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arXiv 1710.02445quant-ph
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协方差贝尔不等式

Covariance Bell inequalities

Victor Pozsgay, Flavien Hirsch, Cyril Branciard, Nicolas Brunner

摘要:

我们引入了基于协方差的贝尔不等式,协方差是最常见的相关性度量之一。明确的例子进行了讨论,违反量子理论证明。这些协方差贝尔不等式的一个重要特征是它们的非线性;这对它们的局部界的推导有重要的影响,而确定性局部相关性是达不到的。对于我们最简单的不等式,我们推导出局部关联和量子关联的解析紧界。协方差贝尔不等式的一个有趣的应用是,它们可以充当“共享随机性见证”:具体地说,贝尔表达式的值给出了局部模型中共享随机变量的维数和熵的与设备无关的下界。

英文摘要:

We introduce Bell inequalities based on covariance, one of the most common measures of correlation. Explicit examples are discussed, and violations in quantum theory are demonstrated. A crucial feature of these covariance Bell inequalities is their nonlinearity; this has nontrivial consequences for the derivation of their local bound, which is not reached by deterministic local correlations. For our simplest inequality, we derive analytically tight bounds for both local and quantum correlations. An interesting application of covariance Bell inequalities is that they can act as "shared randomness witnesses": specifically, the value of the Bell expression gives device-independent lower bounds on both the dimension and the entropy of the shared random variable in a local model.

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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