耦合压缩Landau态

引入Landau体系（带电粒子在垂直于均匀磁场平面内的运动）的耦合压缩态．这类耦合压缩态所给出的关于带电粒子圆周运动的信息与非耦合压缩Landau态所给出的信息存在很大的差异． 关键词：     

相位Landau态

引入Landau系统(带电粒子在垂直于均匀磁场平面内的运动)的相位本征态，利用这些本征态可方便地描述带电粒子圆周运动，且所得结果与规范的选择无关. 关键词： Landau系统 相位本征态     

Landau规范下均匀磁场中带电粒子圆心相干态计算

在Ｌａｎｄａｕ规范下计算出均匀磁场中带电粒子的圆心相干态。利用这些圆心相干态可方便地描述带电粒子的圆周运动。这些圆周运动与经典力学的结果比较表明，圆心相干态描述系综中的平均运动． 关键词：     

有限维希尔伯特空间奇偶相干态压缩特性的数值研究

运用数值计算方法研究了有限维希尔伯特空间谐振子奇偶相干态的压缩特性.研究表明,有限维空间奇偶相干态展现了与通常奇偶相干态截然不同的压缩性质,奇相干态不存在二阶压缩但存在振幅平方压缩;偶相干态不仅存在压缩而且存在振幅平方压缩.通常的奇偶相干态是上述奇偶相干态的特例.     

压缩奇偶相干态的量子统计性质

用压缩算子作用在奇偶相干态上即可得到压缩奇偶相干态.本文研究了这类量子态的统计特性.结果表明,压缩奇相干态和压缩偶相干态都能处于压缩状态,它们的光子亦都可能出现反聚束的现象.     

原子薛定谔猫态中角动量的压缩及其时间演化

在低Q值腔内，原子相干态在一些特定时刻可以演化为原子薛定谔猫态.讨论了在这种原子薛定谔猫态中原子角动量的涨落和高阶涨落.根据不确定性原理，进一步研究了原子角动量的压缩和高阶压缩性质及其演化.研究表明，原子薛定谔猫态可以被压缩到二阶和六阶，但不能被压缩到四阶.当原子薛定谔猫态中被叠加的原子相干态数为无限多项时，其压缩特性与原子相干态相同. 关键词： 原子相干态 薛定谔猫态 角动量压缩 Bloch态     

(sNN)1/2=200 GeV的d+Au碰撞中末态带电粒子赝快度分布的对心度依赖性

将核子-核子碰撞末态带电粒子的生成源分为二元核子 核子碰撞与带头粒子两部分, 给出了末态带电粒子的赝快度分布与入射能量间的解析关系。 以此为基础, 将核 核碰撞末态带电粒子的生成源分为二元核子-核子碰撞、 带头粒子与旁观者3部分, 建立起了以碰撞参数与束流能量为自变量的末态带电粒子的赝快度分布, 并用其分析了BNL-RHIC-PHOBOS合作组在sNN=200 GeV的不同d+Au对心度碰撞中所做的实验测量。 所得结果与实验符合得很好。 We divide the particle generating sources in nucleon-nucleon collisions into two parts: binary collisions and leading particles, and present the analytical relation between charged particle pseudorapidity distributions and incident energy. On the basis of this work, we classify the particle generating sources in nucleus-nucleus collisions into three parts:binary collisions,leading particles and spectators,and formulate the charged particle pseudorapidity distributions as the function of incident energy and impact parameter. We then analyze with the model the experimental measurements in d+Au collisions at sNN=200 GeV. The theoretical results are well consistent with experimental data.     

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：     

关于单模最小关联混态的量子隐性传态及其保真度的研究

基于Braunstein和Kimble方案以双模压缩真空态作为量子信道实施对单模最小关联混态量子隐性传态的可行性进行了研究.我们发现,单模最小关联混态在一定参数范围内呈现出压缩效应这种非经典性质,利用双模压缩真空态作为量子通道可以高保真的传递没有压缩效应的单模最小关联混态,但对呈现压缩效应的单模最小关联混态进行量子隐性传送时得到输出态的保真度较低.而且发现通过调节输出端位移因子的方法不能实现对单模最小关联混态保真度的优化.     

压缩真空态与压缩单光子态的相干叠加态的非经典性质

通过对量子比特态进行压缩操作,获得压缩真空态与压缩单光子态按一定的权重比例叠加而成的相干叠加态,此相干叠加态与压缩参数和权重因子有关,研究其非经典性和非高斯性.研究结果表明,通过压缩使得量子比特态的光子数分布范围变宽了.特别是从亚泊松分布和Wigner函数负定性情况分析了该量子态的非经典属性,从Wigner函数的边缘分布角度观察了该量子态的非高斯性.发现调节权重因子和压缩参数可以改善该态的非经典性和非高斯性.     

Coherent Landau states with gauge invariance

Coherent states for the Landau system (planar charged particle moving in a uniform magnetic field) are developed. It is convenient to use these states to describe the circular motion of the charged particle. The results obtained do not depend on gauges.     

Photon Statistics of the Micromaser with Ultre Cold Λ-Type Three-Level Atoms

Coupled squeezed states for the Landau system (planar charged particle moving in a uniform magnetic field)are built.These coupled squeezed states adn decoupled squeezed Landau states give some information about the circjlar motion of charged particles resprctively.     

A Charged Particle in an Electric Field in the Probability Representation of Quantum Mechanics

The Green's function and linear integrals of motion for a charged particle moving in an electric field are discussed. The Wigner functions and tomograms of the stationary states of the charged particle are obtained. The relationship between the quantum propagators for the Schrödinger evolution equation, the Moyal evolution equation, and the evolution equation in the tomographic-probability representation for a charged particle moving in an electric field is discussed.     

Coherent states of a particle in a magnetic field and the Stieltjes moment problem

A solution to a version of the Stieltjes moment problem is presented. Using this solution, we construct a family of coherent states of a charged particle in a uniform magnetic field. We prove that these states form an overcomplete set that is normalized and resolves the unity. By the help of these coherent states we construct the Fock-Bergmann representation related to the particle quantization. This quantization procedure takes into account a circle topology of the classical motion.     

Positive-definite states of a Klein-Gordon-type particle

A possible way for the consistent probability interpretation of the Klein-Gordon equation is proposed. It is assumed that some states of a scalar charged particle cannot be physically realized. The rest of quantum states are proven to have positive-definite probability distributions.     

Surface states and the charge of a dust particle in a plasma

We investigate electron and ion surface states of a negatively charged dust particle in a gas discharge and identify the charge of the particle with the electron surface density bound in the polarization-induced short-range part of the particle potential. On that scale, ions do not affect the charge. They are trapped in the shallow states of the Coulomb tail of the potential and act only as screening charges. Using orbital-motion limited electron charging fluxes and the particle temperature as an adjustable parameter, we obtain excellent agreement with experimental data.     

Mesoscopic superposition states in relativistic Landau levels

We show that a linear superposition of mesoscopic states in relativistic Landau levels can be built when an external magnetic field couples to a relativistic spin 1/2 charged particle. Under suitable initial conditions, the associated Dirac equation produces unitarily superpositions of coherent states involving the particle orbital quanta in a well-defined mesoscopic regime. We demonstrate that these mesoscopic superpositions have a purely relativistic origin and disappear in the nonrelativistic limit.     

Charge-magnetic-dipole bound states using the Klein-Gordon equation

We investigate bound states of a composite system consisting of a charged particle orbiting a neutral, stationary magnetic dipole. We find all bound states are metastable and none exist with angular momentum less than eleven. Our calculations is performed in two space dimensions.