Seungho Yoon

Continuous-variable quantum key distribution (CV QKD) is a promising approach for implementing quantum secured communication using coherent detection and standard optical communication components. In this work, we investigate the relationship between the secret key rate and modulation variance in a CV-QKD system through numerical simulation. The simulation is performed by considering system parameters relevant to our experimental setup, allowing us to estimate the expected key rate behavior as a function of modulation variance. In addition, we experimentally verify the corresponding optical power levels generated by the modulation process, providing a practical connection between the theoretical modulation variance and measurable optical power in the actual system.