Qiskit-Extensions
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qiskit-experiments
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web-flowStark Ramsey XY Amp Scan experiment (#1009) <!-- ⚠️ If you do not respect this template, your pull request will be closed. ⚠️ Your pull request title should be short detailed and understandable for all. ⚠️ Also, please add it in the CHANGELOG file under Unreleased section. ⚠️ If your pull request fixes an open issue, please link to the issue. ✅ I have added the tests to cover my changes. ✅ I have updated the documentation accordingly. ✅ I have read the CONTRIBUTING document. --> ### 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.  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)
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