三能级原子与奇偶纠缠相干光作用的光场压缩  

Light Squeezing of the System of the Two-Mode Odd-Even Entangled Coherent States Field Interacting with a Three-Level Atom

作　　者：方曙东[1] 曹卓良[1] 

机构地区：[1]池州师范专科学校物理系

出　　处：《光学学报》2005年第12期1697-1701,共5页Acta Optica Sinica

摘　　要：采用求解薛定谔方程和数值计算方法,研究了V型三能级原子与双模奇偶纠缠相干光场相互作用过程中的光场压缩效应,讨论了压缩效应与双模奇偶纠缠相干光场的纠缠程度、系统失谐量、双模光场的平均光子数和原子基态概率幅的依赖关系。结果表明:光场压缩效应与双模奇偶纠缠相干光场的纠缠程度、失谐量、平均光子数和原子初态相关联:双模纠缠相干光场处于非纠缠状态时的光场压缩量比光场处于纠缠状态时要大;原子处在单纯的基态或激发态时光场都有明显的压缩现象出现;而原子初态中基态和激发态的概率幅较接近时无光场压缩现象;无论光场是否处于纠缠态,只有两模平均光子数接近时,光场才会出现压缩效应。By means of solving Schrodinger equation and numerical calculations, the light squeezing effects in the system of the two-mode odd-even entangled coherent optical field interacting with a V-type three-level atom discussed. The results indicate that the light squeezing effects depend on the degree of entanglement of the two-mode odd-even entangled coherent optical fields, the detuning, the mean photon numbers and the atomic initial state. If the two-mode entangled coherent optical field is in unentangled states, its squeezing value is larger than that of the twomode entangled coherent optical field in entangled states. When the atom is prepared in ground state or excited state initially, there appear obvious squeezing effects for the coherent optical field. On the contrary, if the initial state atom is prepared in ground state and excited state with adjacent amplitude, the squeezing effects in the system of the two-mode odd-even entailed coherent optical field will vanish. Whenever the optical fields are in entangled states or not, the squeezing effects will appear with two coherent states having the same mean photon number.

关 键 词：量子光学 双模奇偶纠缠相干光场 V型三能级原子 光场压缩 

分 类 号：O431.2[机械工程—光学工程]