Experimental Demonstration of High-Rate Measurement-Device-Independent Quantum Key Distribution over Asymmetric Channels

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 used two symmetric channels with similar losses. However, the secret key rate is severely limited when diffe...

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Published inPhysical review letters Vol. 122; no. 16; p. 160501
Main Authors Liu, Hui, Wang, Wenyuan, Wei, Kejin, Fang, Xiao-Tian, Li, Li, Liu, Nai-Le, Liang, Hao, Zhang, Si-Jie, Zhang, Weijun, Li, Hao, You, Lixing, Wang, Zhen, Lo, Hoi-Kwong, Chen, Teng-Yun, Xu, Feihu, Pan, Jian-Wei
Format Journal Article
LanguageEnglish
Published United States 26.04.2019
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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 used 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 asymmetric channels. By using the recent 7-intensity optimization approach, we demonstrate>10×higher key rate than the 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.
AbstractList 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 used 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 asymmetric channels. By using the recent 7-intensity optimization approach, we demonstrate>10×higher key rate than the 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.
Author Xu, Feihu
Li, Li
Zhang, Weijun
Lo, Hoi-Kwong
Li, Hao
Wang, Zhen
Wei, Kejin
Pan, Jian-Wei
Chen, Teng-Yun
You, Lixing
Liang, Hao
Liu, Hui
Zhang, Si-Jie
Liu, Nai-Le
Wang, Wenyuan
Fang, Xiao-Tian
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  organization: CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, People's Republic of China
BackLink https://www.ncbi.nlm.nih.gov/pubmed/31075015$$D View this record in MEDLINE/PubMed
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