Focusing on factorability : Space-time coupling in the generation of pure heralded single photons

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DOIResolve DOI: http://doi.org/10.1080/09500340802187324
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TypeArticle
Journal titleJournal of Modern Optics
Volume56
Issue2-3
Subjectphoton; parametric downconversion; pure state; heralding
AbstractThe interference of single heralded photons from multiple parametric downconversion sources requires photon pairs in factorable states. Typically, these are selected from an ensemble of pairs by narrow filters that remove any exhibiting correlations. In order to eliminate these lossy filters, factorable photon pairs free from any spatiotemporal correlations must be created directly at each source. This requires careful engineering of the group velocity dispersion of the nonlinear crystal in which pair generation takes place. Several schemes have been proposed to do this in the plane-wave regime, but in a realistic experiment one must also take into account the effects of focusing on the two-photon state. Focusing leads to space–time coupling between the pump structure and the downconverted pairs that has the potential to reduce their factorability, but if carefully managed can actually increase it. In this paper, we consider some of the effects of focusing and their consequences for pure single photon generation.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number15743664
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Record identifier2169d5d0-e724-4902-a786-66f9d5e0fac0
Record created2010-06-25
Record modified2016-05-09
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