量子纠缠
自发参量下转换
光子纠缠
光子学
光子
计算机科学
参数统计
概率逻辑
量子光学
物理
量子信息
量子信息科学
量子
量子传感器
量子网络
光电子学
量子力学
数学
人工智能
统计
作者
Claudia Wagenknecht,Che‐Ming Li,Andreas Reingruber,Xiao‐Hui Bao,Alexander Goebel,Yu Ao Chen,Qiang Zhang,Kai Chen,Jian-Wei Pan
出处
期刊:Nature Photonics
[Springer Nature]
日期:2010-05-30
卷期号:4 (8): 549-552
被引量:356
标识
DOI:10.1038/nphoton.2010.123
摘要
The heralded generation of entangled states is a long-standing goal in quantum information processing, because it is indispensable for a number of quantum protocols. Polarization entangled photon pairs are usually generated through spontaneous parametric down-conversion, but the emission is probabilistic. Their applications are generally accompanied by post-selection and destructive photon detection. Here, we report a source of entanglement generated in an event-ready manner by conditioned detection of auxiliary photons. This scheme benefits from the stable and robust properties of spontaneous parametric down-conversion and requires only modest experimental efforts. It is flexible and allows the preparation efficiency to be significantly improved by using beamsplitters with different transmission ratios. We have achieved a fidelity better than 87% and a state preparation efficiency of 45% for the source. This could offer promise in essential photonics-based quantum information tasks, and particularly in enabling optical quantum computing by reducing dramatically the computational overhead.
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