Heralded generation of ultrafast single photons in pure quantum states
Heralded generation of ultrafast single photons in pure quantum states
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DOI：
10.1103/physrevlett.100.133601
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发表时间：
2008-04-04
影响因子：
8.6
通讯作者：
Walmsley, Ian A.
中科院分区：
文献类型：
--
作者：
Mosley, Peter J.;Lundeen, Jeff S.;Walmsley, Ian A.
我们给出了从参数下变换源在纯量子态中制备预告单光子的实验演示。结果表明，通过控制光子对发射的模式结构，可以产生可因式分解的光子对，从而消除了多源干涉方案中对光谱滤光片的需要。在两个独立的光谱工程源中产生了难以区分的前驱光子，并且在没有光谱滤光器的情况下观察到了它们之间的Hong-ou-Mandel干涉。测量的能见度为94.4%，为平均光子纯度设定了一个最小界限。
We present an experimental demonstration of heralded single photons prepared in pure quantum states from a parametric down-conversion source. It is shown that, through controlling the modal structure of the photon pair emission, one can generate pairs in factorable states and thence eliminate the need for spectral filters in multiple-source interference schemes. Indistinguishable heralded photons were generated in two independent spectrally engineered sources and Hong-Ou-Mandel interference observed between them without spectral filters. The measured visibility of 94.4% sets a minimum bound on the mean photon purity.