Department of Physics and Mathematics, University of Eastern Finland, P.O. Box 111, Joensuu FI-80101, Finland.
Opt Lett. 2013 Apr 15;38(8):1221-3. doi: 10.1364/OL.38.001221.
We discuss the properties of fields whose polarization states remain invariant in diffractive devices; in particular, in Young's interferometer. We investigate the conditions for such fields, called pure partially polarized fields, in both the space-time and space-frequency domains and show that the frequency-domain condition is a more general one. We also discuss the relationships of polarization purity and nonquantum entanglement between polarization and spatial (or temporal) correlation.
我们讨论了在衍射器件中（特别是在杨氏干涉仪中）偏振态保持不变的场的特性。我们研究了这种被称为纯部分偏振场的条件，分别在时空域和空间-频率域进行了探讨，并表明频域条件更为普遍。我们还讨论了偏振纯度和偏振与空间（或时间）相关性之间的非量子纠缠之间的关系。
