code: def correlator(A, B):
      
      correlators = []
      for i in range(len(A)):
          correlator_row = []
          for j in range(len(B)):
              corr = 0
              for k in range(len(A[i])):
                  for l in range(len(B[j])):
                      if k == l:
                          corr += A[i][k] * B[j][l]
                      else:
                          corr -= A[i][k] * B[j][l]
              correlator_row.append(corr)
          correlators.append(correlator_row)
      return correlators
docs: Correlators between the probabilities of two parties.
  
      :param A: Measurements of Alice.
      :type A: list of list of
               :class:`sympy.physics.quantum.operator.HermitianOperator`.
      :param B: Measurements of Bob.
      :type B: list of list of
               :class:`sympy.physics.quantum.operator.HermitianOperator`.
  
      :returns: list of correlators.