/// <summary>
/// Adds the given swap to the physical circuit, according to
/// the architecture. And adjusts the mapping accordingly.
/// </summary>
/// <param name="q1"> The first qubit in the swap. </param>
/// <param name="q2"> The second qubit in the swap. </param>
protected void AddSwapToCircuit(int q1, int q2)
{
Swap swap = new Swap(q1, q2);
Architecture.AddSwapGates(PhysicalCircuit, swap);
Mapping.Swap(q1, q2);
}