# 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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### In order to prevent overlapping of different time bins dispersion has to be minimized using dispersion shifted fiber or compensating fibers (see S

- In order to prevent overlapping of different time bins dispersion has to be minimized using dispersion shifted fiber or compensating fibers (see S