code: def RZ(angle, qubit):
      
      return Gate(name="RZ", params=[angle], qubits=[unpack_qubit(qubit)])
docs: Produces the RZ gate::
  
          RZ(phi) = [[cos(phi / 2) - 1j * sin(phi / 2), 0]
                     [0, cos(phi / 2) + 1j * sin(phi / 2)]]
  
      This gate is a single qubit Z-rotation.
  
      :param angle: The angle to rotate around the z-axis on the bloch sphere.
      :param qubit: The qubit apply the gate to.
      :returns: A Gate object.