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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

Q1=quantum_info.Operator(circ)

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

enter image description here

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!

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One way to do that is to use QuantumCircuit.unitary method as follows

circ.unitary(Q1, [0, 1], 'Custom Label')

enter image description here

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  • $\begingroup$ This is exactly what I needed, thank you. So it seems the operator method does not have similar flexibility then, we need to resort to the Unitary method. $\endgroup$
    – Anyon
    Jan 18, 2022 at 22:15

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