Physics – Quantum Physics
Scientific paper
2010-09-08
Physical Review Letters, Vol. 105, 253601 (2010)
Physics
Quantum Physics
4 pages, 7 color figures. Revised manuscript includes the following changes: corrected pair generation rate from 44,000/s/mW p
Scientific paper
10.1103/PhysRevLett.105.253601
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.
Bennink Ryan S.
Evans Paul G.
Grice Warren P.
Humble T. S.
Schaake John
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