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

Interdisciplinary science and engineering

Related Research Fields

Mathematical and physical sciences


  • Superconductivity
  • Quantum mechanics
  • Quantum optics
  • Quantum information

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. 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).
  5. 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).
  6. 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).
  7. 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).
  8. 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).
  9. Inomata, K., Koshino, K., Lin, Z.R., Oliver, W.D., Tsai, J.S., Nakamura, Y., and Yamamoto, T.:
    "Microwave down-conversion with an impedance-matched Λ system in driven circuit QED"
    Phys. Rev. Lett. 113, 063604 (2014).
  10. Inomata, K., Lin, Z.R., Koshino, K., Oliver, W.D., Tsai, J.S., Yamamoto, T., and Nakamura, Y.:
    "Single microwave-photon detector using an artificial Λ-type three-level system"
    Nature Commun. 7, 12303 (2016).

Lab Members

Principal Investigator

Yasunobu Nakamura
Team Leader

Core Members

Hiroki Ikegami
Senior Research Scientist
Yoshiro Urade
Postdoctoral Researcher
Kun Zuo
Postdoctoral Researcher
Kirill Shulga
Postdoctoral Researcher
Hiroyasu Tajima
Special Postdoctoral Researcher
Zhirong Lin
Foreign Postdoctoral Researcher
Tsuyoshi Yamamoto
Visiting Scientist
Kunihiro Inomata
Visiting Scientist
Michael Marthaler
Visiting Scientist
Koichi Kusuyama
Technical Staff I
Koh-ichi Nittoh
Technical Staff I

Contact information

Bldg.S01 Room S403, 2-1 Hirosawa, Wako, Saitama
351-0198, Japan

Email: yasunobu.nakamura [at]

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