Statistical distribution of quantum correlation induced by multiple scattering in the disordered medium
Statistical distribution of quantum correlation induced by multiple scattering in the disordered medium
复制标题
无序介质中多重散射引起的量子关联的统计分布
DOI：
10.1016/j.optcom.2019.04.065
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发表时间：
2019-09-01
影响因子：
2.4
通讯作者：
Li, Mo
中科院分区：
文献类型：
--
作者：
Li, Dong;Yao, Yao;Li, Mo
对于无序介质中散射模之间的量子关联，以前的工作主要集中在输入为非叠加态的情况下，例如Fock态的产物（Ott et al.（2010））。一个自然出现的问题是叠加如何影响量子关联。在此基础上，对Fock态的叠加态和乘积态进行了比较。研究发现，对于Fock态的叠加态和相应的乘积态（非高斯态），它们的平均量子关联几乎相同，但它们的量子关联的分布可能不同。因此，叠加态可能会影响量子关联的分布。此外，为了考察高斯态对量子关联的影响，我们还比较了典型的高斯态和非高斯态（Fock态的叠加态和乘积态）。研究发现，非高斯态输入可能导致正或负的量子相关，具体取决于输入模式的数量和每个模式中的光子数量，而高斯态输入总是导致非负的量子相关。此外，研究表明，随着无序强度的增加，多模态输入（多模相干态输入除外）的量子关联的平均强度增加。这些结果对于控制和调节量子化光在无序介质中传播后散射模的量子特性具有重要意义。
For the quantum correlations between scattered modes in the disordered media, the previous works focus mainly on the cases where the inputs are non-superposed states, for instance, products of Fock states (Ott et al. (2010)). A natural question that arises is how the superpositions affect the quantum correlations. Following this trail, the comparison between superpositions and products of Fock states is performed. It is found an interesting phenomenon that for the superposition and the corresponding product of Fock state (non-Gaussian states), their averaged quantum correlations are nearly same, whereas the distributions of their quantum correlations might be different. Therefore, superpositions may affect the distributions of the quantum correlations. In addition, to examine how the Gaussian states affect the quantum correlations, we compare the typical Gaussian states with the non-Gaussian states (superpositions and products of Fock states). It is discovered that the non-Gaussian-state input could result in the quantum correlation that is either positive or negative, depending on the number of the input modes and the number of the photons in each mode, whereas the Gaussian-state input always leads to the non-negative quantum correlation. Besides, it is demonstrated that with the increase of the disorder strength, the mean strength of the quantum correlation increases for multi-mode-state inputs (except for multi-mode-coherent-state inputs). These results may be useful to control and adjust the quantum properties of scattered modes after the quantized lights propagating through the disordered medium.