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arXiv quant-ph/0407234quant-ph
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随机光散射中熵-退偏振关系的物理界限

Physical Bounds to the Entropy-Depolarization Relation in Random Light Scattering

A. Aiello, J. P. Woerdman

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4 pages, 2 figures
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摘要：

我们提出了一个理论研究的多模光的散射的光学随机介质，使用Mueller-Stokes形式主义，允许编码的所有偏振特性的散射介质中的一个真正的$4 \times 4$矩阵。从该矩阵中可以提取两个相关参数：散射介质的去偏振功率$D_M$和偏振熵$E_M$。通过研究$E_M$和$D_M$之间的关系，我们发现{ \em all}散射介质必须满足一些{ \em universal}约束。这些限制适用于经典和量子散射过程。这里得到的结果可能是特别相关的量子通信应用，其中去极化是与退相干同义。

英文摘要：

We present a theoretical study of multi-mode scattering of light by optically random media, using the Mueller-Stokes formalism which permits to encode all the polarization properties of the scattering medium in a real $4 \times 4$ matrix. From this matrix two relevant parameters can be extracted: the depolarizing power $D_M$ and the polarization entropy $E_M$ of the scattering medium. By studying the relation between $E_M$ and $D_M$, we find that {\em all} scattering media must satisfy some {\em universal} constraints. These constraints apply to both classical and quantum scattering processes. The results obtained here may be especially relevant for quantum communication applications, where depolarization is synonymous with decoherence.

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