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arXiv 1503.04649quant-ph
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Clauser-Horne-Shimony-Holt类转向不等式的最佳量子违反

Optimal quantum violation of Clauser-Horne-Shimony-Holt like steering inequality

Arup Roy, Some Sankar Bhattacharya, Amit Mukherjee, Manik Banik

摘要:

我们研究了最近提出的Einstein-Podolsky-Rosen转向不等式[arXiv- 1412.8178(2014)]。类似于贝尔非定域的Clauser-Horne-Shimony-Holt(CHSH)不等式,在最简单的情况下,即,2个缔约方,每个缔约方2个测量,每个测量2个结果,这种新提出的不平等已被证明是必要的和足够的指导。本文利用测量不相容性(非联合可测性)与操纵的等价性,在量子理论中找到了这个不等式的最佳违反量。有趣的是,最优违反量与CHSH不等式的最优量子违反相匹配,即,Cirel'son量。我们进一步研究了在不同的二分量子态下这个不等式的最优破坏。令人惊讶的是,我们发现不同的$2$ -量子比特纯纠缠态的最佳违反量是不同的,这不是所有其他现有的转向不等式的情况。

英文摘要:

We study a recently proposed Einstein-Podolsky-Rosen steering inequality [arXiv- 1412.8178 (2014)]. Analogous to Clauser-Horne-Shimony-Holt (CHSH) inequality for Bell nonlocality, in the simplest scenario, i.e., 2 parties, 2 measurements per party and 2 outcomes per measurement, this newly proposed inequality has been proved to be necessary and sufficient for steering. In this article, using an equivalence between measurement incompatibility (non joint measurability) and steering, we find the optimal violation amount of this inequality in quantum theory. Interestingly, the optimal violation amount matches with optimal quantum violation of CHSH inequality, i.e., Cirel'son quantity. We further study the optimal violation of this inequality for different bipartite quantum states. To our surprise we find that optimal violation amount is different for different $2$-qubit pure entangled states, which is not the case for all other existing steering inequalities.

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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