I have a quantum circuit with a number of gates, and some of them are labeled by some letters without showing the details inside. I have known the quantumcircuit.decompose() would help, but it would decompose all the gates. I am wondering whether we can choose only a subset of gates to decompose. How to write the code? Really appreciate it if some examples can be provided.
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You can just pass the gate label to decompose method:
op1 = random_unitary(4)
op2 = random_unitary(4)
op3 = random_unitary(4)
circ = QuantumCircuit(2)
circ.unitary(op1, [0, 1], 'label_1')
circ.unitary(op2, [0, 1], 'label_2')
circ.unitary(op3, [0, 1], 'label_3')
circ.decompose(gates_to_decompose = 'label_2').draw('mpl')
gates_to_decompose can be a list such as ['label_1', 'label_2']
answered Mar 16, 2022 at 16:52
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$\begingroup$ Thank you very much ! I have tried the following code: qc_Oracle1.decompose(gates_to_decompose = 'abc').draw('mpl'), and got TypeError: decompose() got an unexpected keyword argument 'gates_to_decompose'. Does it mean decompose () does not have the 'gates_to_decompose' argument ? $\endgroup$ Mar 17, 2022 at 13:36
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$\begingroup$ Check your Qiskit version.
gates_to_decomposeadded in Terra 0.19 (Qiskit 0.33). $\endgroup$ Mar 17, 2022 at 13:49 -
$\begingroup$ It works, thank you! It is indeed the qiskit version that causes the error. $\endgroup$ Mar 17, 2022 at 14:20