Spatially entangled four-photon states from a periodically poled potassium-titanyl-phosphate crystal

被引：8
|
作者：
van der Torren, Alexander J. H. [1 ]
Yorulmaz, S. Cigdem [1 ]
Renema, Jelmer J. [1 ]
van Exter, Martin P. [1 ]
de Dood, Michiel J. A. [1 ]
机构：
[1] Huygens Lab, NL-2300 RA Leiden, Netherlands
来源：
PHYSICAL REVIEW A | 2012年 / 85卷 / 04期
关键词：
QUANTUM INFORMATION; INTERFERENCE;
D O I：
10.1103/PhysRevA.85.043837
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Spatial quantum correlations are an important resource for quantum imaging and future quantum technologies based on high-dimensional entanglement. We experimentally explore spatial correlations in four-photon states generated by a highly efficient parametric down-conversion process in a 2 mm long periodically poled KTP crystal. The four-photon states produced in the crystal contain a contribution due to independent double pairs produced via spontaneous pair emission and a highly correlated four-photon state produced by stimulated emission of a second photon pair. We separate this contribution and introduce a joint spatial density for stimulated pair emission. We observe a maximum visibility chi = 0.25 of the four-photon state for a 1.5 nm bandpass filter.
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页数：6
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