Test of Genuine Multipartite Nonlocality,Physical Review Letters

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Test of Genuine Multipartite Nonlocality
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-10-04 , DOI: 10.1103/physrevlett.129.150401
Ya-Li Mao _{1,

2} , Zheng-Da Li ₁ , Sixia Yu ₃ , Jingyun Fan _{1,

2}

Affiliation

While Bell nonlocality of a bipartite system is counterintuitive, multipartite nonlocality in our many-body world turns out to be even more so. Recent theoretical study reveals in a theory-agnostic manner that genuine multipartite nonlocal correlations cannot be explained by any causal theory involving fewer-partite nonclassical resources and global shared randomness. Here, we provide a Bell-type inequality as a test for genuine multipartite nonlocality in network by exploiting a matrix representation of the causal structure of a multipartite system. We further present experimental demonstrations that both four-photon GHZ state and generalized four-photon GHZ state significantly violate the inequality, i.e., the observed four-partite correlations resist explanations involving three-way nonlocal resources subject to local operations and common shared randomness, hence confirming that nature is boundless multipartite nonlocal.

中文翻译：

真正的多方非局域性检验

虽然二部系统的贝尔非定域性是违反直觉的，但在我们的多体世界中，多部非定域性更是如此。最近的理论研究以与理论无关的方式揭示了真正的多部分非局部相关性不能用任何涉及较少部分非经典资源和全局共享随机性的因果理论来解释。在这里，我们通过利用多部分系统的因果结构的矩阵表示来提供贝尔型不等式，作为对网络中真正的多部分非局部性的测试。我们进一步展示了四光子 GHZ 态和广义四光子 GHZ 态都显着违反不等式的实验证明，即

更新日期：2022-10-04

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