Focusing on factorability: space-time coupling in the generation of pure heralded single photons
Focusing on factorability: space-time coupling in the generation of pure heralded single photons
复制标题
关注可分解性：纯预示单光子生成中的时空耦合
DOI：
10.1080/09500340802187324
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发表时间：
2009
影响因子：
1.3
通讯作者：
Mosley P
中科院分区：
文献类型：
--
作者：
Mosley P
The interference of single heralded photons from multiple parametric downconversion sources requires photon pairs in factorable states. Typically, these are selected from an ensemble of pairs by narrow filters that remove any exhibiting correlations. In order to eliminate these lossy filters, factorable photon pairs free from any spatio-temporal correlations must be created directly at each source. This requires careful engineering of the group velocity dispersion of the nonlinear crystal in which pair generation takes place. Several schemes have been proposed to do this in the plane-wave regime, but in a realistic experiment one must also take into account the effects of focusing on the two-photon state. Focusing leads to space–time coupling between the pump structure and the downconverted pairs that has the potential to reduce their factorability, but if carefully managed can actually increase it. In this paper, we consider some of the effects of focusing and their consequences for pure single photon generation.
