I am trying to represent a quantum circuit schematically with some operators in QISKIT. I know I can create some operator with
Operator() in quantum_info from a circuit circ like
To add the $Q_1$ operator to the circuit I can do
circ.append(Q1, [0, 1])
which adds $Q_1$ operator to the circuit and maps the 0th bit of the circuit to the 0th bit of the $Q_1$ operator and 1st bit of the circuit to the 1st bit of the $Q_1$ operator. The resulting circuit for a 4-qubit circuit circ is
I was wondering how to edit the label of the operator. Right now it's just showing Unitary in the circuit block. I tried to find this in the QISKIT documentation. So far, no luck!