Non-monotonic evolution of multipartite entanglement under the Unruh effect

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.

arXiv:2605.24424 [gr-qc]

(or arXiv:2605.24424v2 [gr-qc] for this version)

https://doi.org/10.48550/arXiv.2605.24424 Focus to learn more arXiv-issued DOI via DataCite

Phys. Lett. B 880 (2026) 140852

https://doi.org/10.1016/j.physletb.2026.140852 Focus to learn more DOI(s) linking to related resources

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