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Superradiant phase transitions (SPTs) are important for understandinglight-matter interactions at the quantum level, and play a central role incriticality-enhanced quantum sensing. So far, SPTs have been observed indriven-dissipative systems, but the emergent light fields did not show anynonclassical characteristic due to the presence of strong dissipation. Here wereport an experimental demonstration of the SPT featuring the emergence of ahighly nonclassical photonic field, realized with a resonator coupled to asuperconducting qubit, implementing the quantum Rabi model. We fullycharacterize the light-matter state by Wigner matrix tomography. The measuredmatrix elements exhibit quantum interference intrinsic of a photonic mesoscopicsuperposition, and reveal light-matter entanglement

Observation of a superradiant phase transition with emergent cat states