We demonstrate the decoy-state quantum key distribution over 200 km with photon polarization through optical fiber, by using super-conducting single photon detector with a repetition rate of 320 Mega Hz and a dark count rate of lower than 1 Hz. Since we have used the polarization coding, the synchronization pulses can be run in a low frequency. The final key rate is 14.1 Hz. The experiment lasts for 3089 seconds with 43555 total final bits.
Cite
@article{arxiv.0908.4063,
title = {200km Decoy-state quantum key distribution with photon polarization},
author = {Teng-Yun Chen and Jian Wang and Yang Liu and Wen-Qi Cai and Xu Wan and Luo-Kan Chen and Jin-Hong Wang and Shu-Bin Liu and Hao Liang and Lin Yang and Cheng-Zhi Peng and Zeng-Bing Chen and Jian-Wei Pan},
journal= {arXiv preprint arXiv:0908.4063},
year = {2012}
}