The concept of bilocality was introduced to study the correlations whicharise in an entanglement swapping scenario, where one has two sources which cannaturally taken to be independent. This additional constraint leads to stricterrequirements than simply imposing locality, in the form of bilocalityinequalities. In this work we consider a natural generalisation of thebilocality scenario, namely the star-network consisting of a single centralparty surrounded by $n$ edge parties, each of which shares an independentsource with the centre. We derive new inequalities which are satisfied by alllocal correlations in this scenario, for the cases when the central partyperforms (i) two dichotomic measurements (ii) a single Bell state measurement.We demonstrate quantum violations of these inequalities and study both therobustness to noise and to losses.
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机译：引入了双局部性的概念来研究纠缠交换场景中的相关性，其中一个具有两个自然可以独立的来源。除了以双局部性不等式的形式简单地施加局部性之外，此附加约束还导致更严格的要求。在这项工作中，我们考虑了自然的双地点情景，即由单个中央党和$ n $边缘党包围的星状网络，每个边缘党与中心共享一个独立资源。对于中央执行（i）两个二分式测量（ii）单个贝尔状态测量的情况，我们得出了在这种情况下所有局部相关性都满足的新不等式。损失。
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