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

MPS-Authors
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Christ,  A.
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Eckstein,  A.
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Mosley,  P. J.
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Silberhorn,  C.
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Christ, A., Eckstein, A., Mosley, P. J., & Silberhorn, C. (2009). Pure single photon generation by type-I PDC with backward-wave amplification. OPTICS EXPRESS, 17(5), 3441-3446. doi:10.1364/OE.17.003441.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6C05-C
Abstract
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 its unfavorable phasematching properties) to produce heralded pure single photons over a broad frequency range. (c) 2009 Optical Society of America