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RIKEN Center for Quantum Computing Superconducting Quantum Electronics Research Team

Team Leader: Yasunobu Nakamura (Ph.D.)

Research Summary

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 Fields

  • Interdisciplinary Science & Engineering

Related Research Fields

  • Mathematical & 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).

Recent Research Results

Lab Members

Principal investigator

Yasunobu Nakamura
Team Leader

Core members

Shuhei Tamate
Research Scientist
Alexander Badrutdinov
Research Scientist
Chung Wai Sandbo Chang
Special Postdoctoral Researcher
Zhiguang Yan
Postdoctoral Researcher
Rui Li
Postdoctoral Researcher
Chih-Chiao Hung
Postdoctoral Researcher
Zhiling Wang
Postdoctoral Researcher
Shiyu Wang
Postdoctoral Researcher
Koichi Kusuyama
Senior Technical Staff
Hikota Akimoto
Senior Technical Staff
Laszlo Szikszai
Technical Staff I
Harumi Hayakawa
Technical Staff I
Yuji Sakoda
Technical Staff I
Machie Kaito
Technical Staff I
Peter Anthony Spring
Visiting Researcher
Arjan Ferdinand van Loo
Visiting Scientist


Position Deadline
Seeking a Technical Staff I (W23332) Open until filled
Seeking a Research Scientist / Postdoctoral Researcher (W23076) Open until filled

Contact Information

Bldg.S51 Room E201,
2-1 Hirosawa,
Wako, Saitama,
351-0198, Japan
Email: yasunobu.nakamura [at] riken.jp