DragFitter
class DragFitter(backend_result, xdata, qubits, fit_p0, fit_bounds=None)
Bases: qiskit.ignis.characterization.fitters.IQFitter
Drag Experiment fitter
See IQFitter __init__
fit_p0 is [a, x0, c] where the fit is a*(x-x0)^2+c
Methods
add_data
DragFitter.add_data(results, recalc=True, refit=True)
Add new execution results to previous execution results
Parameters
- results (
Union[Result,List[Result]]) – new execution results - recalc (
bool) – whether tp recalculate the data - refit (
bool) – whether to refit the data
drag_amplitude
DragFitter.drag_amplitude(qind=- 1)
Return the drag amplitude from the fit
Parameters
qind (int) – qubit index
Returns
drag amp
Return type
float
fit_data
DragFitter.fit_data(qid=- 1, p0=None, bounds=None, series=None)
Fit the curve.
Compute self._params and self._params_err
Parameters
- qid (
int) – qubit for fitting. If -1 fit for all the qubits - p0 (
Optional[List[float]]) – initial guess, equivalent to p0 in scipy.optimize - bounds (
Optional[Tuple[List[float],List[float]]]) – bounds, equivalent to bounds in scipy.optimize - series (
Optional[str]) – series to fit (if None fit all)
guess_params
DragFitter.guess_params(qind=0)
Guess parameters for the drag fit
Parameters
qind (int) – qubit index
Returns
guess parameters
[a, x0, c] where the fit is
Return type
list
plot
DragFitter.plot(qind, series='0', ax=None, show_plot=False)
Plot the data and fit
Parameters
- qind (int) – qubit index
- series (str) – data series to plot (for rabi data always ‘0’)
- ax (Axes) – matploblib axes (if none created)
- show_plot (bool) – do plot.show
Returns
Plot axes
Return type
Axes
Attributes
backend_result
Return the execution results
Return type
Union[Result, List[Result]]
description
Return the fitter’s purpose, e.g. ‘T1’
Return type
str
fit_fun
Return the function used in the fit, e.g. BaseFitter._exp_fit_fun
Return type
Callable
measured_qubits
Return the indices of the qubits to be characterized
Return type
List[int]
params
Return the fit function parameters that were calculated by curve_fit
Return type
List[float]
params_err
Return the error of the fit function parameters
Return type
List[float]
series
Return the list of series for the data
Return type
Optional[List[str]]
xdata
Return the data points on the x-axis, the independenet parameter which is fit against
Return type
Union[List[float], array]
ydata
Return the data points on the y-axis
The data points are returning in the form of a list of dictionaries:
ydata[i][‘mean’] is a list, where item
no. j is the probability of success of qubit i for a circuit that lasts xdata[j].
ydata[i][‘std’] is a list, where ydata[‘std’][j] is the
standard deviation of the success of qubit i.
Return type
List[Dict]