Controlled Bidirectional Quantum Secure Direct Communication

Figure 14

The different percentages of 𝑘_𝑐 in 𝑁 GHZ states corresponding to the error detection rate and the number of detecting GHZ states. (𝑘_𝑐: the number of GHZ states replaced by Charlie’s EPR pairs. 𝑁: the number of GHZ states which are prepared from Charlie).