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Build # 5459709115

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Commit Message

Stark Ramsey XY Amp Scan experiment (#1009)

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### Summary

This PR adds `StarkRamseyXYAmpScan` experiment and a dedicated fitter.
This experiment characterizes the Stark shift vs tone amplitude curve to
calibrate a required amplitude to cause a target shift. One can also do
the same experiment with `StarkRamseyXY`, but this experiment avoids two
dimensional sweep of tone length and amplitude.

This experiment returns several quantities that may be used to run
following spectroscopy experiments. Since Stark shift is asymmetric with
respect to f_S = 0 because of the higher levels anti-crossings on f_S <
0 side, parameters are defined for each shift direction:

- `stark_pos_coef_o1`
- `stark_pos_coef_o2`
- `stark_pos_coef_o3`
- `stark_neg_coef_o1`
- `stark_neg_coef_o2`
- `stark_neg_coef_o3`
- `stark_ferr`

### Details and comments

In
[c2b3d85](https://github.com/Qiskit/qiskit-experiments/pull/1009/commits/c2b3d8534)
I decided to add linear terms (stark_pos_coef_o1, stark_neg_coef_o1) to
the fit model. Although coefficients of these terms are small, these are
the most effective terms to account for the asymmetry at around x=0;
quadratic term doesn't add asymmetry, and cubit term is too small in
this regime.


![image](https://github.com/Qiskit/qiskit-experiments/assets/39517270/321b53f1-2c5e-4d45-9c4d-3ec225cb953d)

In above experiment result, Ramsey Y curves show asymmetry which is fit
well by the linear terms. The chisq is not great and we need some
discussion for implementation of the sys... (continued)

Run Details

12030 of 13615 relevant lines covered (88.36%)

3.53 hits per line