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arXiv quant-ph/0212117quant-ph
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关于两个三能级系统CH和CHSH不等式的等价性

On the equivalence of the CH and CHSH inequalities for two three-level systems

Jose L. Cereceda

摘要:

本文给出了两个三能级量子系统或量子态的Clauser-Horne(CH)不等式,取代了Kaszlikowski等人[PRA 65,032118(2002)]给出的CH不等式.与后一个CH不等式相反,新的CH不等式被证明等价于Collins等人[PRL 88,040404(2002)]给出的两个qutrits的Clauser-Horne-Shimony-Holt(CHSH)不等式。CH和CHSH不等式都表现出最强的抗噪声性,对于每个位置两个冯诺依曼测量的情况下,非最大纠缠态,首先由Acin等人[PRA 65,052325(2002)]。然而,当考虑到探测器的量子效率不太理想时,这种等价性就不成立了。事实上,对于无噪声的情况下,阈值量子效率以上,没有本地和现实的描述的实验的最佳选择的测量被发现是0.814的CH不等式,而它是等于0.828的CHSH不等式。

英文摘要:

In this paper we show a Clauser-Horne (CH) inequality for two three-level quantum systems or qutrits, alternative to the CH inequality given by Kaszlikowski et al. [PRA 65, 032118 (2002)]. In contrast to this latter CH inequality, the new one is shown to be equivalent to the Clauser-Horne-Shimony-Holt (CHSH) inequality for two qutrits given by Collins et al. [PRL 88, 040404 (2002)]. Both the CH and CHSH inequalities exhibit the strongest resistance to noise for a nonmaximally entangled state for the case of two von Neumann measurements per site, as first shown by Acin et al. [PRA 65, 052325 (2002)]. This equivalence, however, breaks down when one takes into account the less-than-perfect quantum efficiency of detectors. Indeed, for the noiseless case, the threshold quantum efficiency above which there is no local and realistic description of the experiment for the optimal choice of measurements is found to be 0.814 for the CH inequality, whereas it is equal to 0.828 for the CHSH inequality.

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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