Unexpected error of QuantumCircuit.decompose with an instruction named qft #13174
Description
Environment
- Qiskit version: 1.2.1 and main branch
- Python version: 3.12.6
- Operating system: macOS 14.7
What is happening?
If a quantum circuit includes an instruction named qft, decompose raises an error since 1.2.0.
How can we reproduce the issue?
from qiskit import QuantumCircuit
qc = QuantumCircuit(1)
qc2 = QuantumCircuit(1, name="qft")
qc.append(qc2.to_instruction(), qc.qregs[0])
print(qc.decompose())# qiskit 1.1.2
q:
# qiskit 1.2.1 and main branch
Traceback (most recent call last):
File "/Users/ima/tasks/4_2024/qiskit/terra/tmp/qft.py", line 6, in <module>
print(qc.decompose())
^^^^^^^^^^^^^^
File "/Users/ima/envs/qiskit312/lib/python3.12/site-packages/qiskit/circuit/quantumcircuit.py", line 3240, in decompose
dag = HighLevelSynthesis().run(dag)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/ima/envs/qiskit312/lib/python3.12/site-packages/qiskit/transpiler/passes/synthesis/high_level_synthesis.py", line 443, in run
decomposition, modified = self._recursively_handle_op(node.op, qubits)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/ima/envs/qiskit312/lib/python3.12/site-packages/qiskit/transpiler/passes/synthesis/high_level_synthesis.py", line 527, in _recursively_handle_op
decomposition = self._synthesize_op_using_plugins(op, qubits)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/ima/envs/qiskit312/lib/python3.12/site-packages/qiskit/transpiler/passes/synthesis/high_level_synthesis.py", line 625, in _synthesize_op_using_plugins
decomposition = plugin_method.run(
^^^^^^^^^^^^^^^^^^
File "/Users/ima/envs/qiskit312/lib/python3.12/site-packages/qiskit/transpiler/passes/synthesis/high_level_synthesis.py", line 999, in run
raise TranspilerError(
qiskit.transpiler.exceptions.TranspilerError: "The synthesis plugin 'qft.full` only applies to objects of type QFTGate."
What should happen?
No error
Any suggestions?
No response