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arXiv quant-ph/0604045quant-ph
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集体测量对贝尔不等式的更好破坏

Better Bell Inequality Violation by Collective Measurements

Yeong-Cherng Liang, Andrew C. Doherty

摘要:

标准的贝尔不等式实验通过对纠缠量子态的单个副本重复进行局部测量来测试对局部实在论的违反。在这里,我们调查的可能性,增加违反贝尔不等式的集体测量。我们表明,非局部性的两体纯纠缠态,量化的最大违反贝尔-克劳泽-霍恩不等式,总是可以增强集体测量,即使没有双方之间的通信。对于混合态,我们还表明,集体测量可以增加违反贝尔不等式,虽然数值证据表明,这种现象并不常见,因为它是纯态。

英文摘要:

The standard Bell inequality experiments test for violation of local realism by repeatedly making local measurements on individual copies of an entangled quantum state. Here we investigate the possibility of increasing the violation of a Bell inequality by making collective measurements. We show that nonlocality of bipartite pure entangled states, quantified by their maximal violation of the Bell-Clauser-Horne inequality, can always be enhanced by collective measurements, even without communication between the parties. For mixed states we also show that collective measurements can increase the violation of Bell inequalities, although numerical evidence suggests that the phenomenon is not common as it is for pure states.

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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