Fair Efficiency Comparisons of Decoy-State Quantum Key Distribution Protocols

摘要

Taking the schemes based on diff erent for-mulas of secure key rate as examples, we give a fair com-parison between typical protocols under Universal compos-able (UC) security frame. Through analyzing the relation-ship of security parameters in post-processing stage and final secure key rate, we achieve the unified quantification between protocols based on Gottesman-Lo-Lütkenhaus-Preskill (GLLP) formula and the ones under UC security. Based on the above research, the impact of diff erent send-ing lengths and secure parameters on secure key rate is in-vestigated. Besides, we analyze the conditions of fair com-parison, and for the first time we give a fair comparison between the protocols based on GLLP formula and smooth entropy. By typical efficiency comparisons, we summarize the way for improving secure key rate in the light intensity choice and the single bit error rate estimation method.