THE POTENTIAL MODEL INVESTIGATION OF STARK EFFECT IN CAESIUM RYDBERG STATE ATOMS AND COMPARISON WITH EXPERIMENT

The potential model method for computation of Stark structure of Cs Rydberg states atoms and oscillator strength is described, for external electric fields varying from 0 to 600V/cm. Anticrossing, l-mixing and n-mixing phenomena are observed clearly from the map of Stark. Corresponding experiment is performed under the same condition, and the two results are in good agreement with each other within the experimental uncertainty.     

非共振相互作用系统中密度算符间距的演化

考虑到失谐量和原子初始相干性,给出了任意初态分布的二能级原子与任意单模场相互作用的密度算符间距的一般表达式.着重讨论了一个任意态分布的二能级原子与相干态光场相互作用时失谐量对密度算符间距演化的影响.结果表明：密度算符间距明显地依赖于失谐量的取值. 关键词：     

Optical pumping and population transfer of nuclear-spin states of caesium atoms in high magnetic fields

Nuclear-spin states of gaseous-state Cs atoms in the ground state are optically manipulated using a Ti:sapphire laser in a magnetic field of 1.516T, in which optical coupling of the nuclear-spin states is achieved through hyperfine interactions between electrons and nuclei. The steady-state population distribution in the hyperfine Zeeman sublevels of the ground state is detected by using a tunable diode laser. Furthermore, the state population transfer among the hyperfine Zeeman sublevels, which results from the collision-induced modification \delta a(\bm S \cdot \bm I) of the hyperfine interaction of Cs in the ground state due to stochastic collisions between Cs atoms and buffer-gas molecules, is studied at different buffer-gas pressures. The experimental results show that high-field optical pumping and the small change \delta a(\bm S \cdot \bm I) of the hyperfine interaction can strongly cause the state population transfer and spin-state interchange among the hyperfine Zeeman sublevels. The calculated results maybe explain the steady-state population in hyperfine Zeeman sublevels in terms of rates of optical-pumping, electron-spin flip, nuclear spin flip, and electron-nuclear spin flip-flop transitions among the hyperfine Zeeman sublevels of the ground state of Cs atoms. This method may be applied to the nuclear-spin-based solid-state quantum computation.     

Generation and application of a controllable multi-atom entangled state

In this paper, we present a scheme to prepare a set of the multi-atom entangled states by the cavity quantum electrodynamics (QED) technology. The multi-atom entangled states have some particular entanglement properties. For example, the remaining reduced density matrices ρ_{ij} still retain entanglement or disentanglement when any N-2 atoms of the N atoms are traced out, which can be chosen freely according to our need, and the relative entanglement strength of any pair of atoms (measured by the concurrence) can be arbitrarily adjusted. In addition, they may be completely symmetric under the exchange of any two atoms, and perform certain quantum information tasks, such as telecloning, teleportation, secret sharing and so on.     

铁磁系统中介观畴壁运动的波函数及其量子效应

本文从经典铁磁系统的畴壁运动方程出发 ,按照通常的正则量子化方法并通过幺正变换 ,求得了铁磁系统中介观畴壁的能级和相应的本征矢量 ,给出了当体系处于任意本征态时介观畴壁的坐标、动量的量子涨落以及两者之间的测不准关系 .进一步揭示了在低温下铁磁体畴壁运动的量子性的确来源于体系零点振动的涨落     

Sr原子|M|=1电场标度能谱

通过同步改变激光扫描波长和外加电场大小,保持标度能为常量,将Sr原子从基态激发到|M|=1的激发态,得到了标度能ε=-3.00,-2.50,-1.88时的常数标度能谱.实验傅里叶变换回归谱与氢原子闭合轨道理论计算进行了比较,峰值位置符合较好,峰值强度则受Sr原子实效应影响较大.     

不同序列拉曼光脉冲对原子重力仪灵敏度的影响

研究了不同序列拉曼光脉冲对原子重力仪灵敏度的影响.结果表明,通过调节脉冲间隔可以改善原子干涉重力仪的灵敏度.在标准配置下,只考虑重力及一阶重力梯度时,三脉冲序列（π/2-π-π/2）的原子干涉重力仪具有较大的灵敏度,四脉冲序列（π/2-π-π-π/2）的原子干涉重力仪对重力不敏感,可用来测量重力梯度,五脉冲作用会降低原子干涉重力仪的灵敏度. 关键词： 原子重力仪 拉曼激光脉冲序列 灵敏度     

算符(f(“非汉字符号”))~k正交归一本征态的非经典特性

证明了算符 (a^ f(n^) ) k(k≥ 3)的k个正交归一本征态的完备性 ,引入了反聚束效应和一种新的高阶压缩 ,研究了算符 (a^ f(n^) ) k 的k个本征态的反聚束效应和高阶压缩特性 .结果表明 ,这些态可以构成一个完备的希尔伯特(Hilbert)空间 ,它们均可呈现反聚束效应 ,且当k为偶数时它们可呈现M阶 [M =(n +1 2 )k ;n =0 ,1,2 ,… ]压缩效应     

Q变形非简谐振子湮没算符高次幂的本征态及其高阶压缩特性

构造出了Q变形的非简谐振子湮没算符K次幂(K≥3)的K个正交归一本征态,给出了它们的完备性证明,并且研究了它们的高次方压缩特性.结果表明,它们能够组成一个完备的Hilbert空间;且当K为偶数时,这些本征态均可呈现M次方[M=(n+1/2)K,n=0,1,2,…]压缩效应.     

基于Rb原子电磁诱导透明的量子干涉实验研究

报道了基于85RbD2线电磁诱导透明(EIT)的量子干涉现象,发现当一耦合光和探测光之间满足拉曼共振条件时出现电磁诱导透明现象,在某些条件下也观察到电磁诱导吸收(EIA).而当用一束耦合光和一束泵浦光共同作用于5S1/2,F=3→5P3/2,F′=3和5S1/2,F=3→5P3/2,F′=4能级上时,探测光的吸收谱表现出三峰结构,并且峰强弱与两耦合光之间的相对强度有关.