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Gao H, Wang K, Xiao L, Nakagawa M, Matsumoto N, Qu D, Lin H, Ueda M, Xue P. Experimental Observation of the Yang-Lee Quantum Criticality in Open Quantum Systems. PHYSICAL REVIEW LETTERS 2024; 132:176601. [PMID: 38728716 DOI: 10.1103/physrevlett.132.176601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 02/25/2024] [Accepted: 03/26/2024] [Indexed: 05/12/2024]
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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Affiliation(s)
- Huixia Gao
- Beijing Computational Science Research Center, Beijing 100084, China
- School of Physics, Southeast University, Nanjing 211189, China
| | - Kunkun Wang
- School of Physics and Optoelectronic Engineering, Anhui University, Hefei 230601, China
| | - Lei Xiao
- School of Physics, Southeast University, Nanjing 211189, China
| | - Masaya Nakagawa
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Norifumi Matsumoto
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Dengke Qu
- Beijing Computational Science Research Center, Beijing 100084, China
| | - Haiqing Lin
- School of Physics, Zhejiang University, Hangzhou 310030, China
| | - Masahito Ueda
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Institute for Physics of Intelligence, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - Peng Xue
- Beijing Computational Science Research Center, Beijing 100084, China
- School of Physics, Southeast University, Nanjing 211189, China
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