The relationship of cut - angle and the degree between pump beam and signal beam in bbo crystal pumped by 425nm pulse is theoretically calculated . 28 . 7 cut - angle bbo crystal is chose for our use , which correspond to a 5 angle between pump beam and signal beam 在中心波长425nm飞秒脉冲抽运、下转换光频率简并的情况下，选择晶体的切割角为28 . 7度，对应下转换光与抽运光在晶体外夹角为5度。
Experimental results of four - photon de broglie wavelength measurement are analyzed based on a local description for the quantum state and optical field of photon pairs generated from spontaneous parametric down - conversion ( spdc ) 摘要采用对自发参量下转换过程产生的光子对的量子态和光场的非纠缠态描述，分析了由自发参量下转换过程产生的四光子的德布罗意波长测量的实验，得到了与实验观测相一致的结果。
Through searching a nonlinear state feedback , the method makes the nonlinear system to be transformed to a linear system which is completely controllable . thus we can analyze the system using the mature theory of linear system 这种方法通过寻求一个非线性状态反馈，使得原非线性系统在选定的坐标变换下转换为一个完全可控的线性系统，这样我们就可以采用非常成熟的线性系统理论对系统进行分析和综合了。
There are many ways to generate single - photon state , e . g . attenuated laser , quantum dot , pulsed excitation of a single dipole , single nitrogen - vacancy color center in a diamond nanocrystal , cavity - qed and spontaneous parametric down - conversion ( spdc ) 目前有多种方案可以制备单光子态，如直接将激光衰减至单光子水平、量子点、单荧光分子以及金刚石纳米颗粒中的n - v色心、腔qed及自发参量下转换等。
In order to get single - photon state and reconstruct its wigner function , the two aspects , spdc of pulse pumped nonlinear phase match type i bbo crystal and reconstruction of wigner function of quantum state , are studied in this thesis . 1 本文是单光子态制备及其wigner函数重构课题中的部分内容，主要包括两个方面内容，即脉冲抽运的类非共线相位匹配bbo晶体的自发参量下转换过程和利用量子层析摄影术重构光量子态的wigner函数。
In this thesis we discuss these three aspects in detail and our main research work is outlined as follows : in section 2 we first give a definition of entanglement and illustrate some distinctive qualities of entangled states , then explain how to describe entanglement of multi - particle quantum state . in section 3 we show many existing different schemes for preparation of entangled states by spontaneous parametric down conversation , cavity quantum electrodynamics and iron traps , moreover we present new schemes to prepare multi - atom entangled states as well as multi - cavity entangled states 在第二章中我们将给出纠缠态的定义和度量，研究纠缠态的一些特性，第三章中我们将系统介绍目前理论上利用自发参量下转换，通过腔量子电动力学和离子阱制备纠缠态的各种方案，以及在实验上的进展，并在论文中重点提出了利用原子和腔场相互作用来制备多原子纠缠态和多腔场纠缠态的方案。
In this paper , three - tower building with name of oriental tunes square in xiamen is analyzed by the international current program sap2000 , considering seismic action in two directions . by structural modeling and calculation , the characteristic of vibration of the multi - tower structure is analyzed , the influences of the rigid ratio of the enlarged base to top tower and translation - torsion coupled effects among several towers are investigated , the inter - story displacement , displacement of the top tower and deformation of tower ' s base floor in x and y major orientation under earthquake action are contrasted with those under wind load . at last , the distributing characteristics of stress of transfer plate and of the normal , shearing stress of mostly vertical elements under earthquake action are studied 本文以具有3个塔楼的厦门东方时代广场为分析对象，采用国际通用有限元分析软件sap2000进行结构建模和分析，考虑双向地震动输入，研究结构的振动特性，分析底盘与塔楼刚度比对结构的影响以及多塔之间的扭转效应和平扭耦联作用，对比风荷载和地震作用下塔楼在两个结构主轴方向的层间位移、顶点位移以及塔楼底层的变形，分析地震作用下转换层楼板的应力分布特点及主要竖向构件的正应力和剪应力分布特点。
After compurgation these thinking from the west and the east , we will find there are many sameness and difference between them . chapter focuses on analyzing the environment of chinese public department human resource management and development in the contemporary era , pointing out the shortcomings in practice , furthermore , it argued the civil servant system in china 文章的第二部分分析了当代中国公共部门人力资源的管理与开发环境，从政府在市场经济条件下转换职能的角度，评价了当前我国公共部门人力资源管理与开发的现状，在此基础上，进一步分析了我国公务员制度中的激励问题，指出目前激励的应用现状及存在的不足。
In this thesis the main work finished by author is in followings : firstly , in order to understand the influence of transfer girders at different heights on behaviors of frame structures under static loads , some examples were analyzed and were compared . the results indicate that compared with ordinary frame , the inner forces of the structures under the transfer girders doubly increase , while the increases of inner forces above transfer girders are smaller 本文对高位转换框支框架结构的受力性能进行了研究,完成的主要工作有: 1 .为了了解静力荷载下转换层设置位置对结构受力性能的影响,对高层框架结构在不同高度设置梁式转换层时的受力及位移特点进行研究。
4 ) the tuning characteristics of doubly - resonant optical parametric oscillator propo ) output by changing crystal ' s temperature , opo ' s cavity length and pump frequency respectively are theoretically analyzed and experimental obtained the wavelength of the opo output can be tuned from 2038nm to 2227nm by the crystal ' s temperature changed of 5 . 3 , from 2044nm to 2219nm by the cavity length changed of 514nm , and 375mhz by the pump frequency continuously tuned 750mhz 当晶体温度变化5 . 3时，得到2038nm - 2227nm可调谐下转换光输出；当opo的腔长相对于简并点腔长变化514nm时，得到2044nm - 2219nm可调谐下转换光输出：当泵浦光频率连续的改变了750mhz时，下转换光的频率相应连续调谐375mhz 。理论拟合与实验结果基本一致。
