预示着纯单光子的到来：对传与同传双光子的比较
Heralding pure single photons: a comparision between counter-propagating and co-propagating twin photons
摘要：
我们研究了通过自发参量下转换产生纯预示单光子的可能性，将[1]中研究的反向传播几何结构与更传统的共同传播结构进行比较，后者通过群速度匹配技术提高了预示光子态的纯度。我们估计施密特数的时间模式作为一个函数的泵脉冲持续时间为三个特定的配置，显示如何不同的相位匹配条件的影响程度的可分离性，可以实现。
英文摘要：
We investigate the possibility of generating pure heralded single photons through spontaneous parametric down-conversion comparing the counter-propagating geometry studied in [1] with more conventional co-propagating configurations which enhance the purity of the heralded photon state through the technique of group-velocity matching. We estimate the Schmidt number associated to the temporal modes as a function of the pump pulse duration for three particular configurations, showing how the different phase-matching conditions influences the degree of separability that can be achieved.
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