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

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

2009-01-07

arxiv.org/abs/0901.0873v2

Opt. Express 17, 3441-3446 (2009)

Physics

Quantum Physics

8 pages, 3 figures, minor text changes and reformatting

Scientific paper

10.1364/OE.17.003441

We explore a promising method of generating pure heralded single photons. Our approach is based on parametric downconversion 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 their unfavorable phasematching properties) to herald pure single photons over a broad frequency range.

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