Control of Multipartite Entanglement through Anisotropy against Thermal Noise

TL;DR

This paper demonstrates that tuning anisotropy in an XXZ spin chain can enhance the robustness of multipartite entanglement against thermal noise, aiding quantum information stability.

Contribution

It introduces an analytical method showing how anisotropy tuning stabilizes multipartite entanglement in open quantum systems.

Findings

Robustness of entanglement increases at low temperatures with anisotropy tuning.

Analytical results obtained using master equations and Bethe ansatz.

Interaction-induced spectral control stabilizes multipartite entanglement.

Abstract

Preserving multipartite entanglement in open many-body quantum systems is fundamentally limited by unavoidable environmental noise. We study the open-system dynamics of multipartite entanglement in an anisotropic XXZ spin chain interacting with a thermal spin bath, focusing on two states with distinct types of multipartite entanglement: the generalized GHZ and the generalized W state. Using a master-equation approach combined with the Bethe ansatz technique, we show analytically that robustness of multipartite entanglement at low temperatures can be enhanced by suitably tuning the anisotropy of the system. Our results highlight interaction-induced spectral control as a mechanism for stabilizing multipartite entanglement in quantum computing platforms.