scqubits.utils.spectrum_utils.matrix_element#

scqubits.utils.spectrum_utils.matrix_element(state1, operator, state2)[source]#

Calculate the matrix element <state1|operator|state2>.

Parameters:

  • state1 (Union[ndarray, Qobj]) – state vector/ket

  • state2 (Union[ndarray, Qobj]) – state vector/ket

  • operator (Union[ndarray, csc_matrix, Qobj]) – representation of an operator

Return type:

Union[float, complex]

Returns:

matrix element