Statistical fluctuation analysis for decoy-state quantum secure direct communication

초록

In quantum secure direct communication (QSDC), messages are transmitted directly through quantum channels. The decoy state scheme has been widely studied to detect eavesdroppers and improve the secrecy capacity. However, the secret key rate becomes relatively low in this scheme because of the finite-size effect. In this study, the statistical fluctuation analyses of a four-intensity decoy-state QSDC system were performed, and a numerical simulation was conducted in an actual experimental environment. The simulation results were compared, and the parameters optimized using the Gaussian analysis and the Chernoff bound were presented.

키워드