Continuous operation of a one-way quantum key distribution system over installed telecom fibre.

  title={Continuous operation of a one-way quantum key distribution system over installed telecom fibre.},
  author={Zhiliang Yuan and Andrew J. Shields},
  journal={Optics express},
  volume={13 2},
We demonstrate a robust, compact and automated quantum key distribution system, based upon a one-way Mach-Zender interferometer, which is actively compensated for temporal drifts in the photon phase and polarization. The system gives a superior performance to passive compensation schemes with an average quantum bit error rate of 0.87% and a duty cycle of 99.6% for a continuous quantum key distribution session of 19 hours over a 20.3km installed telecom fibre. The results suggest that actively… 

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