Abstract

We generate photon pairs at telecom wavelength through a spontaneous four-wave mixing process in a short 10 m of highly nonlinear fiber. We use a counterpropagating scheme to generate a correlated and entangled photon pair. We observe coincidence to accidental-coincidence ratio of $29\pm 3$ at room temperature (300 K) and as high as $130\pm 5$ when the fiber is cooled to liquid-nitrogen temperature (77 K). Two-photon interference with visibility $>98\%$ ($>92\%$) and the violation of Bell’s inequality by $>12$ ($\approx 5$) standard deviation are observed at 77 K (300 K), respectively, without subtracting accidental-coincidence count. We obtain a photon-pair production rate about factor 3(2) higher than a 300 m dispersion-shifted fiber at 300 K (77 K).

© 2012 Optical Society of America

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