附加克尔介质依赖强度耦合J-C模型中原子的量子特性

研究了附加克尔介质依赖强度耦合Jaynes-Cummings模型中原子反转特性，并采用密度算符间的距离研究了该模型中原子量子态的演化规律。详细地讨论了克尔非线性作用的强弱以及初始相干光场的强弱对原子反和原子量子态的演化的影响。结果表明：克尔效应的增强使得原子反转演化的周期减小（gtR≈π/√x^2/g^2 1）；在初始相干光场较弱时（－↑n＝10），克尔介质的非线性相互作用破坏了原子态演化的周期性，但在初始相干光场较强时（－↑n＝50），克尔效应使原子态的演化仍近似具有周期性，且与原子反转演化的周期相同（gtR≈π/√x^2/g^2 1）。无论初始相干光场强弱如何，随着克尔效应的增强，原子回到初态的布居几率增大，当x/g=5时，原子几乎持续地处于初始的激发态。

Quantum Propreties of the Atom in the Intensity Dependent Coupling J-C Model with an Additional Kerr Medium

The properties of the atomic inversion and the atomic state evolution are investigated by using the distance between density operaters in the intensity dependent coupling Janyes-Cummings model with an additional Kerr medium. The effect of nonlinearity interaction of Kerr medium and the average photon number of initial coherent field on the quantum properties of the atom are discussed. The result shows: the period of the atomic inversionis decreasing with the increase of the Kerr effect When the initialcoherent field is not great (n=10), the periodicity of the atomic state evolution is destroyed by Kerr effect, otherwise, when the initial coherent field is great (n=50), the atomic state evolution has periodicity approximately, also, the period is the same as atomic inversion Whether the average photon number of the initial coherent field is greator small, the probability that the atom locates initial state is increasing with the increase ofthe Kerr effect, when x/g=5, the atom always locates initial excited state nearly.