Laurent Schmalen

This paper presents an easy-to-use open-source software library for continuous-variable quantum key distribution (CV-QKD) systems. The library, written in C++, simplifies the crucial task of information reconciliation, ensuring that both communicating parties share the same secret key despite the noise. It offers a comprehensive set of tools, including modules for multidimensional reconciliation, error correction, and data integrity checks. Designed with user-friendliness in mind, the library hides the complexity of error correction, making it accessible even to users without knowledge of error-correcting codes.

With state-of-the-art coherent detection techniques, the two-step CV-QKD receiver calibration introduces inevitable systematic deviations. In this work, we propose an empirical pre-calibration phase that allows to quantify the impact of these deviations on security.