基于参量下转换的后选与非后选量子隐形传态
Postselected versus nonpostselected quantum teleportation using parametric down-conversion
摘要：
我们研究了Bouwmeester { \em et al}提出的量子隐形传态的实验实现。[Nature { \bf 390}，575（1997）]以及Braunstein和Kimble [Nature { \bf 394}，841（1998）]建议的对其的调整。这些建议包括采用检测器级联和两个下变频器之一的相对减速。我们发现，从参数下转换光子对之间的重合自动探测这些源的非泊松结构。此外，我们发现，检测器级联的使用是有限的，并且修改下转换效率的相对强度将增加实验的时间到几周的顺序。因此，我们的分析指出了单光子探测器在非后选择型实验中的好处，这种技术目前需要大约$6^{\circ}$ K的操作条件。
英文摘要：
We study the experimental realisation of quantum teleportation as performed by Bouwmeester {\em et al}. [Nature {\bf 390}, 575 (1997)] and the adjustments to it suggested by Braunstein and Kimble [Nature {\bf 394}, 841 (1998)]. These suggestions include the employment of a detector cascade and a relative slow-down of one of the two down-converters. We show that coincidences between photon-pairs from parametric down-conversion automatically probe the non-Poissonian structure of these sources. Furthermore, we find that detector cascading is of limited use, and that modifying the relative strengths of the down-conversion efficiencies will increase the time of the experiment to the order of weeks. Our analysis therefore points to the benefits of single-photon detectors in non-post-selected type experiments, a technology currently requiring roughly $6^{\circ}$K operating conditions.
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