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Conference on Lasers and Electro-Optics

Long-distance test of Bell's inequality using polarization-entangled photon pairs in a 1550 nm band

Akio Yoshizawa, Hidemi Tsuchida

Published Jan 1, 2005• 0 citations
Publisher
DOI
10.1109/iqec.2005.1561034

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We report a source of polarization-entangled photon pairs in the 1550-nm telecommunication band, which is based on non-collinear spontaneous parametric down-conversion in a periodically poled lithium niobate crystal pumped by picosecond pulses. This source is realized utilizing a polarization-based Sagnac interferometer employing a type-0 non-collinear quasi-phase-matching configuration. Polarization entanglement is verified through measurement of the polarization-correlation interference fringes with visibility >96% and by testing the experimental violation of the Clauser-Horne-Shimony-Holt (CHSH) form of Bell's inequality. The CHSH-Bell parameter S is found to be 2.72 ± 0.04, with 18 standard deviations from the statistical uncertainty.