Qiskit is going to deprecate `qiskit.result.mitigation`

[1ucian0]

See https://github.com/Qiskit/qiskit/issues/12838

qiskit-experiments uses this module in https://github.com/Qiskit-Extensions/qiskit-experiments/blob/main/qiskit_experiments/library/characterization/analysis/local_readout_error_analysis.py

Consider vendor it here if you still needed it.

[eliarbel]

@dcmckayibm FYI

[nkanazawa1989]

Mitigated QPT experiment depends on the local readout error experiment. This experiment is used to reconstruct channel on the noisy POVMs. This effectively reduces statistical error in the outcome (of course we can just run QPT analysis on error mitigated counts if we don't care the error).

[dcmckayibm]

We can still park if here if people like the code

[wshanks]

The mitigators were moved in Experiments in https://github.com/qiskit-community/qiskit-experiments/pull/1484. The deprecation warning in Qiskit suggests switching to mthree. Using the classes here would be a smoother transition, but mthree is more dedicated to readout mitigation than Qiskit Experiments is and is in the main Qiskit organization, so maybe it still makes more sense. Based on the deprecation warning message, I looked at switching the Qiskit Experiments usage to mthree but the API was very different from the mitigators and I didn't see an easy way to make the switch.