普通物理实验教学改革的几点建议

普通物理实验教学是大学物理教学的重要组成部分。针对普通物理实验教学的现状,就其相关的教学内容、教学方法、师资队伍建设、实验室建设和管理等存在的问题,提出相应的解决思路。     

Symmetry and size effects on energy and entanglement of an exciton in coupled quantum dots

We study theoretically the essential properties of an exciton in vertically coupled Gaussian quantum dots in the presence of an external magnetic field. The ground state energy of a heavy-hole exciton is split into four energy levels due to the Zeeman effect. For the symmetrical system, the entanglement entropy of the exciton state can reach a value of 1. However, for a system with broken symmetry, it is close to zero. Our results are in good agreement with previous studies.     

讲好量子力学绪论课从Planck公式推证开始

从量子力学绪论课的开端——黑体辐射入手,在普朗克能量量子化假说,引入普朗克常数基础上,结合完善的热力学统计物理学理论,对Planck辐射公式进行了简单、清晰的推证.拨开迷雾,从源头开始,阐明Planck辐射定律及其物理背景,使学生明白量子论的产生不是凭空的,是解决经典物理学中所存在的矛盾的必然性结果,从而能够帮助学生更好地理解量子力学,使得量子力学及相关课程教学效果得到很好的提升.     

Entanglement evolution of three-qubit mixed states in multipartite cavity—reservoir systems

We analyze the multipartite entanglement evolution of three-qubit mixed states composed of a GHZ state and a W state.For a composite system consisting of three cavities interacting with independent reservoirs,it is shown that the entanglement evolution is restricted by a set of monogamy relations.Furthermore,as quantified by the negativity,the entanglement dynamical property of the mixed entangled state of cavity photons is investigated.It is found that the three cavity photons can exhibit the phenomenon of entanglement sudden death(ESD).However,compared with the evolution of a generalized three-qubit GHZ state which has the equal initial entanglement,the ESD time of mixed states is later than that of the pure state.Finally,we discuss the entanglement distribution in the multipartite system,and point out the intrinsic relation between the ESD of cavity photons and the entanglement sudden birth of reservoirs.     

自动化设备控制和数据采集软件LabMeasure

LabMeasure软件使用高级语言进行脚本编程,并具有程序调试功能.软件通过相应函数提供程序运行结果显示和数据保存功能,通过功能函数库提供各种功能扩展.软件预置了对多种通讯协议的支持,可以容易地同各种具有通讯功能的设备进行通讯.使用该软件能够地方便在实验室中搭建各种自动化控制和数据采集系统.