The de Haas—van Alphen Oscillation in Two—Dimensional QED at Finite Temperature and Density

The de Haas-van Alphen oscillations in two-dimensional QED at finite temperature and density are investigated.It is shown that for a given particel density,besides the oscillation of magnetization,the chemical potential is also oscillating with the same period.Different from the earloier work (J.O.Andersen and T.Haugset,Phys.Rev.D51 (1995) 3073),the magnetization oscillations we studied have a correct nonrelativistic limit at zero temperature.     

微机构可调谐阵列滤光片的设计与模型分析

提出一种新颖的采用薄膜技术在玻璃基底上构造微机可调谐二维窄带滤光片阵列的方法,对器件进行了膜系设计及光谱响应模拟,通过器件的电动力学模型分析,设计出器件的形状与尺寸。     

Teleportation of a two-atom entangled state using a single EPR pair in cavity QED

We propose a scheme for teleporting a two-atom entangled state in cavity quantum electrodynamics (QED). In the scheme, we choose a single Einstein--Podolsky--Rosen (EPR) pair as the quantum channel which is shared by the sender and the receiver. By using the atom--cavity-field interaction and introducing an additional atom, we can teleport the two-atom entangled state successfully with a probability of 1.0. Moreover, we show that the scheme is insensitive to cavity decay and thermal field.     

Protocol for multi-party superdense coding by using multi-atom in cavity QED

We present a protocol for multi-party superdense coding by using multi-atom in cavity quantum electrodynamics (QED). It is shown that, with a highly detuned cavity mode and a strong driving field, the protocol is insensitive to both cavity decay and thermal field. It is even certain to identify GHZ states via detecting the atomic states. Therefore we can realize the quantum dense coding in a simple way in the multiparty system.     

Quantum Nonlocality and Generation of Multi-mode Schrodinger Cat States

We describe the Greenberger-Horne-Zeilinger (GHZ) paradox in the multi-mode Schroedinger cat states.We also show that the multi-mode cat states violate the Bell‘s inequality by an amount that grows exponentially with number of modes. The test of quantum nonlocality is based on parity measurement and displacement operation, which are experimentally feasible. We also describe a scheme for the generation of the cat states in cavity QED.     

Real-Time Thermal Ward-Takahashi Identity for Vectorial Current in QED and QCD

It is shown that by means of canonical operator approach the Ward-Takahashi identity (WTI) at finite temperature T and finite chemical potential μ for complete vectorial vertex and complete fermion propagator can be simply proven, rigorously for Quantum Electrodynamics, and approximately for Quantum Chromodynamics, where the ghost effect in the fermion sector is neglected. The WTI shown in the real-time thermal matrix form will give definite thermal constraints on the imaginary part of inverse complete Feynman propagator including self-energy for fermion and will play an important role in relevant physical processes. When the above inverse propagator is assumed to be real, the thermal WTI will essentially be reduced to its form at T=μ=0 thus one can use it in the latter‘s form. At this point, a practical example is indicated.     

Generation of Multi-atom Entanglement of Greenberger-Horne-Zeilinger and W States in Cavity QED

A method to prepare multi-particle entanglement of Greenberger-Horne-Zeilinger-type and W-type is proposed through the interaction between the cavity and many atoms simultaneously . After suitable interaction, the selected measurements on the cavity field can create the entangled atomic states. These entangled states can be useful for quantum information manipulation and fundamental study of quantum theory. These states that violate the Bell‘s inequality are proven.     

最杰出的10位物理学家

 英国杂志《物理世界》在100位著名物理学家中选出的10位最伟大者:爱因斯坦,美籍德国物理学家。苏黎世大学哲学博士,英国皇家学会会员。建立相对论改变了世人的宇宙观。他因解释光电效应的理论,独获1921年诺贝尔物理学奖。牛顿,英国物理学家、数学家与天文学家。创立牛顿运动定律和发现万有引力定律。1666年用三棱镜分析日光,发现白光由不同颜色的光构成。1671年研制反射望远镜观察行星运动规律。解释潮汐现象,预言地球不是正球体。麦克斯韦,英国物理学家、数学家,英国皇家学会会员。他建立电磁场的基本方程,指出光的本质是电磁波。玻尔,丹麦物理学家。量子力学创始人之一。     

1999年诺贝尔物理奖

 根据瑞典皇家科学院１０月１２日发布的消息,瑞典皇家科学院已决定把１９９９年度的诺贝尔物理奖授予两位荷兰科学家赫拉尔杜斯·霍夫特（Ｇｅｒａｒｄｕｓ’ｔＨｏｏｆｔ）和马丁努斯·韦尔特曼（ＭａｒｔｉｎｕｓＪ．Ｇ．Ｖｅｌｔｍａｎ）。这两位研究者是由于他们为粒子物理理论提供了更加坚实的数学基础而获奖的,尤其是揭示了用他们的理论如何精确计算物理量．欧洲和美国的粒子加速器近来进行的实验已经证实了他们的许多计算结果．数学基础更加坚实的粒子物理理论我们周围的一切物体都由原子构成,而原子又由电子和原子核组成．在原子核中有质子和中子,它们又都由夸克组成．为了研究夸克这一最深层次的情况,需要有大型加速器     

胶束电动力学毛细管色谱中有机调节剂对溶质容量因子的影响

将质量作用定律应用于胶束电动力学毛细管色谱中溶质、有机添加剂和胶束之间的相互作用研究,得到了溶质容是因子与各过程平衡常数及有机添加剂、表面活性剂浓度的关系的数学表达式。进一步分析表明,研究调节剂在胶束中可能有一定的溶解度,但这一过程对于胶束在电泳过程中的迁移速度几乎没有影响;有机添加剂对溶质容量因子的影响主要反映为其对表面活性剂临界胶束浓度的影响,在一级调节剂浓度不变的情况下,溶质容基因子与表面活性剂浓度之间满足很好的线性关系。