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arXiv · 2605.24424

Non-monotonic evolution of multipartite entanglement under the Unruh effect

Shu-Min Wu·Si-Han Shang·Si-Yu Liu·Rui-Yang Xu·Qianqian Liu·Xiao-Li Huang
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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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Shu-Min Wu, Si-Han Shang, Si-Yu Liu, Rui-Yang Xu, Qianqian Liu, Xiao-Li Huang. 2026-09-03. Non-monotonic evolution of multipartite entanglement under the Unruh effect. https://doi.org/10.1016/j.physletb.2026.140852

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