Dicke超辐射系统多光子过程中光场的压缩效应

本文利用微扰技术研究了与Ｄｉｃｋｅ模型中Ｎ个两能级原子系统通过多光子过程相互作用的相干态场的时间演化．研究表明，若多光子Ｄｉｃｋｅ模型中的Ｎ个两能级原子初始时皆处于去激发状态，则在短时近似下光场可存在二阶压缩效应．     

曲线坐标下的动量算符和动能算符

本文从量子力学算符必须满足厄密性这一基本原理出发，导出了曲线坐标下的动量算符的普适形式　，得到了球坐标及柱坐标等曲线坐标中的动量算符的正确形式，又根据量子力学中的动能算符应是微分算符这一特点，导出了曲线坐标下动能算符的普适形式．     

两偶极相互作用原子系统中的偶极平方压缩

研究了两个存在偶极相互作用的原子系统中的偶极平方压缩效应,讨论了原子偶极相互作用以及相位信息对压缩效应的影响,并进而探讨了原子偶极平方压缩与光场振幅平方压缩之间的关联.     

Reduced quantum fluctuation in mesoscopic Josephson junction with nonclassical radiation field at finite temperature

We have investigated the reduced fluctuation properties in a mesoscopic Josephson junction with the squeezed state at a finite temperature. It is shown that the fluctuations increase with increasing temperature and the mesoscopic Josephson junction subsystem can exhibit squeezing behaviour at an appropriately low temperature.     

Teleportation of N-particlstate via entanglemente entangled W swapping

A scheme for teleporting an unknown N-particle entangled W state is proposed via entanglement swapping. In this scheme, N maximally entangled particle pairs are used as quantum channel. As a special case, the teleportation of an unknown four-particle entangled W state is studied.     

Schemes for Teleportation of an Unknown Single-Qubit Quantum State by Using an Arbitrary High-Dimensional Entangled State

We propose a scheme to teleport an unknown single-qubit state by using a high-dimensional entangled state as the quantum channel. As a special case, a scheme for teleportation of an unknown single-qubit state via three-dimensional entangled state is investigated in detail. Also, this scheme can be directly generalized to an unknown f-dimensional state by using a d-dimensional entangled state （d〉f） as the quantum channel.     

利用扫描激光器的直径测量装置

<正> 日本Anritsu 公司研制出一种KL506A 扫描激光束直径测量系统,该系统能测量各类圆形产品,如光导纤维的外径。将一束激光对准一面镜子照射,镜子固定在一个谐振叉形转向器的顶端,并将激光束反射。当激光束     

关于制冷循环的讨论

本文讨论了应如何理解非卡诺制冷 循环中的低温热源的问题，指出致冷系数表达 式中的Ｑ２应是工作物质在制冷循环中从“有 效冷库”吸取的热量．     

零知识证明的量子身份认证协议

零知识证明的量子身份认证是由一个绝对公正的第三方CA主持的协议.协议的实现是基于远程态制备，量子辅助克隆的量子操控手段.在认证过程中，只有CA知道量子身份证的信息，认证参与方Alice和Bob在不知道量子身份证的信息的基础上可完成认证工作.提出了如何提高认证成功概率的方法.协议由量子力学原理保证，有绝对的安全性. 关键词： 量子身份认证 零知识证明 远程态制备 量子态辅助克隆     

Scheme for probabilistic remotely preparing a multi-particle entangled GHZ state

This paper presents a scheme for probabilistic remote preparation of a three-particle entangled Greenberger-Horne-Zeilinger （GHZ） state via three-particle orthonormal basis projective measurement, and then directly generalize the scheme to multi-particle case. It is shown that by using N pairs of bipartite non-maximally entangled states as the quantum channel and N-particle orthonormal basis projective measurement, the multi-particle remote preparation can be successfully realized with a certain probability.