Phys. Rev. Lett. 93, 180502 (2004) [4 pages]Distribution of Time-Bin Entangled Qubits over 50 km of Optical FiberReceived 21 April 2004; published 28 October 2004 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.180502
DOI:
10.1103/PhysRevLett.93.180502
PACS:
03.67.Hk, 03.67.Dd, 42.65.Lm, 42.81.–i
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