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Experimental Observation of the Yang-Lee Quantum Criticality in Open Quantum Systems
Huixia Gao1,2, Kunkun Wang3, Lei Xiao2
1Beijing Computational Science Research Center, Beijing 100084, China.
Abstract:
The Yang-Lee edge singularity was originally studied from the standpoint of mathematical foundations of phase transitions. However, direct observation of anomalous scaling with the negative scaling dimension has remained elusive due to an imaginary magnetic field required for the nonunitary criticality. We experimentally implement an imaginary magnetic field with an open quantum system of heralded single photons, directly measure the partition function, and demonstrate the Yang-Lee edge singularity via the quantum-classical correspondence. We also demonstrate unconventional scaling laws for finite-temperature quantum dynamics.
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