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Observation and manipulation of quantum interference in a superconducting Kerr parametric oscillator

Author

Listed:
  • Daisuke Iyama

    (Tokyo University of Science
    RIKEN Center for Quantum Computing (RQC))

  • Takahiko Kamiya

    (Tokyo University of Science
    RIKEN Center for Quantum Computing (RQC))

  • Shiori Fujii

    (Tokyo University of Science
    RIKEN Center for Quantum Computing (RQC))

  • Hiroto Mukai

    (RIKEN Center for Quantum Computing (RQC)
    Tokyo University of Science)

  • Yu Zhou

    (RIKEN Center for Quantum Computing (RQC))

  • Toshiaki Nagase

    (Tokyo University of Science
    RIKEN Center for Quantum Computing (RQC))

  • Akiyoshi Tomonaga

    (RIKEN Center for Quantum Computing (RQC)
    Tokyo University of Science)

  • Rui Wang

    (RIKEN Center for Quantum Computing (RQC)
    Tokyo University of Science)

  • Jiao-Jiao Xue

    (RIKEN Center for Quantum Computing (RQC)
    Xi’an Jiaotong University)

  • Shohei Watabe

    (Shibaura Institute of Technology)

  • Sangil Kwon

    (Tokyo University of Science)

  • Jaw-Shen Tsai

    (RIKEN Center for Quantum Computing (RQC)
    Tokyo University of Science
    Tokyo University of Science)

Abstract

Quantum tunneling is the phenomenon that makes superconducting circuits “quantum”. Recently, there has been a renewed interest in using quantum tunneling in phase space of a Kerr parametric oscillator as a resource for quantum information processing. Here, we report a direct observation of quantum interference induced by such tunneling and its dynamics in a planar superconducting circuit through Wigner tomography. We experimentally elucidate all essential properties of this quantum interference, such as mapping from Fock states to cat states, a temporal oscillation due to the pump detuning, as well as its characteristic Rabi oscillations and Ramsey fringes. Finally, we perform gate operations as manipulations of the observed quantum interference. Our findings lay the groundwork for further studies on quantum properties of superconducting Kerr parametric oscillators and their use in quantum information technologies.

Suggested Citation

  • Daisuke Iyama & Takahiko Kamiya & Shiori Fujii & Hiroto Mukai & Yu Zhou & Toshiaki Nagase & Akiyoshi Tomonaga & Rui Wang & Jiao-Jiao Xue & Shohei Watabe & Sangil Kwon & Jaw-Shen Tsai, 2024. "Observation and manipulation of quantum interference in a superconducting Kerr parametric oscillator," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-44496-1
    DOI: 10.1038/s41467-023-44496-1
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    References listed on IDEAS

    as
    1. Shruti Puri & Christian Kraglund Andersen & Arne L. Grimsmo & Alexandre Blais, 2017. "Quantum annealing with all-to-all connected nonlinear oscillators," Nature Communications, Nature, vol. 8(1), pages 1-9, August.
    2. Y. Nakamura & Yu. A. Pashkin & J. S. Tsai, 1999. "Coherent control of macroscopic quantum states in a single-Cooper-pair box," Nature, Nature, vol. 398(6730), pages 786-788, April.
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