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Quantum Thermodynamics

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

arXiv
Authors: Luca Capizzi, Riccardo Travaglino

Year

2025

Paper ID

16228

Status

Preprint

Abstract Read

~2 min

Abstract Words

88

Citations

N/A

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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  • We investigate the monitored dynamics of many-body quantum systems in which projective measurements of extensive operators are alternated with unitary evolution.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2512.04201 [2] arXiv https://arxiv.org/abs/2512.04201 [3] Publisher https://arxiv.org/abs/2512.04201

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