Experimental observation of the Yang-Lee quantum criticality in open systems
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866929462267871232 |
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| author | Gao, Huixia Wang, Kunkun Xiao, Lei Nakagawa, Masaya Matsumoto, Norifumi Qu, Dengke Lin, Haiqing Ueda, Masahito Xue, Peng |
| author_facet | Gao, Huixia Wang, Kunkun Xiao, Lei Nakagawa, Masaya Matsumoto, Norifumi Qu, Dengke Lin, Haiqing Ueda, Masahito Xue, Peng |
| contents | The Yang-Lee edge singularity was originally studied from the standpoint of mathematical foundations of phase transitions, and its physical demonstration has been of active interest both theoretically and experimentally. However, the presence of an imaginary magnetic field in the Yang-Lee edge singularity has made it challenging to develop a direct observation of the anomalous scaling with negative scaling dimension associated with this critical phenomenon. We experimentally implement an imaginary magnetic field and demonstrate the Yang-Lee edge singularity through a nonunitary evolution governed by a non-Hermitian Hamiltonian in an open quantum system, where a classical system is mapped to a quantum system via the equivalent canonical partition function. In particular, we directly observe the partition function in our experiment using heralded single photons. The nonunitary quantum criticality is identified with the singularity at an exceptional point. We also demonstrate unconventional scaling laws for the finite-temperature dynamics unique to quantum systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_01706 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Experimental observation of the Yang-Lee quantum criticality in open systems Gao, Huixia Wang, Kunkun Xiao, Lei Nakagawa, Masaya Matsumoto, Norifumi Qu, Dengke Lin, Haiqing Ueda, Masahito Xue, Peng Statistical Mechanics Quantum Physics The Yang-Lee edge singularity was originally studied from the standpoint of mathematical foundations of phase transitions, and its physical demonstration has been of active interest both theoretically and experimentally. However, the presence of an imaginary magnetic field in the Yang-Lee edge singularity has made it challenging to develop a direct observation of the anomalous scaling with negative scaling dimension associated with this critical phenomenon. We experimentally implement an imaginary magnetic field and demonstrate the Yang-Lee edge singularity through a nonunitary evolution governed by a non-Hermitian Hamiltonian in an open quantum system, where a classical system is mapped to a quantum system via the equivalent canonical partition function. In particular, we directly observe the partition function in our experiment using heralded single photons. The nonunitary quantum criticality is identified with the singularity at an exceptional point. We also demonstrate unconventional scaling laws for the finite-temperature dynamics unique to quantum systems. |
| title | Experimental observation of the Yang-Lee quantum criticality in open systems |
| topic | Statistical Mechanics Quantum Physics |
| url | https://arxiv.org/abs/2312.01706 |