scqubits.TunableTransmon.plot_matrixelements#

TunableTransmon.plot_matrixelements(operator, evecs=None, evals_count=6, mode='abs', show_numbers=False, show3d=True, **kwargs)#

Plots matrix elements for operator, given as a string referring to a class method that returns an operator matrix. E.g., for instance trm of Transmon, the matrix element plot for the charge operator n is obtained by trm.plot_matrixelements(‘n’). When esys is set to None, the eigensystem with which eigenvectors is calculated.

Parameters:

  • operator (str) – name of class method in string form, returning operator matrix

  • evecs (Optional[ndarray]) – eigensystem data of evals, evecs; eigensystem will be calculated if set to None (default value = None)

  • evals_count (int) – number of desired matrix elements, starting with ground state (default value = 6)

  • mode (str) – idx_entry from MODE_FUNC_DICTIONARY, e.g., ‘abs’ for absolute value (default)

  • show_numbers (bool) – determines whether matrix element values are printed on top of the plot (default: False)

  • show3d (bool) – whether to show a 3d skyscraper plot of the matrix alongside the 2d plot (default: True)

  • **kwargs – standard plotting option (see separate documentation)

Return type:

Union[Tuple[Figure, Tuple[Axes, Axes]], Tuple[Figure, Axes]]