Nonlocal correlations in the star-network configuration
Nonlocal correlations in the star-network configuration
复制标题
DOI：
10.1103/physreva.90.062109
复制
发表时间：
2014-09
影响因子：
2.9
通讯作者：
A. Tavakoli;Paul Skrzypczyk;D. Cavalcanti;A. Ac'in
中科院分区：
文献类型：
--
作者：
A. Tavakoli;Paul Skrzypczyk;D. Cavalcanti;A. Ac'in
双局域性的概念被引入来研究纠缠交换场景中出现的关联，其中一个纠缠交换场景有两个自然可以被认为是独立的源。这一额外的限制导致了比简单地以双局性不平等的形式施加局部性更严格的要求。在这项工作中，我们考虑了双局域性场景的一个自然推广；即，由单个中心方组成的星形网络被n个边缘方包围，每个边方方与中心共享一个独立的源。对于中心部分执行(I)两个二分测量(Ii)单个Bell状态测量的情况，我们推导出在这种情况下所有局部相关性都满足的不等式。我们证明了这些不等式的量子违例，并研究了它们对噪声和损失的稳健性。
The concept of bilocality was introduced to study the correlations which arise in an entanglement-swapping scenario, where one has two sources which can naturally be taken to be independent. This additional constraint leads to stricter requirements than simply imposing locality, in the form of bilocality inequalities. In this work we consider a natural generalization of the bilocality scenario; namely, the star network consisting of a single central party surrounded by n edge parties, each of which shares an independent source with the center. We derive inequalities which are satisfied by all local correlations in this scenario, for the cases when the central party performs (i) two dichotomic measurements (ii) a single Bell-state measurement. We demonstrate quantum violations of these inequalities and study both the robustness to noise and to losses.