Phase Transitions without gap closing in monitored quantum mean-field systems

• URL: http://arxiv.org/abs/2512.04201v1
• Date: Wed, 03 Dec 2025 19:17:48 GMT
• Title: Phase Transitions without gap closing in monitored quantum mean-field systems
• Authors: Luca Capizzi, Riccardo Travaglino,
• Abstract summary: We investigate the monitored dynamics of many-body quantum systems in which projective measurements of extensive operators are alternated with unitary evolution.<n>We uncover novel stationary states, distinct from the conventional infinite-temperature state, that arise upon taking the infinite-volume limit.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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