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Opt Express. 2009 Mar 2;17(5):3441-6.

Pure single photon generation by type-I PDC with backward-wave amplification.

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Max-Planck Institute for the Science of Light G√ľnther Scharowsky-Str.1 / Bau 24, 91054 Erlangen, Germany.


We explore a promising method of generating pure heralded single photons. Our approach is based on parametric down-conversion in a periodically-poled waveguide. However, unlike conventional downconversion sources, the photon pairs are counter-propagating: one travels with the pump beam in the forward direction while the other is backpropagating towards the laser source. Our calculations reveal that these downconverted two-photon states carry minimal spectral correlations within each photon-pair. This approach offers the possibility to employ a new range of downconversion processes and materials like PPLN (previously considered unsuitable due to its unfavorable phasematching properties) to produce heralded pure single photons over a broad frequency range.


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