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

@article{Marcikic2004DistributionOT,
  title={Distribution of time-bin entangled qubits over 50 km of optical fiber.},
  author={Ivan Marcikic and Hugues de Riedmatten and Wolfgang Tittel and Hugo Zbinden and Matthieu Legre and Nicolas Gisin},
  journal={Physical review letters},
  year={2004},
  volume={93 18},
  pages={
          180502
        }
}
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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