一类非线性时滞系统的鲁棒故障诊断

讨论了一类非线性时滞系统执行器故障的鲁棒故障诊断问题.通过引入一种适当的坐标变换,将一类非线性时滞系统转化为两个低维子系统,研究与非线性项无关子系统的基于状态观测器的鲁棒故障诊断系统设计问题,借助线性矩阵不等式(LMI)技术,推导出依赖时滞大小的解存在的条件以及观测器增益矩阵的求解方法.仿真算例验证了该方法的有效性.     

对称组合系统的鲁棒输出调节

研究了对称组合系统的鲁棒输出调节问题。结果表明，对称组合系统的鲁棒输出调整问题可以转化为两个修正的低阶子系统的鲁棒输出调节问题。并可通过考察两个低阶矩阵行的线性相关性得到解决。     

考虑数据噪声的鲁棒回归建模方法综述

在开放环境下,数据中包含很多不确定性,如数据噪声等,这给传统的机器学习方法带来了巨大的挑战。该文综述了当前考虑数据噪声的鲁棒回归建模方法,具体可分为两大类:基于数据预处理的鲁棒回归建模方法和基于鲁棒策略的鲁棒回归建模方法。前者根据数据预处理方法的不同又分为基于异常点检测和基于信号处理的鲁棒回归建模方法。后者所采用的鲁棒策略主要有3种:加权函数、鲁棒损失函数以及噪声分布先验。文中详细地描述了鲁棒回归建模各个方向的研究工作,并对比了两类鲁棒回归建模方法的优劣。最后,根据当前鲁棒回归建模存在的一些问题,也提出了构建鲁棒模型的几种可行的策略。     

区间系统鲁棒稳定性和鲁棒镇定性的检验条件

讨论了区间系统的鲁棒稳定性和鲁棒镇定性的有限检验问题，给出了线段多项式鲁棒稳定性的充分必要条件，利用该条件对多项式多面体鲁棒稳定性和区间系统鲁棒镇定性进行了有限检验，并给出了相应的检验结果。该检验条件直观简明，利用它可非常方便地对这些区间系统进行鲁棒稳定性分析。     

采用反馈的鲁棒系统设计方法

基于多变量系统鲁棒理论和反馈可以减小对象参数变化对输出影响的思想，本提出一种鲁棒系统设计方法和设计内反馈增益矩阵的算法。用该方法对一实际工业对象设计了鲁棒控制系统，结果令人满意。理论分析和实际系统设计结果表明，该方法设计的系统比串联补偿鲁棒设计的系统具有更好的鲁棒稳定性和鲁棒性能。     

区间系统鲁棒稳定性和鲁棒镇定性的检验条件

讨论了区间系统的鲁棒稳定性和鲁棒镇定性的有限检验问题,给出了线段多项式鲁棒稳定性的充分必要条件,利用该条件对多项式多面体鲁棒稳定性和区间系统鲁棒镇定性进行了有限检验,并给出了相应的检验结果。该检验条件直观简明,利用它可非常方便地对这些区间系统进行鲁棒稳定性分析。     

无限维两体量子系统态的一些纠缠判据

探讨了无限维两体复合量子系统态的可分性问题,利用局域不确定性关系提出了无限维两体量子态可分的一些必要条件,得到了可分态所满足的一些不等式,推广了作者Otfried Guhne（PhysRev Lett,2004）和Zhang Chengjie（Phys Rev A,2010）的有限维的相关结果,对于识别无限维量子系统态的可分性是一个补充。     

区间矩阵的鲁棒稳定性分析

本文通过对不确定结构作对角规范化处理,利用行列式的特殊性质,得到了新的鲁棒稳定判据.在对角化基础上,求取一个多维方体各顶点所对应的行列式值,由此构成一个凸多边形,从判别该凸多边形是否包含原点来判别区间矩阵的稳定性.这种方法的保守性可通过将多维方体逐步划分成小块而得到无限降低.     

线性时滞奇异系统的时滞相关鲁棒稳定性与鲁棒镇定条件

讨论了线性时滞奇异系统的时滞相关鲁棒稳定性与鲁棒可镇定性问题.首先,利用LyapunovKrasovskii泛函方法.通过建立一个积分不等式和引入"0"矩阵.得到一个时滞相关鲁棒稳定条件;其次,根据该鲁棒稳定性条件.给出对状态反馈后的闭环系统正则、无脉冲、稳定的鲁棒镇定控制器设计方法;最后,通过数值仿真例子验证了所提出方法的可行性.     

