrière, H. Lu, C.  J Palmstrøm, A.  C Gossard, and S. Tarucha.:
    "Fast Electrical Control of Single Electron Spins in Quantum Dots with Vanishing Influence from Nuclear Spins"
    Phys. Rev. Lett. 113 (26), 267601 (2014)
  6. S. Chesi, Y-D. Wang, J. Yoneda, T. Otsuka, S. Tarucha, and D. Loss.:
    "Single-spin manipulation in a double quantum dot with micromagnet"
    Phys. Rev. B 90, 235311 (2014)
  7. M. R. Delbecq, T. Nakajima, T. Otsuka, S. Amaha, J. D. Watson, M. J. Manfra, and S. Tarucha.:
    "Full control of quadruple quantum dot circuit charge states in the single electron regime"
    Appl. Phys. Lett. 104 (18), 183111 (2014)
  8. S. Amaha, W. Izumida, T. Hatano, S. Teraoka, S. Tarucha, J. A. Gupta, and D. G. Austing.:
    "Two- and Three-Electron Pauli Spin Blockade in Series-Coupled Triple Quantum Dots"
    Phys. Rev. Lett. 110, 016803 (2013)
  9. T. Fujita, H. Kiyama, K. Morimoto, S. Teraoka, G. Allison, A. Ludwig, A. D. Wieck, A. Oiwa, and S. Tarucha.:
    "Nondestructive Real-Time Measurement of Charge and Spin Dynamics of Photoelectrons in a Double Quantum Dot"
    Phys. Rev. Lett. 110, 266803 (2013)
  10. K. Takeda, T. Obata, Y. Fukuoka, W.M. Akhtar, J. Kamioka, T. Kodera, S. Oda, and S. Tarucha.:
    "Characterization and suppression of low-frequency noise in Si/SiGe quantum point contacts and quantum dots"
    Appl. Phys. Lett. 102, 123113 (2013)

Lab Members

Principal Investigator

Seigo Tarucha
Group Director

Core Members

Tomohiro Otsuka
Research Scientist
Michael Desmond Fraser
Research Scientist
Giles Allison
Research Scientist
Takashi Nakajima
Postdoctoral Researcher
Matthieu Romain Delbecq
Postdoctoral Researcher
Kenta Takeda
Postdoctoral Researcher
Jun Yoneda
Special Postdoctoral Researcher
Hiroshi Kamata
Special Postdoctoral Researcher
Shoko Utsunomiya
Visiting Scientist
Marian Nicola Joachim Marx
Junior Research Associate
Takumi Ito
Student Trainee
Kento Kawasaki
Student Trainee
Akito Noiri
Student Trainee
Taichi Uchida
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
August 7, 2015: RIKEN RESEARCH
Spins in artificial atoms resemble those in natural ones
July 1, 2015: Press Release
Producing spin-entangled electrons