Experimental Demonstration of High-Rate Measurement-Device-Independent Quantum Key Distribution over Asymmetric Channels
| Autor: | Kejin Wei, Hao Liang, Hui Liu, Lixing You, X. Fang, Hoi-Kwong Lo, Hao Li, Wei-Jun Zhang, Si-Jie Zhang, Teng-Yun Chen, Jian-Wei Pan, Wenyuan Wang, Zhen Wang, Feihu Xu, Li Li, Nai-Le Liu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
High rate
Physics Quantum Physics Detector General Physics and Astronomy FOS: Physical sciences Quantum key distribution Topology 01 natural sciences 3. Good health Measurement device 0103 physical sciences Key (cryptography) 010306 general physics Quantum Physics (quant-ph) Secure transmission Channel asymmetry Communication channel |
| Zdroj: | Physical review letters. 122(16) |
| ISSN: | 1079-7114 |
| Popis: | 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 $asymmetric$ 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. 20 pages, 4 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|