Non-monotonic evolution of multipartite entanglement under the Unruh effect

• URL: http://arxiv.org/abs/2605.24424v1
• Date: Sat, 23 May 2026 06:39:58 GMT
• Title: Non-monotonic evolution of multipartite entanglement under the Unruh effect
• Abstract summary: We investigate the behavior of tetrapartite entanglement in a four-qubit Dicke state under relativistic motion.<n>We show that the entanglement exhibits a non-monotonic evolution.<n>We find that Dicke states constitute more robust multipartite quantum resources against Unruh-induced decoherence.
• Score: 4.129948253187062
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate the behavior of tetrapartite entanglement in a four-qubit Dicke state under relativistic motion by employing the Unruh-DeWitt detector model, where one detector undergoes uniform acceleration. We show that the entanglement exhibits a non-monotonic evolution: it first decreases and subsequently increases toward a finite value as the acceleration grows. In contrast to the conventional view that the Unruh effect leads to a monotonic degradation of multipartite entanglement, our results demonstrate that it can instead enhance multipartite entanglement within a finite parameter regime. This behavior reveals a dual role of the Unruh effect in multipartite systems. Our findings therefore provide a refined understanding of relativistic multipartite quantum correlations, indicating that Dicke states constitute more robust multipartite quantum resources against Unruh-induced decoherence and may offer advantages for relativistic quantum information processing tasks.

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