动态预补偿器实现鲁棒对角优势

给出一种多变量参数不确定系统鲁棒预补偿器设计方法．该方法设计的鲁棒预补偿器可以使摄动系统为鲁棒对角优势的，因而保证了系统的鲁棒稳定，并且具有保守性小，设计的控制器简单等优点．实际系统设计表明，该设计方法有效而实用．     

量子信道对纠缠鲁棒性的影响

考虑量子信道对多体纠缠鲁棒性的影响. 先根据可分态之集为一个凸闭集, 证明可以取到纠缠鲁棒性定义中的下确界, 再证明同一纠缠态ρ的两个最优态的凸组合仍是最优态, 纠缠鲁棒性作为定义态集合上函数是下半连续的; 最后, 分别给出一个量子信道不增加、 不减少[KG*8]及保持所有量子态的纠缠鲁棒性的充分必
要条件.     

多变量广义预测控制系统的鲁棒稳定性

根据非自适应下广义预测控制（ＧＰＣ）与线性二次型高斯（ＬＱＧ）最优控制间的一致关系,利用ＬＱＧ／ＬＴＲ技术对ＧＰＣ鲁棒稳定性作了分析,从而为ＧＰＣ中观测器矩阵的选取给出理论基础。     

量子信道对广义纠缠鲁棒性的影响

根据量子态之集是一个凸闭集, 证明了广义纠缠鲁棒性定义中的下确界是可以取到的,说明了同一量子态的两个广义最优态的凸组合仍是广义最优态,广义纠缠鲁棒性作为定义态集合上函数是下半连续的。其次,分别给出了一个量子信道不增加(不减少、保持)所有量子态的广义纠缠鲁棒性的充分必要条件。最后, 作为应用得到了相关已有结果。     

Bell inequality,separability and entanglement distillation

In this review,we introduce well-known Bell inequalities,the relations between the Bell inequality and quantum separability,and the entanglement distillation of quantum states.It is shown that any pure entangled quantum state violates one of Bell-like inequalities.Moreover,quantum states that violate any one of these Bell-like inequalities are shown to be distillable.New Bell inequalities that detect more entangled mixed states are also introduced.     

Entanglement of the orbital angular momentum states of photons.

Entangled quantum states are not separable, regardless of the spatial separation of their components. This is a manifestation of an aspect of quantum mechanics known as quantum non-locality. An important consequence of this is that the measurement of the state of one particle in a two-particle entangled state defines the state of the second particle instantaneously, whereas neither particle possesses its own well-defined state before the measurement. Experimental realizations of entanglement have hitherto been restricted to two-state quantum systems, involving, for example, the two orthogonal polarization states of photons. Here we demonstrate entanglement involving the spatial modes of the electromagnetic field carrying orbital angular momentum. As these modes can be used to define an infinitely dimensional discrete Hilbert space, this approach provides a practical route to entanglement that involves many orthogonal quantum states, rather than just two Multi-dimensional entangled states could be of considerable importance in the field of quantum information, enabling, for example, more efficient use of communication channels in quantum cryptography.     

非匹配条件下滑动模的鲁棒性

本文研究结构系统在非匹配条件下滑动模的鲁棒性问题，首先提出了变结构系统部分不变性的概念，进而给出了变结构系统具有部分不变性的充分必要条件；最后举一个例子验证所提出的方法，本文结果解决了不确定系统在何种条件下可以直接设计出具有期望动态品质的滑动模的问题。     

一类高维量子态的生成纠缠

研究了高维量子混合态的生成纠缠,给出了一类特殊量子混合态的生成纠缠的解析表示.     

Entanglement of spin waves among four quantum memories

Quantum networks are composed of quantum nodes that interact coherently through quantum channels, and open a broad frontier of scientific opportunities. For example, a quantum network can serve as a 'web' for connecting quantum processors for computation and communication, or as a 'simulator' allowing investigations of quantum critical phenomena arising from interactions among the nodes mediated by the channels. The physical realization of quantum networks generically requires dynamical systems capable of generating and storing entangled states among multiple quantum memories, and efficiently transferring stored entanglement into quantum channels for distribution across the network. Although such capabilities have been demonstrated for diverse bipartite systems, entangled states have not been achieved for interconnects capable of 'mapping' multipartite entanglement stored in quantum memories to quantum channels. Here we demonstrate measurement-induced entanglement stored in four atomic memories; user-controlled, coherent transfer of the atomic entanglement to four photonic channels; and characterization of the full quadripartite entanglement using quantum uncertainty relations. Our work therefore constitutes an advance in the distribution of multipartite entanglement across quantum networks. We also show that our entanglement verification method is suitable for studying the entanglement order of condensed-matter systems in thermal equilibrium.     

Entanglement of linear cluster states in terms of averaged entropies

An entanglement measure,multiple entropy measures(MEMS) was proposed recently by using the geometric mean of partial entropies over all possible i-body combinations of the quantum system.In this work,we study the average subsystem von Neumann entropies of the linear cluster state and investigated the quantum entanglement of linear cluster states in terms of MEMS.Explicit results with specific particle numbers are calculated,and some analytical results are given for systems with arbitrary particle numbers.Compared with other example quantum states such as the GHZ states and W states,the linear cluster states are "more entangled" in terms of MEMS,namely their averaged entropies are larger than the GHZ states and W states.