来自随机选择局部测量的非经典相关
Nonclassical correlations from randomly chosen local measurements
摘要：
我们发现，与任何局部因果描述不一致的相关性可以是纠缠量子态测量的一般特征。具体来说，空间上分离的各方使用随机选择的测量基对最大纠缠态进行局部测量，可以以很大的概率产生违反贝尔不等式的非经典相关。对于使用Greenberger-Horne-Zeilinger状态的n个参与者，随着参与者数量的增加，这种违反的概率迅速趋于1。我们还表明，即使使用随机选择的双量子比特纯态和随机选择的测量基，大约10%的时间也会发现违规。在其他应用中，我们的工作提供了一个可行的替代证明贝尔不等式违反没有一个共享的参考系。
英文摘要：
We show that correlations inconsistent with any locally causal description can be a generic feature of measurements on entangled quantum states. Specifically, spatially-separated parties who perform local measurements on a maximally-entangled state using randomly chosen measurement bases can, with significant probability, generate nonclassical correlations that violate a Bell inequality. For n parties using a Greenberger-Horne-Zeilinger state, this probability of violation rapidly tends to unity as the number of parties increases. We also show that, even with both a randomly chosen two-qubit pure state and randomly chosen measurement bases, a violation can be found about 10% of the time. Amongst other applications, our work provides a feasible alternative for the demonstration of Bell inequality violation without a shared reference frame.
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