考虑两个初始处于纠缠态的Λ型三能级原子，将其中一原子注入双模腔中与光场发生共振相互作用的情况。采用数值计算方法，研究了对腔外原子的选择测量对腔内原子偶极压缩效应的影响。研究结果表明：采用选择原子测量方法，通过对腔外原子进行选择性测量，可增强腔内原子的偶极压缩效应。

Considering two Λ-type three-level atoms initially in the entangled state, one atom is poured into the cavity and interacts with a two-mode cavity. The dipole squeezing of an atom inside the cavity are investigated. The influences of the selective atomic measurement and the intensity of the coherent field which interacts with atom on dipole squeezing of an atom inside the cavity are discussed. The result obtained by numerical calculations shows that the dipole squeezing of an atom inside the cavity can be strengthened through selective atomic measurement for atom outside of the cavity.