双模SU(2)相干态场与一个Λ型三能级原子共振相互作用系统的光场反聚束效应

Anti-Bunching Effect of the Field in the System of a Two-Mode SU(2) Coherent Field Resonantly Interacting with a Three-Level Λ-Type Atom

采用全量子理论和数值计算方法,研究了初始处于SU(2)相干态的双模腔场与一个Λ型三能级原子共振相互作用系统的光场反聚束效应。讨论了在没有对原子进行态选择测量和直接对原子进行态选择测量的两种情况下,两个腔模总光子数、配分参量、耦合系数和原子初态对光场反聚束效应的影响。结果表明:当两个腔模的耦合系数相同时,光场的两个模都呈现反聚束效应;原子初始处于低能级或直接对原子进行态选择测量,a模的反聚束效应明显增强;减少两个腔模的总光子数M,光场的反聚束效应明显增强;当两个腔模的耦合系数相同并对原子进行态选择测量时,光场的反聚束效应不随时间改变。

Anti-bunching effect of the field in the system of a two-mode field initially in an SU（2） coherent state resonantly interacting with a three-level Λ-type atom are investigated by means of quantum theory and nu-merical calculations.The dependence of the anti-bunching effect on the total photon of the tow-mode,the parti-tion parameter,the coupling constant and the atomic initial state is discussed for two cases：（1） no state-selective atomic measurement;（2） direct state-selective atomic measurement.The results indicate： the anti-bunching effect of the two mode of the field exhibits when the two coupling coefficients are the same;a mode anti-bunching ef-fect is distinctly enhanced when the atom is initially on the lower level or direct state-selective measurement is performed on the atom;the anti-bunching effect of the two mode of the field is distinctly enhanced when the to-tal photon number of the two-mode is decreased;the anti-bunching effect of the field does not change over time when the two coupling coefficients are the same and the state-selective measurement is performed on the atom.