An LLO-CV-QKD blind phase compensation method, device, equipment and medium
By applying the natural logarithmic transformation of the quantum signal at the receiving end and using a Kalman filter model, the problem of unstable phase compensation in existing technologies is solved, achieving high-precision phase compensation under low signal-to-noise ratio and long-distance transmission, thereby improving the system's stability and secure transmission performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUIZHOU UNIV
- Filing Date
- 2026-04-14
- Publication Date
- 2026-07-17
AI Technical Summary
Existing local oscillator continuous variable quantum key distribution systems struggle to simultaneously achieve accurate symbol phase ambiguity removal, phase drift separation, and random noise separation in scenarios with low signal-to-noise ratios and long-distance transmission, resulting in limited blind phase compensation stability and system secure transmission performance.
By sampling and performing natural logarithmic transformation on the quantum signal detected by heterodyne detection at the receiver, the amplitude component and the phase component are separated. Combined with the power operation and block average smoothing of the discrete modulation protocol, the phase noise is estimated and compensated using the Kalman filter model, thus achieving phase compensation under pilotless conditions.
It improves phase compensation accuracy and noise immunity, enhances system stability and secure transmission performance, increases the maximum secure transmission distance, and is suitable for protocols such as 4-PSK, 8-PSK, 16-APSK, and 32-APSK.
Smart Images
Figure CN122419628A_ABST