Centers & Labs

RIKEN Center for Emergent Matter Science

Superconducting Quantum Electronics Research Team

Team Leader: Yasunobu Nakamura (D.Eng.)
Yasunobu  Nakamura(D.Eng.)

We study quantum electronics in superconducting circuits and hybrid quantum systems. The targets of our research include quantum information processing and ultra-sensitive measurement based on quantum mechanical properties of the circuits. Superconducting quantum circuits offer excellent tools for the purposes. Let us celebrate the century of quantum engineering together!

Main Research Field


Related Research Fields


Research Subjects

  • Quantum information processing with superconducting circuits
  • Microwave quantum optics in superconducting circuits
  • Hybrid quantum systems

Selected Publications

  1. Nakamura, Y., Pashkin, Yu. A., and Tsai, J. S.:
    "Coherent control of macroscopic quantum states in a single-Cooper-pair box"
    Nature 398, 786 (1999).
  2. Chiorescu, I., Nakamura, Y., Harmans, C. J. P. M., and Mooij, J. E.:
    "Coherent quantum dynamics of a superconducting flux-qubit"
    Science 299, 1869 (2003).
  3. Yamamoto, T., Pashkin, Yu. A., Astafiev, O., Nakamura, Y., and Tsai, J. S.:
    "Demonstration of conditional gate operation using superconducting charge qubit"
    Nature 425, 941-944 (2003).
  4. Yoshihara, F., Harrabi, K., Niskanen, A. O., Nakamura, Y., and Tsai, J. S.:
    "Decoherence of flux qubits due to 1/f flux noise "
    Phys. Rev. Lett. 97, 167001 (2006).
  5. Niskanen, A. O., Harrabi, K., Yoshihara, F., Nakamura, Y., Lloyd, S., and Tsai, J. S.:
    "Quantum coherent tunable coupling of superconducting qubits"
    Science 316, 723 (2007).
  6. Yamamoto, T., Inomata, K., Watanabe, M., Matsuba, K., Miyazaki, T., Oliver, W. D., Nakamura, Y., and Tsai, J. S.:
    "Flux-driven Josephson parametric amplifier"
    Appl. Phys. Lett. 93, 042510 (2008).
  7. Astafiev, O., Zagoskin, A. M., Abdumalikov, Jr., A. A., Pashkin, Yu. A., Yamamoto, T., Inomata, K., Nakamura, Y., and Tsai, J. S.:
    "Resonance fluorescence of a single artificial atom"
    Science 327, 840 (2010).
  8. Ladd, T. D., Jelezko, F., Laflamme, R., Nakamura, Y., Monroe, C., and O’Brien, J. L.:
    "Quantum Computing"
    Nature 464, 45 (2010).
  9. Koshino, K., Inomata, K., Yamamoto, T., and Nakamura, Y.,:
    "Implementation of an impedance-matched Λ system by dressed-state engineering"
    Phys. Rev. Lett. 111, 153601 (2013).
  10. Lin, Z.R., Inomata, K., Koshino, K., Oliver,W.D., Nakamura, Y., Tsai, J.S., and Yamamoto, T.:
    “Josephson parametric phase-locked oscillator and its application to dispersive readout of superconducting qubits”
    Nature Commun. 5, 4480 (2014).

Lab Members

Principal Investigator

Yasunobu Nakamura
Team Leader

Core Members

Hiroki Ikegami
Senior Research Scientist
Kunihiro Inomata
Research Scientist
Hiroyasu Tajima
Special Postdoctoral Researcher
Zhirong Lin
Foreign Postdoctoral Researcher
Pierre-Marie Billangeon
Visiting Scientist
Michael Marthaler
Visiting Scientist
Koichi Kusuyama
Technical Staff I
Koh-ichi Nittoh
Technical Staff I

Contact information

S401, Bioscience Building, 2-1 Hirosawa, Wako, Saitama
351-0198, Japan

Email: yasunobu.nakamura [at]

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