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arXiv quant-ph/0601107quant-ph
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任意设置数的贝尔不等式及其应用

Bell inequality with an arbitrary number of settings and its applications

Koji Nagata, Wieslaw Laskowski, Tomasz Paterek

摘要:

基于Zukowski引入的一个几何论证,导出了一个新的多集贝尔不等式,适用于多方测量的二能级系统.这推广和统一了以前的一些结果。此外,给出了一个违反该不等式的充分必要条件。结果表明,这类不可分状态不承认当地的现实描述时,两个设置不等式相比,扩展。然而,支持Peres的猜想,量子态相对于所有子系统具有正的部分转置并不违反不等式。此外,我们遵循贝尔不等式和通信复杂性问题之间的一般联系,并提出了一个量子协议与不等式,它优于最好的经典协议。

英文摘要:

Based on a geometrical argument introduced by Zukowski, a new multisetting Bell inequality is derived, for the scenario in which many parties make measurements on two-level systems. This generalizes and unifies some previous results. Moreover, a necessary and sufficient condition for the violation of this inequality is presented. It turns out that the class of non-separable states which do not admit local realistic description is extended when compared to the two-setting inequalities. However, supporting the conjecture of Peres, quantum states with positive partial transposes with respect to all subsystems do not violate the inequality. Additionally, we follow a general link between Bell inequalities and communication complexity problems, and present a quantum protocol linked with the inequality, which outperforms the best classical protocol.

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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