Phase-reference intensity attack on continuous-variable quantum key distribution with a real local oscillator

• URL: http://arxiv.org/abs/2111.09542v1
• Date: Thu, 18 Nov 2021 06:41:00 GMT
• Title: Phase-reference intensity attack on continuous-variable quantum key distribution with a real local oscillator
• Authors: Yun Shao, Yang Li, Heng Wang, Yan Pan, Yaodi Pi, Yichen Zhang, Wei Huang, and Bingjie Xu
• Abstract summary: We show that precisely monitoring the intensity of the phase-reference pulse in real-time is an essential countermeasure to prevent the proposed attacks. An intensity-monitoring scheme for the phase-reference pulse is proposed to strengthen the security of the practical LLO CV-QKD system.
• Score: 13.545550481599525
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In practical continuous-variable quantum key distribution system using local local oscillator (LLO CV-QKD), the phase noise related to coherent detection and phase-reference pulse intensity that can be locally calibrated at the receiver side is considered to be trusted noise to improve the performance. However, if the intensity of the phase-reference pulse is not monitored precisely in real-time, a security loophole will be opened for the eavesdropper to launch attacks. To this end, we propose two practical phase-reference pulse intensity attack strategies, where Eve can reduce the trusted phase noise by manipulating the intensity of the phase-reference pulse, thereby hiding her attack on the signal pulse if the total excess noise remains unchanged. The performance of the LLO CV-QKD system under these attacks has been analyzed. We show that precisely monitoring the intensity of the phase-reference pulse in real-time is an essential countermeasure to prevent the proposed attacks. Moreover, an intensity-monitoring scheme for the phase-reference pulse is proposed to strengthen the security of the practical LLO CV-QKD system and make the trusted phase noise model more robust.

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