Related papers: Probing the symmetry breaking of a light--matter system by an ancillary qubit

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

URL: http://arxiv.org/abs/2209.05747v2
Date: Fri, 21 Jul 2023 05:05:28 GMT
Title: Probing the symmetry breaking of a light--matter system by an ancillary qubit
Authors: Shuai-Peng Wang, Alessandro Ridolfo, Tiefu Li, Salvatore Savasta, Franco Nori, Y. Nakamura, and J. Q. You
Abstract summary: Hybrid quantum systems in the ultrastrong, and even more in the deep-strong, coupling regimes can exhibit exotic physical phenomena. We experimentally observe the parity symmetry breaking of an ancillary Xmon artificial atom induced by the field of a lumped-element superconducting resonator. This result opens a way to experimentally explore the novel quantum-vacuum effects emerging in the deep-strong coupling regime.
Score: 50.591267188664666
License: http://creativecommons.org/licenses/by/4.0/
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.

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