code: def to_dict(self):
          
          res = self._asdict()
          res['kraus_ops'] = [[k.real.tolist(), k.imag.tolist()] for k in self.kraus_ops]
          return res
docs: 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]