4. Simulation and execution

4.1 Quantum simulator

Several quantum simulators are available on the Internet. We are interested in IBM's quantum composer .

After creating an account, the interface shown in figure 23 is accessed. It features a palette of components, top left: the classical quantum gates. The user composes his quantum circuit by dragging and dropping the gates onto the central part. Here, the circuit comprises two lines, corresponding to two qubits (