用数字示波器测量矢量模的不可分离性
Measuring the non-separability of vector modes with digital micromirror devices
摘要：
复矢量光场的空间自由度和偏振自由度之间的不可分离性近年来引起了人们的广泛关注。其关键在于它与量子纠缠的显著相似之处，在经典水平上观察到类似量子的效应。至关重要的是，这种并行性使得能够使用量子工具来量化空间和偏振DoF之间的耦合，通常使用偏振相关空间光调制器来实现，这需要将矢量模式分裂成两个正交偏振分量。在这里，我们提出了一种新的方法，依赖于使用数字微镜器件（DMD）的快速，廉价和强大的测量，而偏振无关的性质，使所需的测量的数量减少了25%。我们测试了我们的方法实验上的圆柱矢量模式与任意程度的不可分离性，在各种各样的应用程序中具有很大的相关性。我们的技术提供了一种可靠的方法来实时测量矢量模式的纯度，为新的应用铺平了道路，其中不可分离的程度可以用作光学传感器。
英文摘要：
The non-separability between the spatial and polarisation Degrees of Freedom (DoFs) of complex vector light fields has drawn significant attention in recent time. Key to this are its remarkable similarities with quantum entanglement, with quantum-like effects observed at the classical level. Crucially, this parallelism enables the use of quantum tools to quantify the coupling between the spatial and polarisation DoFs, usually implemented with polarisation-dependent spatial light modulators, which requires the splitting of the vector mode into two orthogonal polarisation components. Here we put forward a novel approach that relies on the use of Digital Micromirror Devices (DMDs) for fast, cheap and robust measurement, while the polarisation-independent nature of DMDs enables a reduction in the number of required measurements by 25\%. We tested our approach experimentally on cylindrical vector modes with arbitrary degrees of non-separability, of great relevance in a wide variety of applications. Our technique provides a reliable way to measure in real time the purity of vector modes, paving the way to novel applications where the degree of non-separability can be used as an optical sensor.
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