High purity bright single photon source
High purity bright single photon source
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DOI：
10.1364/oe.15.007940
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发表时间：
2007-06-25
期刊：
影响因子：
3.8
通讯作者：
Polzik, E. S.
中科院分区：
文献类型：
--
作者：
Neergaard-Nielsen, J. S.;Nielsen, B. Melholt;Polzik, E. S.
使用腔增强非简并参量下转换，我们已经建立了一个频率可调的预示单光子源，具有8 MHz的窄带宽，使其与原子量子存储器兼容。光子态是70%纯的单光子，其特征在于通过断层测量和重建的量子态，揭示了一个明显的负维格纳函数。此外，它的光谱亮度接近每MHz带宽1，500光子/秒，使其成为可用的最亮单光子源之一。我们还研究了相关函数的下转换字段使用两个非常不同的检测方法的组合;光子计数和零差测量。(C)2007年美国光学学会
Using cavity-enhanced non-degenerate parametric down-conversion, we have built a frequency tunable source of heralded single photons with a narrow bandwidth of 8 MHz, making it compatible with atomic quantum memories. The photon state is 70% pure single photon as characterized by a tomographic measurement and reconstruction of the quantum state, revealing a clearly negative Wigner function. Furthermore, it has a spectral brightness of similar to 1,500 photons/s per MHz bandwidth, making it one of the brightest single photon sources available. We also investigate the correlation function of the down-converted fields using a combination of two very distinct detection methods; photon counting and homodyne measurement. (C) 2007 Optical Society of America