Mingshuo Sun

Nowadays, quantum key distribution (QKD) is gradually moving from the laboratory to practical applications. However, imperfections of practical QKD devices inevitably cause side-channel information leakage, and thus hinder its practical implementations. Among them, there is one critical vulnerability that is often neglected, i.e., leakage of electromagnetic field (LEMF). In this work, we carry out investigations on the impact of LEMF by using a phase-coding QKD system as an example, and give corresponding security analysis. Simulation results show that LEMF may cause fatal security issues if it is ignored. Finally, to address this security issue, we provide corresponding solutions.