Coherent Optical Communication Techniques for Experimental Continuous-Variable Quantum Key Distribution

Abstract

This work presents the details of implementing a continuous-variable quantum key distribution (CV-QKD) system using coherent reception. The research investigates factors that influence the secret key rate (SKR) in a practical setting, such as laser phase noise, hardware imperfections, and the considered security model. In addition, the study employs signal processing algorithms typically used in coherent optical communication utilizing homodyne detection. The experiment results demonstrate the proposed system’s feasibility and highlight the importance of considering practical limitations when implementing CV-QKD in real-world applications. Overall, this work contributes to the advancement of quantum communication technology and lays the foundation for CV-QKD field implementation.