Security bound of continuous-variable measurement-device-independent quantum key distribution with imperfect phase reference calibration
Autor: | Peng Huang, Shiyu Wang, Hong-Xin Ma, Wan-Su Bao, Dongyun Bai, Guihua Zeng, Tao Wang |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
Physics
Security analysis Quantum Physics Noise (signal processing) Calibration (statistics) Gaussian Phase (waves) FOS: Physical sciences Lossy compression Quantum key distribution 01 natural sciences 010305 fluids & plasmas symbols.namesake Control theory 0103 physical sciences symbols Imperfect Quantum Physics (quant-ph) 010306 general physics |
Popis: | Phase reference calibration is a necessary procedure in practical continuous-variable measurement-device-independent quantum key distribution (CV-MDI-QKD) for the need of Bell-State Measurement (BSM). However, the phase reference calibration may become imperfect in practical applications. We explored the practical security of CV-MDI-QKD with imperfect phase reference calibration under realistic conditions of lossy and noisy quantum channel. Specifically, a comprehensive framework is developed to model and characterize the imperfection of practical phase reference calibration operation, which is mainly caused by the non-synchronization of two remote lasers in senders. Security analysis shows that the imperfect phase reference calibration has significant side effects on the performance and security of the CV-MDI-QKD protocol. A tight security bound to excess noise introduced by imperfect phase reference calibration is derived for reverse reconciliation against arbitrary collective attacks in the asymptotic limit, and the tolerance of the CV-MDI-QKD protocol to this excess noise is also obtained. This security analysis framework can eliminate the security hazards caused by imperfect phase reference calibration without changing the existing CV-MDI-QKD system structure. 10 pages, 9 figures |
Databáze: | OpenAIRE |
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