光的两种模式间的一种非经典性质的转移

利用与不变量有关的幺正变换方法并利用数值计算，研究了光的两种模式间的一种非经典性质的转移问题：Fock态(为非经典态)与相干态的相互转换问题. 关键词：     

Entanglement transfer via two arrays of coupled resonator waveguides

We propose a scheme for transferring entanglement through two independent arrays of coupled resonator waveguides, where a three-level atom is embedded in each resonator. We investigate the entanglement dynamics of the transferred state. The influence of initial states and applied lasers on the entanglement sudden death phenomenon is also discussed. Furthermore, we study the dynamics of pairwise quantum correlations measured by the quantum discord.     

One Atom in an Optical Cavity： Entanglement and Applications to Quantum Computation

We propose a scheme to implement two-bit .quantum phase gates and one-bit unitary gates by using the two- mode two-photon Jaynes Cummings model. The entanglement between the atom and cavity is also investigated in the presence of phase decoherence. It is found that there is stationary entanglement that is sensitive with the detuning     

Quantum Entanglement of Two Atoms Inside an Optical Cavity

We investigate the system,which consists of two two-level atoms confined in a linear trap which has been surrounded by an optical cavity,with the Milburn model of intrinsic decoherence,and find an explicit analytical solution of the Milburn equation.the entanglement between the two atoms is then calculated by making use of concurrence.The influence of intrinsic decoherence on the entanglement is also discussed.     

Influence of Multi-Photon Process on Entanglement of Interacting System of the Qubit and Thermal Field

We study the system of a single qubit couples to a single mode thermal field according to a multi-photon Jaynes-Cummings-type interaction with phase decoherence. Both the time evolving entanglement and the stationary state entanglement are calculated by adopting the log-negativity as a measure. It is found that the multi-photonprocess can enhance the stationary state entanglement of this system and can enlarge the range of the parameter Δ/g and the mean photon number of initial thermal field in which the stationary state is distillable.     

二次型含时间的谐振子系统的压缩态和压缩相干态

利用演化算符方法研究了最一般的二次型含时间的谐振子系统的时间演化和压缩态问题,进一步讨论了脉动质量的受迫谐振子系统的压缩态和高n压缩态.最后,构造了在时间演化过程中保持最小测不准关系的压缩相干态和高n压缩相干态. 关键词：     

力学Berry相因子和相应的经典拓扑相角

最近,有人讨论了"力学Aharonov-Bohm效应",并获得了实验验证.本文则进而研究并计算了"力学Berry相因子"及其相应的经典拓扑相角.     

Entanglement and coherence of a three-level atom in Λ configuration interacting with two fields

We investigate the entanglement of a three-level atom in λ configuration interacting with two quantized field modes by using logarithmic negativity. Then, we study the relationship of the atomic coherence and the entanglement between two fields which are initially prepared in vacuum or thermal states. We find that if the two fields are prepared in thermal states, the atomic coherence can induce the entanglement between two thermal fields. However, there is no coherence-induced entanglement between two vacuum fields.     

广义含时谐振子的精确解和Berry相因数

本文利用Lewis-Riesenfeld的量子理论,求出广义含时谐振子的精确解。研究了此精确解的绝热渐近极限,并求出广义谐振子在量子绝热情形的Berry相因数。进而利用此精确解构造了广义含时谐振子的相干态,并得到相应的经典Hannay角。     

O(3)非线性σ模型中拓扑项的可移性问题

O(3)非线性σ模型的经典理论中的拓扑项可以用一透当的正则变换移去.本文研究了该模型的量子理论,求出了上述正则变换相应的量子么正变换,并讨论了此么正变换的意义及拓扑项的可移性问题.