任意四粒子|χ>态和五粒子Brown态的联合远程制备

通过置换群和巧妙构造测量基,给出了以GHZ型态为信道三方确定性地联合地制备四粒子|χ>态和五粒子Brown态的两个协议,并将两个发送者的情况推广到多个发送者的情形,提高了已有方案的概率而不需添加额外局域操作。     

多方分层远程态制备

提出一个以多粒子纠缠图态为量子信道的任意单量子态的多方分层远程态制备（MHRSP）的新协议。在该方案中;利用前馈测量策略;发送者将一个秘密量子态不对称地分配给两级代理;其中两级代理的人数原则上是可以任意的;并且不同级别的代理具有恢复发送者秘密的不同权限。进一步地;将上述MHRSP协议进行了推广;得到一个多方分层联合远程态制备（MHJRSP）方案。所提出的两个方案不涉及非局域操作;它们是安全而不被窃听的;期望能在现实世界中得到有效的应用。     

受控循环远程态制备

为了解决多方量子通信问题,首先提出一种构造十粒子纠缠态的方法,并籍此构造出一个3n+1粒子纠缠态。其次,以十粒子纠缠态为量子信道,提出一个三方受控循环远程制备协议。该协议在监察者David的控制下,Alice能为Bob远程制备一个任意单粒子态,Bob能够在Charlie处远程制备一个任意单粒子态,Charlie也能为Alice远程制备任意单粒子态。进一步,借助3n+1粒子纠缠态,将此循环协议推广到任意n方受控循环远程态制备情形。在远程态制备过程中,每个发送者充分利用各自掌握的信息和前馈策略来构造恰当的测量基,通过经典通信和局域操作,就能成功实现任意单粒子态的远程制备。     

任意二粒子纠缠态的受控量子通信

为了解决任意二量子通信问题,首先给出了五粒子和七粒子纠缠态的构造方法,并提供了它们的量子线路图。其次,以该五粒子纠缠态为量子信道,提出一个任意二粒子未知量子态的受控隐形传态协议。该协议在监察者Charlie的控制下,Alice进行四粒子投影测量和经典通信,Bob采用简单酉变换就能以100%的概率成功重构一个任意二粒子纠缠态。最后,利用七粒子纠缠态为量子信道,提出了任意二粒子纠缠态的联合受控远程制备方案。在此方案中,发送者Alice用自己掌握被制备态的部分信息构造测量基,发送者Bob采用前馈测量策略,接收者Diana在监控者Charlie的帮助下,通过简单幺正变换就能确定性地恢复原始态。     

以真六量子纠缠态为信道的双向受控远程态制备

研究了真六量子比特纠缠态在双向量子受控远程态制备中的一个新应用。在协议中,远程的两方在遥远的第三方控制下,能够同时地、确定地交换他们的量子态。如果没有控制者的允许,这种交换是不能成功的,而作为原始的非局域量子资源的一个真六量子比特纠缠态是预先被三方共享的。     

基于广播机制的多方量子远程制备协议

量子态远程制备(RSP)是量子信息过程的一个重要分支。为了解决一个发送者向多个接收者同时制备相同量子态的问题,提出了基于广播机制的1对2三方量子态远程制备协议,并将其拓展到1对N多方量子态远程制备中。该协议使用GHZ态作为量子信道,通过构造两组特殊测量基,发送方进行两次多粒子投影测量,接收方根据测量结果进行幺正操作,最终实现1个发送者向多个接收者同时制备相同的粒子态。经分析,协议的这种广播制备模式可以适用于任意多个接收者的情形。     

基于联合概率数据关联和粒子滤波的多目标跟踪算法

数据关联一直是多目标跟踪中的核心问题,是实现多目标有效跟踪的关键。介绍了多目标跟踪的基本原理以及联合概率数据关联的基本原理,并且将粒子滤波引入到联合概率数据关联模型中,提出了联合概率数据关联-粒子滤波算法来实现多目标跟踪。仿真结果表明,此算法可以很好的实现固定数目多目标跟踪。     

基于四粒子W态的量子密钥分配协议

量子的纠缠特性可以有效并且安全地应用于量子秘钥分配协议。提出一个基于四粒子W态的密钥分配协议。利用量子W态在量子比特丢失后拥有较强鲁棒性的特点,通过使用不同的测量基把检测信道和生成密钥的粒子区分开来,经贝尔测量和与运算使通信双方生成一致的密钥。除了用于信道检测的粒子外,其余的粒子都参与了最后密钥的生成,使得粒子的利用率较高。最后,对提出的四粒子W态的密钥分配协议的安全性进行了分析。     

基于d维多粒子纠缠态的(t,n)门限量子秘密共享

为了突破Hilbert空间2维度的局限性,解决秘密重建过程中部分参与者缺席的问题,使用d维多粒子纠缠态,提出了一个(t,n)门限量子秘密共享方案。秘密分发者制备n个d维2粒子纠缠对,将第2个粒子分别分发给n个参与者。当秘密分发者选择自己手中t个粒子进行联合投影测量时,纠缠交换使得参与者手中的对应t个粒子坍塌成一个t粒子纠缠态。这t个参与者通过QFT变换和Pauli运算将份额加入t粒子纠缠态。最终,共享的秘密由这t个参与者一起合作恢复。安全性分析表明,该方案能抵抗截获-测量-重发攻击、纠缠-测量攻击、合谋攻击和伪造攻击。     

分层远程量子态制备

提出了研究分层远程态制备（HRSP）的一般方法;系统地证明了分别以4粒子[Ω]态和4粒子团簇态作为量子信道的HRSP都是可能实现的。随后;将所提出的HRSP方案推广到研究分层联合远程态制备（HJRSP）的一般方法;并指出以5粒子团簇态为量子信道的HJRSP协议是可行的。此外;将HJRSP方案修改成概率HJRSP方案;并以5粒子非最大纠缠团簇态为量子信道证实其可能性。     

受控双向远程量子控制

融合远程量子控制与双向受控隐形传态的思想,率先提出了受控双向远程控制(CBRQC)的一个概念.利用五量子纠缠,提出执行任意单量子算子对的两个CBRQC方案.这两个方案是概率的,而在第一个方案中,增加局域Pauli算子将导致该方案成功概率和内在效率都翻倍.对于双向传送算子的限制集,两个确定的方案被提出,其中一个总体优于其...     

