检索结果-内蒙古大学图书馆

IEEE International Symposium on Information Theory

作者： Kai Chen Hoi-Kwong Lo Center for Quantum Information and Quantum Control Department of Electrical and Computer Engineering Department of Physics University of Toronto Toronto ONT Canada

ISBN: (纸本)0780391500

We propose a wide class of distillation schemes for multi-partite entangled states that are CSS-states. Our proposal provides not only superior efficiency, but also new insights on the connection between CSS-states and bipartite graph states. We then consider the applications of our distillation schemes for two cryptographic tasks - namely, (a) conference key agreement and (b) quantum sharing of classical secrets. In particular, we construct "prepare-and-measure" protocols. Also we study the yield of those protocols and the threshold value of the fidelity above which the protocols can function securely. Surprisingly, our protocols function securely even when the initial state does not violate the standard Bell-inequalities for GHZ states. Experimental realization involving only bipartite entanglement is also suggested

关键词： Quantum entanglement Cryptographic protocols Quantum computing Cryptography Cascading style sheets Bipartite graph Quantum mechanics Physics Proposals Paramagnetic resonance

来源：评论

学校读者我要写书评

暂无评论

Kinematics Modeling of a Wheel-Based Pole Climbing Robot (UT-PCR)

Kinematics Modeling of a Wheel-Based Pole Climbing Robot (UT...

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： A. Baghani M.N. Ahmadabadi A. Harati Robotics and AI Lab Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Iran

This paper is concerned with the derivation of the kinematics model of the University of Tehran-Pole Climbing Robot (UT-PCR). As the first step, an appropriate set of coordinates is selected and used to describe the state of the robot. Nonholonomic constraints imposed by the wheels are then expressed as a set of differential equations. By describing these equations in terms of the state of the robot an underactuated driftless nonlinear control system with affine inputs that governs the motion of the robot is derived. A set of experimental results are also given to show the capability of the UT-PCR in climbing a stepped pole.

关键词： Climbing robots Wheels Mobile robots Robot kinematics Road transportation Intelligent robots Inspection Cleaning Artificial intelligence Stability

来源：评论

学校读者我要写书评

暂无评论

Practical decoy state for quantum key distribution

引用

Physical Review A 2005年第1期72卷 012326-012326页

作者： Xiongfeng Ma Bing Qi Yi Zhao Hoi-Kwong Lo Center for Quantum Information and Quantum Control Department of Physics and Department of Electrical & Computer Engineering University of Toronto Toronto Ontario Canada M5S 3G4

Decoy states have recently been proposed as a useful method for substantially improving the performance of quantum key distribution (QKD). Here, we present a general theory of the decoy state protocol based on only two decoy states and one signal state. We perform optimization on the choice of intensities of the two decoy states and the signal state. Our result shows that a decoy state protocol with only two types of decoy states—the vacuum and a weak decoy state—asymptotically approaches the theoretical limit of the most general type of decoy state protocol (with an infinite number of decoy states). We also present a one-decoy-state protocol. Moreover, we provide estimations on the effects of statistical fluctuations and suggest that, even for long-distance (larger than 100 km) QKD, our two-decoy-state protocol can be implemented with only a few hours of experimental data. In conclusion, decoy state quantum key distribution is highly practical.

关键词： Quantum theory

来源：评论

学校读者我要写书评

暂无评论

Inefficiency and classical communication bounds for conversion between partially entangled pure bipartite states

引用

Physical Review A 2005年第3期72卷 032336-032336页

作者： Ben Fortescue Hoi-Kwong Lo Center for Quantum Information and Quantum Control Department of Electrical & Computer Engineering and Department of Physics University of Toronto Toronto Ontario Canada M5S 3G4

We derive lower limits on the inefficiency and classical communication costs of dilution between two-term bipartite pure states that are partially entangled. We first calculate explicit relations between the allowable error and classical communication costs of entanglement dilution using a previously described protocol, then consider a two-stage dilution from singlets with this protocol followed by some unknown protocol for conversion between partially entangled states. Applying overall lower bounds on classical communication and inefficiency to this two-stage protocol, we derive bounds for the unknown protocol. In addition we derive analogous (but looser) bounds for general pure states.

