Guillaume Ricard

Continous-Variable Quantum Key Distribution (CV-QKD) relies on accurate noise calibration at the receiver to ensure the security of quantum communication. Traditional calibration methods often oversimplify noise characteristics, neglecting the impact of local oscillator (LO) noise and the critical role of noise dynamics, which can lead to imprecise Shot Noise Calibration (SNC). Our contributions are threefold: 1) we propose an operational framework for calibration, relying on the notion of stationarity 2) in this framework, we give a method allowing to derive the optimal calibration time 3) leveraging our knowledge of noise dynamics, we introduce a novel SNC method. We demonstrate that our improved calibration techniques offer higher performance and higher tolerance to receiver defects, which can enhance the performance and cost-effectiveness of CV-QKD systems.