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arxiv: 0908.4063 · v1 · submitted 2009-08-27 · 🪐 quant-ph

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200km Decoy-state quantum key distribution with photon polarization

Teng-Yun Chen , Jian Wang , Yang Liu , Wen-Qi Cai , Xu Wan , Luo-Kan Chen , Jin-Hong Wang , Shu-Bin Liu
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Hao Liang Lin Yang Cheng-Zhi Peng Zeng-Bing Chen Jian-Wei Pan
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classification 🪐 quant-ph
keywords photonpolarizationratedecoy-statedistributionfinalquantumbits
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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.

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