Optics Letters

Generation of high-purity telecom-band entangled photon pairs in dispersion-shifted fiber

Kim Fook Lee, Jun shuo Chen, Chuang Liang, Xiaoying Li, Paul L. Voss, Prem Kumar

Published May 25, 2006• 107 citations

Abstract

We study the purity of correlated photon pairs generated in a dispersion-shifted fiber at various temperatures. The ratio of coincidence to accidental-coincidence counts greater than 100 can be obtained as the fiber is cooled to liquid-nitrogen temperature (77 K). We then generate polarization-entangled photon pairs by using a compact counterpropagating scheme. Two-photon interference with visibility >98% and Bell's inequality violation by >8 standard deviations of measurement uncertainty are observed at 77 K, without subtracting the accidental-coincidence counts due to background Raman photons.

DOI: 10.1364/ol.31.001905

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