Heralding pure single photons: a comparision between counter-propagating and co-propagating twin photons

@article{Brambilla2016HeraldingPS,
  title={Heralding pure single photons: a comparision between counter-propagating and co-propagating twin photons},
  author={E. Brambilla and Tommaso Corti and Alessandra Gatti},
  journal={Physical Review A},
  year={2016},
  volume={97}
}
We investigate the possibility of generating pure heralded single photons through spontaneous parametric down-conversion comparing the counter-propagating geometry studied in [1] with more conventional co-propagating configurations which enhance the purity of the heralded photon state through the technique of group-velocity matching. We estimate the Schmidt number associated to the temporal modes as a function of the pump pulse duration for three particular configurations, showing how the… 

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