A new design of plug-and-play quantum key distribution with enhanced security
arXiv (Cornell University)(2020)
摘要
Robust, simple, and flexible quantum key distribution (QKD) is vital for realising practical applications of this technique. Contrary to typical phase-coded QKD schemes, the plug-and-play QKD design requires only one arm-length-insensitive interferometer without active feedback, in which the noise is automatically compensated by the two-way structure. However, there are certain possible loopholes in the typical plug-and-play designs, which require consideration and strict monitoring. This study proposes a new design of plug-and-play QKD based on two-way protocol with enhanced security and presents an experimental demonstration of said scheme. The security is analysed under a collective attack scenario assisted by the decoy state method. The scheme was implemented in a 50.4 km commercial fibre without active feedback. The system showed highly robust performance with an ultra-low error rate and maintained an ultra-high visibility of 0.9947+/-0.0002 through significant environmental changes over 24 hours. We analysis the performance of the system and give a brief discussion of the possible loopholes in practical applications.
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关键词
key distribution,quantum,security,plug-and-play
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