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arXiv 1108.0752quant-ph
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高维系统的贝尔不等式破坏

On Bell inequality violations with high-dimensional systems

Adetunmise C. Dada, Erika Andersson

摘要:

量子关联导致的贝尔不等式的违反已经引起了量子信息科学和基础物理学的极大兴趣。在本文中,我们解决了一些问题,成为相关的贝尔型测试涉及系统的局部尺寸大于2。对于在这种高维系统的2维子空间内的CHSH-Bell测试,有人建议Tsirelson界限的实验违反表明存在多于2维的纠缠。我们解释说,超越Tsirelson的界限是由于违反公平采样,并可以在一般情况下再现的可分离状态,如果违反公平采样。对于一类推广到d维系统的Bell型不等式,我们考虑在满足公平采样的情况下,需要多大程度的违反才能保证被测态的d维纠缠。我们发现,这可以作为一个实验可行的测试d维纠缠高达相当高的值d。

英文摘要:

Quantum correlations resulting in violations of Bell inequalities have generated a lot of interest in quantum information science and fundamental physics. In this paper, we address some questions that become relevant in Bell-type tests involving systems with local dimension greater than 2. For CHSH-Bell tests within 2-dimensional subspaces of such high-dimensional systems, it has been suggested that experimental violation of Tsirelson's bound indicates that more than 2-dimensional entanglement was present. We explain that the overstepping of Tsirelson's bound is due to violation of fair sampling, and can in general be reproduced by a separable state, if fair sampling is violated. For a class of Bell-type inequalities generalized to d-dimensional systems, we then consider what level of violation is required to guarantee d-dimensional entanglement of the tested state, when fair sampling is satisfied. We find that this can be used as an experimentally feasible test of d-dimensional entanglement for up to quite high values of d.

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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