scqubits.TunableTransmon.matrixelement_table#

TunableTransmon.matrixelement_table(operator, evecs=None, evals_count=6, filename=None, return_datastore=False)#

Returns table of matrix elements for operator with respect to the eigenstates of the qubit. The operator is given as a string matching a class method returning an operator matrix. E.g., for an instance trm of Transmon, the matrix element table for the charge operator is given by trm.op_matrixelement_table(‘n_operator’). When esys is set to None, the eigensystem is calculated on-the-fly.

Parameters:

  • operator (str) – name of class method in string form, returning operator matrix in qubit-internal basis.

  • evecs (Optional[ndarray]) – if not provided, then the necessary eigenstates are calculated on the fly

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

  • filename (Optional[str]) – output file name

  • return_datastore (bool) – if set to true, the returned data is provided as a DataStore object (default value = False)

Return type:

Union[DataStore, ndarray]