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arXiv:2604.21513

Quantum jump correlations in long-range dissipative spin systems via cluster and cumulant expansions

Giulia Salatino, Anna Delmonte, Zejian Li, Rosario Fazio, Alberto Biella

quant-phcond-mat.stat-mechSubmitted Apr 23, 2026• Announced Apr 24, 2026• 0 citations• Revised May 13, 2026 (v2)
v1 · Apr 23, 2026v2 · May 13, 2026
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Abstract

We characterize nonequilibrium phases in long-range dissipative spin systems through the statistical properties of quantum jump trajectories. While the average dynamics governed by the Lindblad master equation provides access to steady-state expectation values of order parameters, the quantum trajectory framework reveals features encoded in the spatial and temporal correlations of detection events. Focusing on a model exhibiting a paramagnetic-to-ferromagnetic phase transition, we investigate the full counting statistics of quantum jumps using a tilted Lindbladian approach. We combine this with cluster mean-field and cumulant expansion techniques, which allow us to capture, respectively, the short- and long-range structure of jump correlations. In addition, we study the waiting-time distributions of detection events. We show that quantum jump correlations display clear signatures of the underlying phases and reveal distinct dynamical features across the transition. Our results highlight the potential of trajectory-resolved observables as probes of collective behavior in open quantum many-body systems and provide new insights into the role of long-range interactions in shaping nonequilibrium dynamics.

Comments
15 pages, 9 figures

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