Bell nonlocality in the turbulent atmosphere
Bell nonlocality in the turbulent atmosphere
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DOI：
10.1103/physreva.94.053801
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发表时间：
2016-08
影响因子：
2.9
通讯作者：
M. Gumberidze;A. Semenov;D. Vasylyev;W. Vogel
中科院分区：
文献类型：
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作者：
M. Gumberidze;A. Semenov;D. Vasylyev;W. Vogel
在共同传播纠缠光子的情况下，湍流大气通道比可比光纤更好地保留了贝尔不等式的违反[A.A.谢梅诺夫和W. Vogel，Phys.Rev.A81，023835（2010）; arXiv：0909.2492]。在这里，我们重新检查这一结果的情况下，对向传播也考虑到这样一个事实，即每个接收器注册所谓的双击事件，这是由暗计数，杂散光，和多光子纠缠对。我们表明，大气链路的优势是可行的，只有在损失的强烈波动的情况下，共同传播的情况。对于对向传播，贝尔不等式的违反可以改善一个额外的后选择程序测试信道的透射率。
Violations of Bell inequalities are better preserved by turbulent atmospheric channels than by comparable optical fibers in the scenario of copropagating entangled photons [A.A. Semenov and W. Vogel, Phys. Rev. A 81, 023835 (2010); arXiv:0909.2492]. Here we reexamine this result for the case of counterpropagation also considering the fact that each receiver registers so-called double-click events, which are caused by dark counts, stray light, and multi-photon entangled pairs. We show that advantages of the atmospheric links are feasible only for the copropagation scenario in the case of strong fluctuations of losses. For counterpropagation, the violations of Bell inequalities can be improved with an additional postselection procedure testing the channel transmittance.