Pass effective noise factors to extrapolator

[maxi-bon]

What is the current behavior?

The ZNE runs give the following warning:

(From https://github.com/qiskit-community/prototype-zne/blob/main/zne/noise_amplification/folding_amplifier/folding_amplifier.py in line 147)

UserWarning: Rounding of noise factor: Foldings are performed with noise factor 1.11 instead of specified noise factor 1.10 which amounts to a relative error of 1.01%.

and similar for other noise factors. The intended noise factor is 1.10, and I believe also curvefit takes 1.10

What is the expected enhancement?

The curvefit should take the "correct" value of 1.11 actually sent to the IBM device. This value should also be propagated (e.g., in the meta data)

Context

No response

Suggestions

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