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Probing the symmetry breaking of a light–matter system by an ancillary qubit

Author

Listed:
  • Shuai-Peng Wang

    (Beijing Computational Science Research Center
    Zhejiang University)

  • Alessandro Ridolfo

    (Università di Catania)

  • Tiefu Li

    (Tsinghua University
    Beijing Academy of Quantum Information Sciences)

  • Salvatore Savasta

    (Università di Messina)

  • Franco Nori

    (Cluster for Pioneering Research, RIKEN
    The University of Michigan
    RIKEN Center for Quantum Computing (RQC))

  • Y. Nakamura

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

  • J. Q. You

    (Zhejiang University)

Abstract

Hybrid quantum systems in the ultrastrong, and even more in the deep-strong, coupling regimes can exhibit exotic physical phenomena and promise new applications in quantum technologies. In these nonperturbative regimes, a qubit–resonator system has an entangled quantum vacuum with a nonzero average photon number in the resonator, where the photons are virtual and cannot be directly detected. The vacuum field, however, is able to induce the symmetry breaking of a dispersively coupled probe qubit. We experimentally observe the parity symmetry breaking of an ancillary Xmon artificial atom induced by the field of a lumped-element superconducting resonator deep-strongly coupled with a flux qubit. This result opens a way to experimentally explore the novel quantum-vacuum effects emerging in the deep-strong coupling regime.

Suggested Citation

  • Shuai-Peng Wang & Alessandro Ridolfo & Tiefu Li & Salvatore Savasta & Franco Nori & Y. Nakamura & J. Q. You, 2023. "Probing the symmetry breaking of a light–matter system by an ancillary qubit," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40097-0
    DOI: 10.1038/s41467-023-40097-0
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    References listed on IDEAS

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