The phase properties of the field in the Jaynes-Cummings model with an additional Kerr medium are discussed from the point of view of the new phase formalism of Pegg and Barnett.

• 运用Pegg-Barnett厄米位相公式；研究了附加克尔(Kerr)介质Jaynes-Cummings(J-C)模型场的位相特性.