飞秒脉冲泵浦自发参量下转换干涉贝尔态制备
Interferometric Bell-state preparation using femtosecond-pulse-pumped Spontaneous Parametric Down-Conversion
摘要：
本文对利用飞秒脉冲泵浦的自发参量下转换技术制备最大纠缠双光子偏振态（Bell态）进行了理论和实验研究。首先，我们展示了如何在飞秒脉冲泵浦的II型SPDC的固有的可重复性可以通过使用干涉技术，而无需光谱和振幅后选择。然后，我们分析了最近推出的贝尔态准备计划使用I型SPDC。理论上，这两种方法提供了相同的结果，然而，I型SPDC提供了实验上优越的方法制备贝尔态飞秒脉冲泵浦SPDC。这种高度纠缠光子对的脉冲源在量子通信、量子密码学、量子隐形传态等方面是有用的。
英文摘要：
We present theoretical and experimental study of preparing maximally entangled two-photon polarization states, or Bell states, using femtosecond pulse pumped spontaneous parametric down-conversion (SPDC). First, we show how the inherent distinguishability in femtosecond pulse pumped type-II SPDC can be removed by using an interferometric technique without spectral and amplitude post-selection. We then analyze the recently introduced Bell state preparation scheme using type-I SPDC. Theoretically, both methods offer the same results, however, type-I SPDC provides experimentally superior methods of preparing Bell states in femtosecond pulse pumped SPDC. Such a pulsed source of highly entangled photon pairs is useful in quantum communications, quantum cryptography, quantum teleportation, etc.
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