Year: 2023
Type: article
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.
Source: Physical Review Letters
Institutions: Fuzhou University, RIKEN, RIKEN Center for Quantum Computing, Chinese Academy of Sciences, Institute of Physics, University of Chinese Academy of Sciences, South China University of Technology, State Key Laboratory of Modern Optical Instruments, Zhejiang University, Adam Mickiewicz University in Poznań, University of Michigan
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: Foundational Questions Institute, Asian Office of Aerospace Research and Development, National Natural Science Foundation of China, Nippon Telegraph and Telephone, Narodowe Centrum Nauki, Natural Science Foundation of Beijing Municipality, Fuzhou University, Natural Science Fund for Distinguished Young Scholars of Shandong Province, Japan Science and Technology Agency, Special Project for Research and Development in Key areas of Guangdong Province, Moonshot Research and Development Program
OpenAlex ID: W4386590064