多跳远程量子态制备

多跳远程量子态制备在量子无线网络、长距离量子信息传输中有重要价值。融合多跳隐形传态和远程态制备的思想;提出一个多跳远程任意单量子态制备协议。在每一跳中都以三粒子非最大纠缠GHz态为量子信道;利用远程态制备方法;原始单量子态通过中间节点逐跳被制备;每跳恢复的态被用着下一跳被制备的态。通过对单跳和两跳制备的分析;获得了[n]跳制备后方案成功的概率。在协议中;仅涉及到Pauli算子、单粒子测量和前馈策略;因此该方案易于物理实现。     

Towards an integrated measurement of IS project performance: The project performance scorecard

Determining the contribution of information system (IS) projects is a difficult endeavour. This research presents a framework for evaluating and measuring IS project performance that seek to address this problem while moving away from the reliance on the traditional assessment method (time, cost, specifications). When IS projects fail or succeed is difficult to determine what conditions enabled the outcome. However, if we are to develop a higher level of IS project management competence we need frameworks that can help in assessing IS project outcomes while critically reflecting and learning from IS project management practices. The Project Performance Scorecard (PPS) recommended here is one framework that can help to advance our understanding IS project management and evaluation approaches. This framework integrates concepts from existing models of IS success, the Balanced Scorecard and project management practices. A case study approach is used to illustrate the use of the PPS, and offers insights into how it can be useful in assessing the performance of IS projects.

Prioritizing and Assessing Software Project Success Factors and Project Characteristics using Subjective Data

This paper presents a method for analyzing the impact software project factors have on project success as defined by project success factors that have been prioritized. It is relatively easy to collect measures of project attributes subjectively (i.e., based on expert judgment). Often Likert scales are used for that purpose. It is much harder to identify whether and how a large number of such ranked project factors influence project success, and to prioritize their influence on project success. At the same time, it is desirable to use the knowledge of project personnel effectively. Given a prioritization of project goals, it is shown how some key project characteristics can be related to project success. The method is applied in a case study consisting of 46 projects. For each project, six success factors and 27 project attributes were measured. Successful projects show common characteristics. Using this knowledge can lead to better control and software project management and to an increased likelihood of project success.     

Work and fatigue characteristics of unsuited and suited humans during isolated isokinetic joint motions

The effects of a pressurized suit on human performance were investigated. The suit is known as an Extra-Vehicular Mobility Unit (EMU) and is worn by astronauts while working outside their spacecraft in a low earth orbit. Isolated isokinetic joint torques of three female and three male subjects (all experienced users of the suit in 1G gravity) were measured while working at 100% and 80% of their maximum voluntary torque (MVT, which is synonymous with maximum voluntary contraction (MVC)). It was found that the average decrease in the total amount of work (the sum of the work in each repetition until fatigue) done when the subjects were wearing the EMU were 48% and 41% while working at 100% and 80% MVT, respectively. There is a clear relationship between the MVT and the time and amount of work done until fatigue. Here, the time to fatigue is defined as the ending time of the repetition for which the computed work done during that repetition dropped below 50% of the work done during the first repetition. In general the stronger joints took longer to fatigue and did more work than the weaker joints. It was found that the EMU decreases the work output at the wrist and shoulder joints the most, due to the EMU joint geometry. The EMU also decreased the joint range of motion. The average total amount of work done by the test subjects increased by 5.2% (20.4%) for the unsuited (suited) case, when the test subjects decreased the level of effort from 100% to 80% MVT. Also, the average time to fatigue increased by 9.2% (25.6%) for the unsuited (suited) case, when the test subjects decreased the level of effort from 100% to 80% MVT. It was also found that the experimentally measured torque decay could be predicted by a logarithmic equation. The absolute average errors in the predictions were found to be 18.3% and 18.9% for the unsuited and suited subjects, respectively, when working at 100% MVT, and 22.5% and 18.8% for the unsuited and suited subjects, respectively, when working at 80% MVT. These results could be very useful in the design of future EMU suits and the planning of Extra-Vehicular Activity (EVA) for the future International Space Station assembly operations.     

Motivating developer performance to improve project outcomes in a high maturity organization

In this paper we discuss the impact software developer performance has on project outcomes. Project performance remains unreliable in the software industry with many compromised software systems reported in the press. We investigate the impact that developer performance has on aspects of project success and explore how developer performance is motivated. We present interview, focus group and questionnaire data collected from a team of developers working in a software organization that has been assessed at CMM level 5. Our main findings are that developers value technical skills in their colleagues, but appreciate these especially when supplemented with good human skills. Software developers with a proactive, flexible, adaptable approach who are prepared to share knowledge and follow good practice are said to be the best developers. Motivators for these developers are pay and benefits, recognition and opportunities for achievement in their work. Overall, we found that technical competence, interpersonal skills and adherence to good practices are thought to have the biggest impact on software project success.