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arXiv · 2508.02378

Detecting entanglement with transport measurement in weakly interacting and fluctuating systems

Zhenhua Zhu·Gu Zhang·Dong E. Liu
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Abstract

Measuring entanglement entropy in interacting, multipartite systems remains a significant experimental challenge. We address this challenge by developing a protocol to measure von Neumann entropy (VNE) and mutual information in quantum transport systems with both many-body interactions and multiple subsystems. Our analysis indicates that the vital connection between VNE and two-point correlation functions persists under these realistic conditions. The measurement is shown to be feasible for systems with boundary interactions and, critically, for bulk-interacting systems subject to a quantum quench of their internal couplings. Our work provides a pathway to experimentally quantify entanglement in complex interacting systems and establishes mutual information as an experimentally accessible indicator for system-environment entanglement.

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Zhenhua Zhu, Gu Zhang, Dong E. Liu. 2025-08-04. Detecting entanglement with transport measurement in weakly interacting and fluctuating systems. https://doi.org/10.1103/77cs-7k18

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