mirror of https://github.com/Qiskit/qiskit.git
75c0e46faf
* Migrate measure mitigation from ignis for QuantumInstance This commit migrates the measurement mitigation code from qiskit-ignis into qiskit-terra for use with the QuantumInstance class. The QuantumInstance class's usage of the measurement mitigation from ignis is the one thing blocking us from deprecating qiskit-ignis completely. By embedding the code the quantum instance depends on inside qiskit.utils users of QuantumInstance (and therefore qiskit.algorithms) can construct and use measurement mitigation in it's current form. The use of this migrated module is only supported for use with the QuantumInstance class and is explicitly documented as internal/private except for how it gets used by the QuantumInstance. There is ongoing work to create a standardized mitigation API in #6485 and #6748, this does not preclude that work, but we should adapt this as part of those efforts to use the standardized interface. Ideally this would have been made a private interface and not exposed it as user facing (in deference to the standardization effort), but unfortunately the QuantumInstance expects classes of these classes as it's public interface for selecting a mitigation technique which means users need to be able to use the classes. However, as only the classes are public interfaces we can adapt this as we come up with a standardized mitigation interface and rewrite the internals of this and how the QuantumInstance leverages mitigators to use the new interface. A good follow-up here would be to adapt the mitigator selection kwarg to deprecate the use of classes and then we can make things explicitly private in the migrated code and wait for #6495 and #6748 to be ready for our user facing API. I opted to not include that in this PR to minimize changes to just what we migrated from ignis and update usage of old ignis classes to rely on the migrated version. * Update releasenotes/notes/ignis-mitigators-70492690cbcf99ca.yaml Co-authored-by: Steve Wood <40241007+woodsp-ibm@users.noreply.github.com> * Finish release notes * Move API stability warning to the top * Apply suggestions from code review Co-authored-by: Jake Lishman <jake@binhbar.com> * Remove unecessary test subclassing * Fix skip logic in algorithm mitigation tests * Fix exception handling on missing ignis in algorithms * Assert deprecation message for ignis use mentions ignis * Make filters module properly private * Fix lint Co-authored-by: Steve Wood <40241007+woodsp-ibm@users.noreply.github.com> Co-authored-by: Jake Lishman <jake@binhbar.com> |
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