Nonclassicality and Bell nonlocality in atmospheric links
Nonclassicality and Bell nonlocality in atmospheric links
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DOI：
10.1117/12.2319475
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
M. Bohmann;D. Vasylyev;W. Vogel;A. Semenov
中科院分区：
文献类型：
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作者：
M. Bohmann;D. Vasylyev;W. Vogel;A. Semenov
自由空间量子链路具有明显的实际优势，这是基于光纤的光通道无法实现的——建立卫星介导的量子链路，通过难以到达的区域进行通信，以及与移动物体进行通信。我们考虑了大气湍流对正交压缩、纠缠、贝尔非局域性和光计数的非经典统计等特性的影响，这些特性是量子通信的资源。根据给定信道的特性，我们研究了不同技术的效率，这些技术能够在后选择、预选择和自适应方法中保留这些量子特征。此外，我们还证明了在某些通信场景中使用的非经典相关模式的共传播在自由空间链路中具有明显的优势。
Free-space quantum links have clear practical advantages which are unaccessible with fiber-based optical channels — establishing satellite-mediated quantum links, communications through hardly accessible regions, and communications with moving objects. We consider the effect of the atmospheric turbulence on properties such as quadrature squeezing, entanglement, Bell nonlocality, and nonclassical statistics of photocounts, which are resources for quantum communications. Depending on the characteristics of the given channels, we study the efficiency of different techniques, which enable to preserve these quantum features post-, pre-selection, and adaptive methods. Furthermore, we show that copropagation of nonclassically-correlated modes, which is used in some communication scenarios, has clear advantages in free-space links.