mirror of https://github.com/Qiskit/qiskit.git
46 lines
2.4 KiB
YAML
46 lines
2.4 KiB
YAML
---
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features:
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Added method :meth:`~qiskit.dagcircuit.DAGCircuit.remove_cregs`
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to class :class:`~qiskit.dagcircuit.DAGCircuit` to support classical
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register removal.
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Added method :meth:`~qiskit.dagcircuit.DAGCircuit.remove_clbits`
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to class :class:`~qiskit.dagcircuit.DAGCircuit` to support the removal
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of idle classical bits. Any classical registers referencing a removed bit
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are also removed.
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fixes:
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Fixed determination of final operations (barriers and measures) in pass
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:class:`~qiskit.transpiler.passes.RemoveFinalMeasurements` and in method
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:meth:`~qiskit.circuit.QuantumCircuit.remove_final_measurements`
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of class :class:`~qiskit.circuit.QuantumCircuit` which previously considered
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only nodes immediately preceding an output node.
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Fixed determination of final operations in pass
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:class:`~qiskit.transpiler.passes.RemoveFinalMeasurements` and in method
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:meth:`~qiskit.circuit.QuantumCircuit.remove_final_measurements` of class
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:class:`~qiskit.circuit.QuantumCircuit` which could wrongly consider a barrier
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to be final, even if other circuit operations followed it.
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Fixed multi-bit classical register removal in pass
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:class:`~qiskit.transpiler.passes.RemoveFinalMeasurements` and in method
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:meth:`~qiskit.circuit.QuantumCircuit.remove_final_measurements` of class
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:class:`~qiskit.circuit.QuantumCircuit` where classical
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registers were not removed even if other bits were idle, unless a final measure
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was done into each and every bit. Now, classical registers that become idle as a
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result of removing final measurements and barriers are always removed. Classical
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bits are removed if they are referenced only by removed registers or are not
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referenced at all and became idle due to the removal. This fix also adds proper
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handling of registers with shared underlying bits.
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Fixed an issue with :obj:`~qiskit.transpiler.passes.RemoveFinalMeasurements`
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which could cause the resulting :obj:`.DAGCircuit` to become invalid. See
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`#7196 <https://github.com/Qiskit/qiskit-terra/pull/7196>`__ for more details.
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Fixed an issue with method :meth:`~qiskit.circuit.QuantumCircuit.remove_final_measurements`
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of class :class:`~qiskit.circuit.QuantumCircuit` that caused :attr:`.QuantumCircuit.clbits`
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to be incorrect after invocation. Refer to
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`#7089 <https://github.com/Qiskit/qiskit-terra/issues/7089>`__ for details.
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