Asymmetric MDI-QKD Performance Enhancement with Post-Processing: A Comprehensive Analysis

In previous work, the MDI-QKD was studied mainly in symmetric scenarios for simplicity. With the development of theory and technology, researchers have paid more attention to the asymmetric MDI-QKD protocol in recent years. To achieve good interference in the Charlie, Lo proposed that the asymmetric MDI-QKD' /cite{15} can improve the performance of MDI-QKD in practical asymmetric structures based on the four-intensity MDI-QKD' /cite{11}. Asymmetric MDI-QKD is more suitable for common QKD networks. However, due to its asymmetric nature, its performance is inferior to that of the original symmetric scheme. Improving the performance of asymmetric MDI-QKD has become an urgent problem that needs to be addressed. Inspired by other post-processing methods such as AD, actively odd parity pairing (AOPP)' /cite{16, 17}, etc., we studied the principles of these methods and found that the post-processing method AD can be successfully applied to the asymmetric MDI-QKD protocol. Compared with the original protocol, the performance of the protocol has been significantly improved, which is another theoretical verification that post-processing methods can improve the performance of QKD protocols.