Observation of a superradiant phase transition with emergent cat states

• URL: http://arxiv.org/abs/2207.05512v3
• Date: Tue, 12 Sep 2023 03:19:45 GMT
• Title: Observation of a superradiant phase transition with emergent cat states
• Authors: Ri-Hua Zheng, Wen Ning, Ye-Hong Chen, Jia-Hao L\"u, Li-Tuo Shen, Kai Xu, Yu-Ran Zhang, Da Xu, Hekang Li, Yan Xia, Fan Wu, Zhen-Biao Yang, Adam Miranowicz, Neill Lambert, Dongning Zheng, Heng Fan, Franco Nori, and Shi-Biao Zheng
• Abstract summary: Superradiant phase transitions (SPTs) are important for understanding light-matter interactions at the quantum level. We report an experimental demonstration of the SPT featuring the emergence of a highly nonclassical photonic field.
• Score: 18.801683138820948
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Superradiant phase transitions (SPTs) are important for understanding light-matter interactions at the quantum level, and play a central role in criticality-enhanced quantum sensing. So far, SPTs have been observed in driven-dissipative systems, but the emergent light fields did not show any nonclassical characteristic due to the presence of strong dissipation. Here we report an experimental demonstration of the SPT featuring the emergence of a highly nonclassical photonic field, realized with a resonator coupled to a superconducting qubit, implementing the quantum Rabi model. We fully characterize the light-matter state by Wigner matrix tomography. The measured matrix elements exhibit quantum interference intrinsic of a photonic mesoscopic superposition, and reveal light-matter entanglement

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