Figure 3

(a) secure bit rate with GLLP theory. (b) secure bit rate with backward channel has decoy state. The dashed line shows the performance of the forward channel with Alice transmitting \(\mu _{1}=0.05\). The dotted line shows the performance of the backward channel with Bob transmitting \(\mu_{3}=0.1\). The solid line shows the SQKD secure bit with \(\mu_{1}=0.05\) and \(\mu_{3}=0.1\)