应用物理学专业光电信息技术方向建设的研究

阐述了长沙大学应用物理学专业光电信息技术方向建设的重要性，分析了专业现状，提出了专业实验室建设，课程与教材建设的目标，介绍了专业培养目标，专业特色，专业课程，教学实践的设置以及教学进程安排。     

正、负电子贮存环与其入射器加速频率的关系

本文分析了e^－e⁺电子贮存环与其入射器加速频率是否要成整数倍关系的问题. 特别在近年来, 次谐波聚束器提出以后, 这个问题更为突出. 文中对此问题从几方面来进行讨论, 最后提出了两个新的建议, 使两者频率可以不保持整数倍关系, 但又具有频率成整数倍时的优点.     

三粒子纠缠Ｗ态的隐形传态

提出利用三个二粒子纠缠态作为量子信道，实现三粒子纠缠Ｗ态的隐形传态的方案.首先考察量子信道是最大纠缠态的情形，然后进一步考察量子信道是非最大纠缠态的情形.发现在量子信道为非最大纠缠态时，通过引进一个辅助粒子，并构造一个幺正变换矩阵，即可以一定的概率完成三粒子纠缠Ｗ态的隐形传态. 关键词： 隐形传态 三粒子纠缠 纠缠Ｗ态 非最大纠缠量子信道     

Improving the fidelity of continuous-variable quantum teleportation by tuning displacement gain

The fidelity of teleportation of continuous quantum variables can be improved by tuning the local displacement gain. We investigate the optimization of the fidelity for the teleportation of Schrodinger cat states, and of coherent states. It is found that the gain corresponding to the maximum fidelity is not equal to one for the two input states in the case of the small squeezing degree of the entanglement resource, while unity displacement gain is the best choice for teleporting arbitrary quantum states in the case of large squeezing.     

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为进一步提高HL-2A装置的放电参数和优化等离子体位形，给出了三种可能的主机改造途径：保留真空室，去掉并调整真空室内部分多极场线圈的局部改造方案；保留真空室，重新布局极向场线圈的中等规模改造方案；重新设计真空室和极向场线圈系统的大规模改造方案。对三种改造方案对放电参数和位形的影响和改造工程的可行性进行了分析比较，重新设计真空室和极向场线圈系统的大规模改造方案是最佳选择。     

5-(4-吡啶基-1,3,4-(口恶)二唑-2-硫酮的合成和谱学研究

5-(4-吡啶基)-1,3,4-(口恶)唑-2-硫酮(C7H5N3OS)是异烟肼与二硫化碳发生加成闭环反应时获得.文章初步讨论了反应历程,提出该反应的机理是亲核加成,并通过IR谱和NMR谱对标题化合物的结构进行了表征,热稳定性测试表明:该化合物在506℃时完全分解.     

Analyses of edge plasma characteristics in HL-2A

The edge plasma characteristics are studied by both a movable array of Mach/Reynolds stress/Langmuir 10-probes in the boundary region and the fixed flush probe arrays on the 4 divertor neutralization plates at the same toroidal cross-section in the HL-2A tokamak. The dependence of the Reynolds stress on poloidal flow in the edge plasma is analysed. The result indicates that the sheared poloidal flow in tokamak plasma can be induced by the radial gradient of Reynolds stress. In the divertor experiments of HL-2A, the profiles of the electron temperature, density and floating potential on divertor plates are measured by the flush probe arrays. The edge electron temperature in divertor configuration is higher than that in limiter configuration. The temperature asymmetry between outer and inner target plates is observed. The result of magnetic surface reconstructed from 18 Mirnov coils signals is presented. Both the particle recycling and the impurity flux in the bulk plasma during divertor discharges are discussed. Neutral gas pressure in divertor chamber, measured by fast ionization gauge during divertor discharge, is given.     

Locality Violation with Spin-Type W States without Using Inequalities

Using even and odd coherent states, we define a new state, which is called the spin-type W state. With the spin-type W states, we provide a new scheme for testing fundamental aspects of quantum mechanics and refuting local hidden variable theory without using inequalities. Finally, a scheme for preparing the spin-type W states, and discussion of experimental possibility and the effect of the measurement on physical observables due to a close orthogonality of the two coherent states are given.     

超导单光子探测技术

单光子探测是弱光测量技术的核心,在量子信息、物理、生物、化学和天文学领域具有关键性的作用。传统以光电倍增管或雪崩二极管为基础的单光子探测器的低灵敏度和高暗计数限制了信噪比的提高,低计数率限制了测量速度和动态范围。本文综述了以超导材料作为光敏感器件的单光子探测技术,其量子效率、暗计数率和计数率远高于传统的单光子探测器,它们的出现势必给单光子测量相关学科带来巨大影响。