Compare Quantum Operation Sensitivity for Different Distance Measures

In this paper, we compare the quantum operation sensitivity for different distance measures. We find that, among all usual distance measures, Bures fidelity is more sensitive to quantum operation than others. This may explain in some sense why fidelity is so useful in quantum information theory.     

Study of lower emittance dedicated synchrotron radiation mode for the BEPCⅡ

In this paper,a dedicated synchrotron radiation （SR） mode for the BEPCⅡ with an emittance of 85 nm has been designed,including the linear lattice,chromaticity correction and dynamic aperture optimization.The emittance of the new mode is about 60% of the previous mode used for routine operation of the BEPCⅡ .The effect of wigglers on the linear lattice was compensated and the total dynamic aperture including the wigglers’ nonlinear effect was estimated.The preliminary commissioning at the end of 2008 and the formal operation with the new mode confirmed its merits.     

Control system for the CSNS ion source test stand

A penning plasma surface H- ion source test stand for the CSNS has just been constructed at the IHEP. In order to achieve a safe and reliable system, nearly all devices of the ion source are designed to have the capability of both local and remote operation function. The control system consists of PLCs and EPICS real-time software tools separately serving device control and monitoring, PLC integration and OPI support. This paper summarizes the hardware and software implementation satisfying the requirements of the ion source control system.     

The single-longitudinal-mode operation of a ridge waveguide laser based on two-dimensional photonic crystals

An electrically driven, single-longitudinal-mode GaAs based photonic crystal (PC) ridge waveguide (RWG) laser emitting at around 850 nm is demonstrated. The single-longitudinal-mode lasing characteristic is achieved by introducing the PC to the RWG laser. The triangle PC is etched on both sides of the ridge by photolithography and inductive coupled plasma (ICP) etching. The lasing spectra of the RWG lasers with and without the PC are studied, and the result shows that the PC purifies the longitudinal mode. The power per facet versus current and current-voltage characteristics have also been studied and compared.     

无水三氯化铝催化乙醇脱水反应制乙烯的实验研究

针对浓硫酸或五氧化二磷作催化剂的不足,该研究采用无水三氯化铝催化乙醇制乙烯,可使反应体系在120~130℃左右产生大量乙烯气体。同时从理论上探究了无水三氯化铝催化乙醇脱水的机理,并从教学演示实验的角度改进了反应装置,取得了较好的实验效果。     

利用单光子的量子对话

提出了一个利用一束单光子对话的方案.在方案中,利用两个不同的幺正操作对光子态进行编码,并且从一束光子中选择较大的子集进行窃听检查,该方案能够有效地抵御截取再发送袭击.此外,由于利用单光子没有利用EPR对,因此该方案是很实际的.该方案是绝对安全的.     

化工机械常识(十三)

溶劑提取利用溶劑從固體或液体中將能溶解在溶劑中的物質分开的方法稱为溶劑提取(Solvcnt Extraction),這種基本操作在化學製造工业中應剧極广,现在已紅發展為一個单元操作了。它是使液体溶劑與被提取的物質、固体或液體)接觸,刚最有效的方法将被提取物中的可溶成分提取出來,最著名的青徽素製造,     

介绍一种关于四重映轴S4及四重反轴I4独立性的简洁推导

分子点群与晶体学点群是结构化学教学重要内容之一,同时也是教学的一个难点。学生经常提出“为何只有S₄轴及I₄轴是独立的,而其余映轴及反轴均是非独立的;在描述分子对称性时为何选用映轴,而描述晶体对称性时则选用反轴”等问题。本文从循环群的生成元出发,得到映轴群S_n及反轴群I_n的对称操作群元素。根据映轴是否可以用其他对称元素代替,或对称操作群是否可以表示为两个子群的直积的性质,推导出当n≤6时只有S₄及I₄是独立的结论。这种推导方式避免了图形说明繁琐和抽象,有利于学生从定义推导上理解对称元素的独立性,便于教学中推广。     

多控制者下的双向量子隐形传态

提出了一种多控制者的双向量子隐形传态方案。在该理论方案中有三个控制者协助通信,纠缠资源为最大七粒子纠缠态,其中通信者Alice和Bob以及三个控制者预先秘密共享最大七粒子纠缠态以构建量子信道。三个控制者的参与提高了通信的安全性,同时也避免了执行三粒子联合测量的复杂性。在通信过程中,首先Bob对自己密享的粒子执行酉操作,接着通信方各自对自己手中的粒子执行Bell基测量。假如控制者同意双方通信,便对自己手中的粒子执行单粒子测量并将测量结果通过经典信道传输给通信者。通信方分别结合控制者所公布的测量结果做相应的酉操作,这样便能完美地实现双向量子控制隐形传态。     

某型火控雷达维修训练模拟器设计与应用

为了提高教学效果,减少实装损耗,加强新装备保障能力,研制某型火控雷达维修训练模拟器;该模拟器以网络化主控计算机单元为核心,由实装操作分系统、虚拟装备分系统、实装部组件分系统、动感分系统、联动分系统组成,具有操作训练、维修训练、武器系统联动训练及训练评估等功能,解决了新型雷达装备教学与训练中实装损耗大、装备数量少、训练效率低等问题;该模拟器已用于多个雷达专业的操作、维修、综合演练等教学实践中,与以往的训练设备相比可操作性好,应用范围广,教学效果明显;文中介绍了模拟器的功能结构、硬件设计、软件设计及其应用。