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Phys Rev Lett. 2004 Oct 29;93(18):180502. Epub 2004 Oct 28.

Distribution of time-bin entangled qubits over 50 km of optical fiber.

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  • 1Group of Applied Physics-Optique, University of Geneva, CH-1211 Geneva 4, Switzerland.


We report experimental distribution of time-bin entangled qubits over 50 km of optical fibers. Using actively stabilized preparation and measurement devices we demonstrate violation of the Clauser-Horne-Shimony-Holt Bell inequality by more than 15 standard deviations without removing the detector noise. In addition we report a proof-of principle experiment of quantum key distribution over 50 km of optical fibers using entangled photon.

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