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Fixes_composing_problem_issue #1563
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Changes made
The problem which is reported is due to depreciation due to removal of
extendmethod.Justification
Found this in release notes
The
QuantumCircuitmethodscombineandextendhave been removed following their deprecation in Qiskit Terra 0.17.0. This was done because these functions were simply less powerful versions ofQuantumCircuit.compose(), which should be used instead.The removal of
extendalso means that the+and+=operators are no longer defined forQuantumCircuit. Instead, you can use the&and&=operators respectively, which useQuantumCircuit.compose().