Experimental demonstration of high-rate measurement-device-independent quantum key distribution over asymmetric channels
Abstract
Measurement-device-independent quantum key distribution (MDI-QKD) can eliminate all detector side channels and it is practical with current technology. Previous implementations of MDI-QKD all use two symmetric channels with similar losses. However, the secret key rate is severely limited when different channels have different losses. Here we report the results of the first high-rate MDI-QKD experiment over channels. By using the recent 7-intensity optimization approach, we demonstrate 10x higher key rate than previous best-known protocols for MDI-QKD in the situation of large channel asymmetry, and extend the secure transmission distance by more than 20-50 km in standard telecom fiber. The results have moved MDI-QKD towards widespread applications in practical network settings, where the channel losses are asymmetric and user nodes could be dynamically added or deleted.
Keywords
Cite
@article{arxiv.1808.08584,
title = {Experimental demonstration of high-rate measurement-device-independent quantum key distribution over asymmetric channels},
author = {Hui Liu and Wenyuan Wang and Kejin Wei and Xiao-Tian Fang and Li Li and Nai-Le Liu and Hao Liang and Si-Jie Zhang and Weijun Zhang and Hao Li and Lixing You and Zhen Wang and Hoi-Kwong Lo and Teng-Yun Chen and Feihu Xu and Jian-Wei Pan},
journal= {arXiv preprint arXiv:1808.08584},
year = {2019}
}
Comments
20 pages, 4 figures