From decay of correlations to locality and stability of the Gibbs state

• URL: http://arxiv.org/abs/2310.09182v2
• Date: Tue, 6 Feb 2024 16:35:32 GMT
• Title: From decay of correlations to locality and stability of the Gibbs state
• Authors: \'Angela Capel, Massimo Moscolari, Stefan Teufel, Tom Wessel
• Abstract summary: We show that whenever a Gibbs state satisfies decay of correlations, then it is stable, in the sense that local perturbations influence the Gibbs state only locally. These implications hold true in any dimension, only require locality of the Hamiltonian and rely on Lieb-Robinson bounds.
• Score: 0.27309692684728604
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: In this paper we show that whenever a Gibbs state satisfies decay of correlations, then it is stable, in the sense that local perturbations influence the Gibbs state only locally, and it is local, namely it satisfies local indistinguishability. These implications hold true in any dimensions, only require locality of the Hamiltonian and rely on Lieb-Robinson bounds. Then, we explicitly apply our results to quantum spin systems in any dimension with short-range interactions at high enough temperature, where decay of correlations is known to hold. Furthermore, our results are applied to Gibbs states of finite one-dimensional spin chains with translation-invariant and exponentially decaying interactions, for which we also show that decay of correlations holds true above a threshold temperature that goes to zero in the limit of finite-range interactions. Our proofs are based on a detailed analysis of the locality properties of the quantum belief propagation for Gibbs states.

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