2-GHz clock quantum key distribution over 260 km of standard telecom fiber

Details 2-GHz clock quantum key distribution over 260 km of standard telecom fiber 2-GHz clock quantum key distribution over 260 km of standard telecom fiber

2012-03-20

arxiv.org/abs/1203.4323v1

Optics Letters, 37, 1008-1010 (2012)

Physics

Quantum Physics

Scientific paper

10.1364/OL.37.001008

We report a demonstration of quantum key distribution (QKD) over a standard telecom fiber exceeding 50 dB in loss and 250 km in length. The differential phase shift QKD protocol was chosen and implemented with 2 GHz system clock rate. By careful optimization of the 1-bit delayed Faraday-Michelson interferometer and the use of the super-conducting single photon detector (SSPD), we achieved a quantum bit error rate below 2% when the fiber length was no more than 205 km, and of 3.45% for the 260 km length fiber with 52.9 dB loss. We also improved the quantum efficiency of SSPD to obtain high key rate for 50 km length.

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