Figure 8
From: Quantum encryption with quantum permutation pad in IBMQ systems
The encryption circuit for functional currently-realizable implementation of a 2-qubits QPP on IBMQ using Qiskit starts by breaking the randomized plaintext bits into 2-bits chunks. Each such chunks is encrypted separately with a new circuit. We give such circuit for one block in this figure. Note that the qubits in each such circuit are initialized according to the randomized plaintext bits of the corresponding bit block