Experimental violation of a cluster state bell inequality.
Experimental violation of a cluster state bell inequality.
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DOI：
10.1103/physrevlett.95.020403
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发表时间：
2005-07
影响因子：
8.6
通讯作者：
P. Walther;M. Aspelmeyer;K. Resch;A. Zeilinger
中科院分区：
文献类型：
--
作者：
P. Walther;M. Aspelmeyer;K. Resch;A. Zeilinger
团簇态是一种新型的多比特纠缠态，具有非常适合量子计算的纠缠特性。在目前的工作中，我们的实验证明，在一个四量子比特的线性集群状态的相关性不能描述的本地现实主义。这种探索基于最近导出的Bell型不等式[V. Scarani等人，Phys.Rev.A71，042325（2005）]，其通过使用三粒子和四粒子相关性的组合而被定制为最大程度地被团簇态违反，但根本不被GHZ态违反。我们观察到一个集群状态贝尔参数为2.59+/-0.08，这是超过7西格玛大于阈值2由本地现实主义。
Cluster states are a new type of multiqubit entangled states with entanglement properties exceptionally well suited for quantum computation. In the present work, we experimentally demonstrate that correlations in a four-qubit linear cluster state cannot be described by local realism. This exploration is based on a recently derived Bell-type inequality [V. Scarani et al., Phys. Rev. A 71, 042325 (2005)] which is tailored, by using a combination of three- and four-particle correlations, to be maximally violated by cluster states but not violated at all by GHZ states. We observe a cluster-state Bell parameter of 2.59+/-0.08, which is more than 7sigma larger than the threshold of 2 imposed by local realism.