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- Title
Probing the symmetry breaking of a light–matter system by an ancillary qubit.
- Authors
Wang, Shuai-Peng; Ridolfo, Alessandro; Li, Tiefu; Savasta, Salvatore; Nori, Franco; Nakamura, Y.; You, J. Q.
- 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. Hybrid quantum systems, such as superconducting qubits interacting with microwave photons in resonators, offer a rich platform for exploring fundamental physics. Wang et al. observe parity symmetry breaking in a probe qubit dispersively coupled to a resonator in the deep-strong coupling regime.
- Subjects
SUPERCONDUCTING resonators; PHOTON counting; SYMMETRY breaking; PHENOMENOLOGICAL theory (Physics); RESONATORS; SUPERCONDUCTING quantum interference devices; QUBITS
- Publication
Nature Communications, 2023, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-40097-0