def to_dict(self):
        """
        Create a dictionary representation of a KrausModel.

        For example::

            {
                "gate": "RX",
                "params": np.pi,
                "targets": [0],
                "kraus_ops": [            # In this example single Kraus op = ideal RX(pi) gate
                    [[[0,   0],           # element-wise real part of matrix
                      [0,   0]],
                      [[0, -1],           # element-wise imaginary part of matrix
                      [-1, 0]]]
                ],
                "fidelity": 1.0
            }

        :return: A JSON compatible dictionary representation.
        :rtype: Dict[str,Any]
        """
        res = self._asdict()
        res['kraus_ops'] = [[k.real.tolist(), k.imag.tolist()] for k in self.kraus_ops]
        return res