Average entanglement entropy of a small subsystem in a constrained pure Gaussian state ensemble

• URL: http://arxiv.org/abs/2505.03696v1
• Date: Tue, 06 May 2025 17:03:29 GMT
• Title: Average entanglement entropy of a small subsystem in a constrained pure Gaussian state ensemble
• Authors: Erik Aurell, Lucas Hackl, Mario Kieburg,
• Abstract summary: We consider ensembles of pure Gaussian states parametrized by single-mode marginals and specific mode-mode correlations.<n>We show that the average entanglement entropy of a small subsystem is the same as the von Neumann entropy of a mixed Gaussian state with the same marginals, but no correlations.
• Score: 0.43695508295565777
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: We consider ensembles of pure Gaussian states parametrized by single-mode marginals and (optionally) specific mode-mode correlations. Such ensembles provide a model for the final states when isolated quantum systems thermalize, as they can reproduce thermal properties locally, while being globally pure. By an analysis using real replicas and the coherent state representation of Gaussian states we show that the average entanglement entropy of a small subsystem is the same as the von Neumann entropy of a mixed Gaussian state with the same marginals, but no correlations. Finally, we discuss how these ensembles provide a model for Hawking radiation assuming unitary evolution, and discuss some of their properties in relations to the Page curve of Hawking radiation.

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