Spatiotemporal correlations in entangled photons generated by spontaneous parametric down conversion

被引：35
作者：
Osorio, Clara I. [1 ]
Valencia, Alejandra [1 ]
Torres, Juan P. [1 ,2 ]
机构：
[1] ICFO Inst Ciencies Foton, Barcelona 08860, Spain
[2] Univ Politecn Cataluna, Dept Signal Theory & Commun, ES-08034 Barcelona, Spain
来源：
NEW JOURNAL OF PHYSICS | 2008年 / 10卷
关键词：
D O I：
10.1088/1367-2630/10/11/113012
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In most configurations aimed at generating entangled photons based on spontaneous parametric down conversion (SPDC), the generated pairs of photons are required to be entangled in only one degree of freedom. Any distinguishing information coming from the other degrees of freedom that characterize the photon should be suppressed to avoid correlations with the degree of freedom of interest. However, this suppression is not always possible. Here, we show how the frequency information available affects the purity of the two-photon state in space, revealing a correlation between the frequency and the space degrees of freedom. This correlation should be taken into account to calculate the total amount of entanglement between the photons.
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页数：11
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