Detecting entanglement with transport measurement in weakly interacting and fluctuating systems

• URL: http://arxiv.org/abs/2508.02378v1
• Date: Mon, 04 Aug 2025 13:05:44 GMT
• Title: Detecting entanglement with transport measurement in weakly interacting and fluctuating systems
• Authors: Zhenhua Zhu, Gu Zhang, Dong E. Liu,
• Abstract summary: We develop a protocol to measure von Neumann entropy and mutual information in quantum transport systems.<n>The measurement is feasible for systems with boundary interactions and, critically, for bulk-interacting systems subject to a quantum quench of their internal couplings.
• Score: 1.0912498035272808
• License: http://creativecommons.org/licenses/by/4.0/
• 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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