arXiv 2011.147022020-11-30physics.optics

大气turbulence中矢量模的衰减：一个量子启发的分析

Vector mode decay in atmospheric turbulence: a quantum inspired analysis

Isaac Nape, Nikiwe Mashaba, Nokwazi Mphuthi, Sruthy Jayakumar, Shanti Bhattacharya, Andrew Forbes

发表信息：: Phys. Rev. Applied 15, 034030 (2021)
DOI：: 10.1103/PhysRevApplied.15.034030

摘要：

矢量光束是非均匀偏振的光场，其偏振和空间分量之间具有不可分离的量子相关性，并且在各种信道（例如大气，水下和光纤）上的经典和量子通信中具有巨大的前景。在这里，我们表明，通过利用它们的量子样的功能凭借的不可分离性的字段，衰减的偏振和空间分量可以研究在串联。特别是，我们调用通道状态的对偶性的原则表明，任何矢量模式的不可分离性的程度是纯粹由一个最大的不可分离的，我们确认使用轨道角动量（OAM）作为一个例子，拓扑电荷l = 1和l = 10在湍流大气中。结果是，众所周知的圆柱形矢量涡旋光束足以预测通过信道的所有矢量OAM状态的行为，并且发现矢量质量的衰减率随着OAM值的增加而降低，即使OAM中的扩展是相反的，随着OAM而增加。我们的方法提供了一种快速简便的噪声通道探测，同时揭示了量子工具应用于经典光的能力。

英文摘要：

Vector beams are inhomogeneously polarized optical fields with nonseparable, quantum-like correlations between their polarisation and spatial components, and hold tremendous promise for classical and quantum communication across various channels, e.g. the atmosphere, underwater, and in optical fibre. Here we show that by exploiting their quantum-like features by virtue of the nonseparability of the field, the decay of both the polarisation and spatial components can be studied in tandem. In particular, we invoke the principle of channel state duality to show that the degree of nonseparability of any vector mode is purely determined by that of a maximally nonseparable one, which we confirm using orbital angular momentum (OAM) as an example for topological charges of l = 1 and l = 10 in a turbulent atmosphere. A consequence is that the well-known cylindrical vector vortex beams are sufficient to predict the behaviour of all vector OAM states through the channel, and find that the rate of decay in vector quality decreases with increasing OAM value, even though the spread in OAM is opposite, increasing with OAM. Our approach offers a fast and easy probe of noisy channels, while at the same time revealing the power of quantum tools applied to classical light.

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