Spatial distinguishability of photons produced by parametric down-conversion with a focused pump

@article{Bennink2006SpatialDO,
  title={Spatial distinguishability of photons produced by parametric down-conversion with a focused pump},
  author={R. Bennink and Yun Liu and D. Duncan Earl and W. P. Grice},
  journal={2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference},
  year={2006},
  pages={1-2}
}
Focusing the pump in type-II SPDC not only increases the efficiency of photon collection with single-mode fibers, but also increases the spatial distinguishability of the photons, in some cases reducing the polarization entanglement. 
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