2018/08/31 by Hui Liu, Wenyuan Wang, Kejin Wei +17 · 3 citations
Computer Science · Physics and Astronomy · #Asymmetry #Channel (broadcasting) #Computer network #Computer science #Computer security #Detector #Key (lock) #Key generation #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum channel #Quantum cryptography #Quantum information #Quantum key distribution #Quantum mechanics #Quantum optics and atomic interactions #Telecommunications #Transmission (telecommunications) #quant-ph
paper · pdf · doi:10.1103/physrevlett.122.160501
published as Phys. Rev. Lett. 122, 160501 (2019) · 20 pages, 4 figures
openalex publication_date 2019/04/26 · arxiv created 2019/04/28 · arxiv updated 2019/04/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.