Loophole-free plug-and-play quantum key distribution

• URL: http://arxiv.org/abs/2010.05503v3
• Date: Mon, 4 Jan 2021 10:15:59 GMT
• Title: Loophole-free plug-and-play quantum key distribution
• Authors: Ruoyang Qi, Haoran Zhang, Jiancun Gao, Liuguo Yin and Gui-Lu Long
• Abstract summary: This study proposes a loophole-free plug-and-play QKD scheme with two-way protocol. The scheme was implemented in a 50.4 km commercial fibre without active feedback.
• Score: 13.738171806103884
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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 loophole-free plug-and-play QKD scheme with two-way protocol 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.

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