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, Hao Liang, Lin Yang, Cheng-Zhi Peng, Zeng-Bing, Chen, Jian-Wei Pan
TL;DR
This paper reports a successful 200 km decoy-state quantum key distribution experiment using photon polarization, superconducting detectors, and low dark counts, achieving a key rate of 14.1 Hz over a long fiber link.
Contribution
The study demonstrates a long-distance quantum key distribution with high-speed superconducting detectors and polarization coding, improving practical secure communication.
Findings
Achieved 200 km quantum key distribution with polarization coding.
Final key rate of 14.1 Hz over 3089 seconds.
Used superconducting detectors with low dark counts.
Abstract
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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