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arXiv 0908.0267quant-ph
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纠缠验证中的加强贝尔不等式

Strengthened Bell Inequalities for Entanglement Verification

Pavel Lougovski, S. J. van Enk

摘要:

贝尔不等式是用来测试量子力学与局域隐变量模型的,但也可以用来验证纠缠。为了纠缠验证的目的,我们假设量子力学的有效性以及测量的量子描述。在这些假设的帮助下,有可能导出一个加强的贝尔不等式,其违反意味着纠缠。我们推广已知的例子,这样的不平等有关的期望值的贝尔运营商的一个特定的量化措施的纠缠,即负性。此外,我们得到的统计数据表明,违反一个给定的(加强或不)贝尔不等式是一个更罕见的壮举两个量子比特的量子态比它是纠缠。

英文摘要:

Bell inequalities were meant to test quantum mechanics vs local hidden variable models, but can also be used to verify entanglement. For entanglement verification purposes one assumes the validity of quantum mechanics as well as quantum descriptions of one's measurements. With the help of these assumptions it is possible to derive a strengthened Bell inequality whose violation implies entanglement. We generalize known examples of such inequalities by relating the expectation value of the Bell operator to a particular quantitative measure of entanglement, namely the negativity. Moreover, we obtain statistics illustrating the fact that violating a given (strengthened or not) Bell inequality is a much more rare feat for a quantum state of two qubits than it is to be entangled.

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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