Figure 5

(a) Adding one decoy state. (b) Adding two decoy states. The dashed red line shows the performance of the forward channel with Alice transmitting \(\mu_{1}=0.36\). The dotted green line shows the performance of the backward channel with Bob transmitting \(\mu _{3}=0.68\). The solid blue line shows the SQKD secure bit with \(\mu _{1}=0.36\) and \(\mu_{3}=0.68\)