Practical Measurement Angular Errors Analysis for Thermal-State Continuous-Variable Quantum Key Distribution

Thermal-state continuous-variable quantum key distribution (CV-QKD) of direct reconciliation with heterodyne detection can improve the robustness protocols. However, CV-QKD protocols require outlier detection, optical phase shifters are used to achieve orthogonal differentiation modes, but actual suffer from measurement angular errors, resulting in imperfect phase. This kind error degrades security system. In this paper, we analyze causes and its impact on secret rate thermal-state We propose a compensation method compensate for effects give more complete secure analysis under collective attack. The results obtained paper further protocol enhance performance system using method.