Phase Transitions without gap closing in monitored quantum mean-field systems
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arXiv
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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866918230840311808 |
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| author | Capizzi, Luca Travaglino, Riccardo |
| author_facet | Capizzi, Luca Travaglino, Riccardo |
| contents | We investigate the monitored dynamics of many-body quantum systems in which projective measurements of extensive operators are alternated with unitary evolution. Focusing on mean-field models characterized by all-to-all interactions, we develop a general framework that captures the thermodynamic limit, where a semiclassical description naturally emerges. Remarkably, we uncover novel stationary states, distinct from the conventional infinite-temperature state, that arise upon taking the infinite-volume limit. Counterintuitively, this phenomenon is not linked to the closing of the Lindbladian gap in that limit. We provide analytical explanation for this unexpected behavior. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_04201 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phase Transitions without gap closing in monitored quantum mean-field systems Capizzi, Luca Travaglino, Riccardo Statistical Mechanics Quantum Physics We investigate the monitored dynamics of many-body quantum systems in which projective measurements of extensive operators are alternated with unitary evolution. Focusing on mean-field models characterized by all-to-all interactions, we develop a general framework that captures the thermodynamic limit, where a semiclassical description naturally emerges. Remarkably, we uncover novel stationary states, distinct from the conventional infinite-temperature state, that arise upon taking the infinite-volume limit. Counterintuitively, this phenomenon is not linked to the closing of the Lindbladian gap in that limit. We provide analytical explanation for this unexpected behavior. |
| title | Phase Transitions without gap closing in monitored quantum mean-field systems |
| topic | Statistical Mechanics Quantum Physics |
| url | https://arxiv.org/abs/2512.04201 |