arXiv 1610.033272016-10-11quant-ph

量子网络中的实验非定域性

Experimental non-locality in a quantum network

Gonzalo Carvacho, Francesco Andreoli, Luca Santodonato, Marco Bentivegna, Rafael Chaves, Fabio Sciarrino

备注：: 7 pages, 4 figures + 13 pages Supplementary Information
发表信息：: Nature Communications 8, 14775 (2017)
DOI：: 10.1038/ncomms14775

摘要：

非定域性不仅是量子理论的基石之一，而且在量子信息处理中起着至关重要的作用。多年来，人们对非定域性进行了一些实验研究。然而，尽管它们具有根本的相关性，但所有以前的实验都没有考虑量子网络中普遍存在的一个关键因素：远距离各方之间的相关性是由几个通常独立的量子态源介导的。在这里，使用光子设置，我们调查的量子网络组成的三个空间上分离的节点，其相关性是由两个独立的源介导的。这种情况允许出现一种新的非局部相关性，我们通过实验证明违反了一个新的贝尔不等式。我们的研究结果提供了第一个实验证明的原则，贝尔定理的网络，一个话题，已引起越来越多的关注，并承诺一个新的路由量子通信协议的推广。

英文摘要：

Non-locality stands nowadays not only as one of the cornerstones of quantum theory, but also plays a crucial role in quantum information processing. Several experimental investigations of nonlocality have been carried out over the years. In spite of their fundamental relevance, however, all previous experiments do not consider a crucial ingredient that is ubiquitous in quantum networks: the fact that correlations between distant parties are mediated by several, typically independent, sources of quantum states. Here, using a photonic setup we investigate a quantum network consisting of three spatially separated nodes whose correlations are mediated by two independent sources. This scenario allows for the emergence of a new kind of non-local correlations that we experimentally witness by violating a novel Bell inequality. Our results provide the first experimental proof-of-principle of generalizations of Bell's theorem for networks, a topic that has attracted growing attention and promises a novel route for quantum communication protocols.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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英文摘要：

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