Conditional preparation of single photons using parametric downconversion: A recipe for purity

Details Conditional preparation of single photons using parametric downconversion: A recipe for purity Conditional preparation of single photons using parametric downconversion: A recipe for purity

2008-07-09

arxiv.org/abs/0807.1409v1

Physics

Quantum Physics

27 pages, 14 figures, submitted to NJP

Scientific paper

10.1088/1367-2630/10/9/093011

In an experiment reported recently [Phys. Rev. Lett. 100, 133601 (2008)], we demonstrated that, through group velocity matched parametric downconversion, heralded single photons can be generated in pure quantum states without spectral filtering. The technique relies on factorable photon pair production, initially developed theoretically in the strict collinear regime; focusing - required in any experimental implementation - can ruin this factorability. Here we present the numerical model used to design our single photon sources and minimize spectral correlations in the light of such experimental considerations. Furthermore, we show that the results of our model are in good agreement with measurements made on the photon pairs and give a detailed description of the exact requirements for constructing this type of source.

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