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Opt Express. 2013 Oct 7;21(20):23241-9. doi: 10.1364/OE.21.023241.

Entanglement distribution over 300 km of fiber.

Abstract

We report the distribution of time-bin entangled photon pairs over 300 km of optical fiber. We realized this by using a high-speed and high signal-to-noise ratio entanglement generation/evaluation setup that consists of periodically poled lithium niobate waveguides and superconducting single photon detectors. The observed two-photon interference fringes exhibited a visibility of 84%. We confirmed the violation of Bell's inequality by 2.9 standard deviations.

PMID:
24104238
DOI:
10.1364/OE.21.023241

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