mirror of https://github.com/Qiskit/qiskit.git
20 lines
980 B
YAML
20 lines
980 B
YAML
---
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fixes:
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Fixed an issue where generating QASM output with the
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:meth:`~qiskit.circuit.QuantumCircuit.qasm` method for a
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:class:`~qiskit.circuit.QuantumCircuit` object that has a
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:class:`~qiskit.circuit.ControlledGate` with an open control the output
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would be as if all controls were closed independent of the specified
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control state. This would result in a different circuit being created
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from :meth:`~qiskit.circuit.QuantumCircuit.from_qasm_str` if
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parsing the generated QASM.
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This was fixed by updating the QASM output from
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:meth:`~qiskit.circuit.QuantumCircuit.qasm` by defining a composite gate
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which uses :class:`~qiskit.circuit.XGate` to implement the open controls.
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The composite gate is named like ``<original_gate_name>_o<ctrl_state>``
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where ``o`` stands for open control and ``ctrl_state`` is the integer value
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of the control state.
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Fixed `#5443 <https://github.com/Qiskit/qiskit-terra/issues/5443>`__
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