I have been experimenting with the swap-gate in Qiskit's Quantum-Composer and I'am confused:
Initialized two qubits with 0, a not-gate on q[0] results in the state 01:
I expect a subsequent swap-gate to result in state 10, but it leaves the state unchanged:
However, if you set the swap-gate first and then the not-gate, you get 10. I would have expected that a swap would have no effect on the qubits initialized with 0:
By the way: If I replace the swap-gate with an equivalent circuit using CNOT gates, the circuit works as expected: 01 becomes 10:
Is there something wrong with the swap-gate?
