Bright Source of Spectrally Uncorrelated Polarization-Entangled Photons with Nearly Single-Mode Emission

P. G. Evans, R. S. Bennink, W. P. Grice, T. S. Humble, and J. Schaake

Phys. Rev. Lett. 105, 253601 – Published 13 December 2010

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.

Received 8 September 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.253601

Authors & Affiliations

P. G. Evans^*, R. S. Bennink, W. P. Grice, and T. S. Humble

Center for Quantum Information Science, Computing and Computational Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

J. Schaake

Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA

^*evanspg@ornl.gov

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Vol. 105, Iss. 25 — 17 December 2010

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