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OPTICS LETTERS
卷 38, 期 1, 页码 73-75出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.38.000073
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- AFRL [FA8750-12-1-0136]
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 +/- 3 at room temperature (300 K) and as high as 130 +/- 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 (approximate to 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). (C) 2012 Optical Society of America
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