Realization of the Einstein-Podolsky-Rosen paradox using momentum- and position-entangled photons from spontaneous parametric down conversion.

@article{Howell2004RealizationOT,
  title={Realization of the Einstein-Podolsky-Rosen paradox using momentum- and position-entangled photons from spontaneous parametric down conversion.},
  author={John C. Howell and Ryan S. Bennink and Sean J. Bentley and Robert W. Boyd},
  journal={Physical review letters},
  year={2004},
  volume={92 21},
  pages={
          210403
        }
}
We report on a momentum-position realization of the EPR paradox using direct detection in the near and far fields of the photons emitted by collinear type-II phase-matched parametric down conversion. Using this approach we achieved a measured two-photon momentum-position variance product of 0.01 variant Planck's over 2pi (2), which dramatically violates the bounds for the EPR and separability criteria. 

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