Experimental distillation of tripartite quantum steering
Qian-Xi ZhangXiao-Xu FangHe Lu
Qian-Xi ZhangXiao-Xu FangHe Lu
Nov 2023
0被引用
0笔记
摘要原文
Multipartite Einstein-Podolsky-Rosen (EPR) steering admits multipartite entanglement in the presence of uncharacterized verifiers, enabling practical applications in semi-device-independent protocols. Such applications generally require stronger steerability, while the unavoidable noise weakens steerability and consequently degrades the performance of quantum information processing. Here, we propose and demonstrate the optimal local filter operation to distill genuine tripartite EPR steering from two copies of weakly steerable assemblages in the context of two semi-device-independent cases -- one-sided device-independent scenario and two-sided device-independent scenario -- on three-qubit generalized Greenberger-Horne-Zeilinger states. The advance of the optimal local filter is confirmed by the distilled assemblage in terms of higher assemblage fidelity with perfectly genuine tripartite steerable assemblages, as well as the greater violation of the inequality to witness genuine tripartite steerable assemblages. Our results benefit the distillation of multipartite EPR steering in practice, where the number of copies of initial assemblages is generally finite.
