Year: 2026
Type: preprint
Abstract: In open quantum systems with strong symmetries, the global rate function is typically non-convex and thus cannot be directly computed from the global scaled cumulant generating function (SCGF) via the Gartner-Ellis theorem. To overcome this limitation, we develop a framework that applies the theorem locally within each symmetry sector: local rate functions are computed for each sector, and the global rate function is subsequently reconstructed as the minimum envelope of these local functions. We illustrate our method using an exactly solvable model and an open Heisenberg chain with XXX interactions. For the latter system with continuous non-Abelian symmetries, our approach reveals sector-dependent fluctuations ranging from Poissonian to super-Poissonian statistics, together with emergent intermittency, demonstrating the broad applicability of our framework.
Source: arXiv (Cornell University)
Authors: Gu, Jiayi, Wang, Hailong, Su, Shanhe, Liu, Fei
Institutions: Nanjing Normal University, Beihang University, Xiamen University
Language: English
Subfield: Statistical and Nonlinear Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G815563024, G929059028
OpenAlex ID: W7160649979