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arXiv 1102.1438quant-ph
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无环后选择的强量子关联

Stronger Quantum Correlations with Loophole-free Post-selection

Matty J. Hoban, Dan E. Browne

摘要:

量子力学最显著的非经典特征之一是它预测的空间分离测量之间的相关性。在局域隐变量理论中,相关性受到贝尔不等式的约束,但量子相关性违反了这些约束。然而,实验的不完善导致了“漏洞”,即LHV相关不再受贝尔不等式的约束,违反可以描述的LHV理论。例如,通过选择性地检测事件可能会出现漏洞。在这封信中,我们介绍了一个干净的,可操作的图片多方贝尔测试,并表明存在一个非平凡的形式的无漏洞后选择。令人惊讶的是,同样的后选择可以增强量子相关性,并解开非经典相关性和非经典计算之间的联系。

英文摘要:

One of the most striking non-classical features of quantum mechanics is in the correlations it predicts between spatially separated measurements. In local hidden variable theories, correlations are constrained by Bell inequalities, but quantum correlations violate these. However, experimental imperfections lead to "loopholes" whereby LHV correlations are no longer constrained by Bell inequalities, and violations can be described by LHV theories. For example, loopholes can emerge through selective detection of events. In this letter, we introduce a clean, operational picture of multi-party Bell tests, and show that there exists a non-trivial form of loophole-free post-selection. Surprisingly, the same post-selection can enhance quantum correlations, and unlock a connection between non-classical correlations and non-classical computation.

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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