Bright source of spectrally uncorrelated polarization-entangled photons with nearly single-mode emission

Phys Rev Lett. 2010 Dec 17;105(25):253601. doi: 10.1103/PhysRevLett.105.253601. Epub 2010 Dec 13.

Abstract

We present results of a bright polarization-entangled photon source operating at 1552 nm via type-II collinear degenerate spontaneous parametric down-conversion in a periodically poled potassium titanyl phosphate crystal. We report a conservative inferred pair generation rate of 123,000 pairs/s/mW into collection modes. Minimization of spectral and spatial entanglement was achieved by group velocity matching the pump, signal, and idler modes and through properly focusing the pump beam. By utilizing a pair of calcite beam displacers, we are able to overlap photons from adjacent down-conversion processes to obtain polarization-entanglement visibility of 94.7+/-1.1% with accidentals subtracted.