控制强度对Bragg光学双稳系统混沌控制的影响

对Bragg光学双稳系统的混沌态提出位相延时反馈的控制方法 ,用数值方法研究了该系统的混沌态在控制强度调制下的动力学行为。结果表明 ,控制强度的取值不同可以使受控系统的状态呈现多种演化模式 ,调节控制强度值不断增加 ,能够有效地将受控系统稳定在所需的周期态和不动点上     

Quantum State Transfer between Two Distant Atoms by Connecting Two Cavities via Optical Fibres

A scheme is proposed to unconditionally implement state transfer between two distant atoms by sending the atoms across two distant cavities connected via an optical fibre, respectively. The field state, which preserves the information about the first atom, is transmitted from one cavity to the other along the fibre. A Faraday rotator integrated in the fibre can be designed to completely stop the fields reflected from the second cavity, thus after the field interacts with the second atom for a defined time, the state transfer can be accomplished with unit efficiency.     

Accurate Bound-State Spectra for Hydrogenic Donors in GaAs-（Ga, Al）As Quantum Dots

We extend the analytical transfer matrix method （ATMM） to study the bound-state spectra for hydrogenic donors in GaAs-（Ga, Al）As quantum dots. Comparison of the energy eigenvalues from ATMM with those from the wavefunction method reveals wavefunction results show large deviation from the exact ones when the radius of quantum dots ro become large, whereas ATMM is better accuracy.     

Entanglement swapping with atoms separated by long distance

This paper proposes a scheme for entanglement swapping based on cavity QED. The two atoms to be entanglement-swapped can be separated over long distance. The scheme is a non-post-selection one with the success probability of 1/2.     

混沌系统的变量变化率反馈控制方法研究

设计了一种控制连续非线性系统中混沌的新方法--变量变化率脉冲反馈(VRPF)方法.介绍了VRPF方法的控制原理以及反馈系数和脉冲间隔的选择技巧.将此方法应用到BZ反应3D模型系统混沌的控制中,计算机仿真模拟显示,通过恰当地选择反馈系数和脉冲间隔,可以将系统稳定在1p、2p、3p、4p、…、2n×3mp (n、m为整数)这样不同的周期轨道,从而使系统的功率谱也由混沌态时的连续谱转变为具有分立单峰的分立谱.此外,仿真模拟还发现VRPF方法具有极宽的控制域.     

Critical radius and dipole polarizability for a confined system

The analytical transfer matrix method （ATMM） is applied to calculating the critical radius τc and the dipole polarizability αd in two confined systems： the hydrogen atom and the Hulthēén potential. We find that there exists a linear relation between τe^1/2 and the quantum number nτ for a fixed angular quantum number l, moreover, the three bounds of αd（αd^K,αd^B,αd^U） satisfy an inequality：αd^K≤αd^B≤αd^U,A comparison betwen the ATMM,the exact numerical analysis, and the variational wavefunctions shows that our method works very well in the systems.     

非简并双光子微脉塞的发射几率

将简并双光子微脉塞的量子理论推广到非简并情形， 给出了原子发射几率的解析表达式并且分析了相应的性质.发现由于在微脉塞中存在两种腔场模式，导致有两个自由度来改变原子在经过腔场时所受到的势场，因此非简并双光子微脉塞的发射几率的行为不同于简并双光子情况下的发射几率.     

A Scheme for Preparation of W-Type Entangled Coherent State of Three-Cavity Fields

We present an experimental scheme to prepare the three-cavity W-type entangled coherent state in the context of dispersive cavity quantum electrodynamics. The discussion of our scheme indicates that it can be realized by current technology.     

混沌系统的变量变化率反馈控制方法研究

设计了一种控制连续非线性系统中混沌的新方法———变量变化率脉冲反馈 (VRPF)方法 .介绍了VRPF方法的控制原理以及反馈系数和脉冲间隔的选择技巧 .将此方法应用到BZ反应 3D模型系统混沌的控制中 ,计算机仿真模拟显示 ,通过恰当地选择反馈系数和脉冲间隔 ,可以将系统稳定在 1p、2p、3p、4p、…、2 n× 3mp (n、m为整数 )这样不同的周期轨道 ,从而使系统的功率谱也由混沌态时的连续谱转变为具有分立单峰的分立谱 .此外 ,仿真模拟还发现VRPF方法具有极宽的控制域