关键词： Quantum cryptography

来源：评论

学校读者我要写书评

暂无评论

Decoy State Quantum Key Distribution

引用

Physical Review Letters 2005年第23期94卷 230504-230504页

作者： Hoi-Kwong Lo Xiongfeng Ma Kai Chen Center for Quantum Information and Quantum Control Department of Electrical & Computer Engineering and Department of Physics University of Toronto Toronto Ontario M5S 3G4 Canada

There has been much interest in quantum key distribution. Experimentally, quantum key distribution over 150 km of commercial Telecom fibers has been successfully performed. The crucial issue in quantum key distribution is its security. Unfortunately, all recent experiments are, in principle, insecure due to real-life imperfections. Here, we propose a method that can for the first time make most of those experiments secure by using essentially the same hardware. Our method is to use decoy states to detect eavesdropping attacks. As a consequence, we have the best of both worlds—enjoying unconditional security guaranteed by the fundamental laws of physics and yet dramatically surpassing even some of the best experimental performances reported in the literature.

关键词： Quantum theory

来源：评论

学校读者我要写书评

暂无评论

Continuous time system identification of nonparametric models with constraints

Continuous time system identification of nonparametric model...

引用

作者： Wang, Liuping Gawthrop, Peter J. Young, Peter C. School of Electrical and Computer Engineering RMIT University Melbourne Australia Center for Systems and Control Department of Mechanical Engineering University of Glasgow Glasgow G12 8QQ United Kingdom Centre for Research on Environmental Syst. and Stat. Lancaster University LA1 4 YQ United Kingdom

ISBN: (纸本)008045108X

Although structural constraints such as model order and time delay have been incorporated in the continuous time system identification since its origin, the constraints on the estimated model parameters were rarely enforced. This paper proposes a continuous time system identification approach with constraints. It shows that by incorporating physical parameter information known a priori as hard constraints, the traditional parameter estimation schemes are modified to minimize a quadratic cost function with linear inequality constraints. Using the structure of Frequency Sampling Filters as the vehicle, the paper shows that the constraints can be readily imposed on continuous time frequency response estimation and step response estimation. in particular, a priori knowledge in both time-domain and frequency domain is utilized simultaneously as the constraints for the optimal parameter solution. A Monte-Carlo simulation study with 100 noise realization is used to demonstrate the improvement of the estimation results in terms of continuous time frequency response and continuous time step response. Copyright © 2005 IFAC.

关键词： Frequency response

来源：评论

学校读者我要写书评

暂无评论

Identification of multivariable systems based on finite impulse response models with flexible orders

Identification of multivariable systems based on finite impu...

引用

IEEE International Conference on Mechatronics and Automation

作者： Feng Ding Tongwen Chen Control Science and Engineering Research Center Southern Yangtze University Wuxi China Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada

For multi-input, multi-output stochastic systems, by means of auxiliary models - finite impulse response (FIR) models, we develop an identification algorithm to estimate the FIR model parameters of each entry (sub-submodel) of transfer matrices with an increasing order for the FIR model. The basic idea is to use auxiliary models to predict/estimate the outputs of the sub-submodels, and further to use the recursive least squares algorithm or the Pade approximation method to produce the parameter estimates of sub-submodels. Some simulation results are included.

关键词： MIMO Finite impulse response filter Parameter estimation Least squares approximation Predictive models Recursive estimation Stochastic systems Approximation algorithms Approximation methods System identification

来源：评论

学校读者我要写书评

暂无评论

Adaptive H∞ -Contro1 Design for a Class of LPV Systems

Adaptive H∞ -Contro1 Design for a Class of LPV Systems

引用

IEEE Conference on Decision and control

作者： H.R. Karimi B. Moshiri P.J. Maralani B. Lohmann Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran Institute of Automatic Control Technical University Munich Munich Germany

In this paper, we focus on the issue of adaptive H ∞ -control design for a class of linear parameter-varying (LPV) systems based on the Hamiltonian-Jacobi-Isaac (HJI) method. By combining the idea of polynomially parameter-dependent quadratic functions and vector projection method to derive an adaptive H ∞ -control, sufficient conditions with high precision are given to guarantee both robust asymptotic stability and disturbance attenuation of the LPV systems with unknown constant parameters. The applicability of the proposed design method is illustrated on a simple example.

关键词： Robust stability Polynomials Linear matrix inequalities Symmetric matrices Attenuation Asymptotic stability Sufficient conditions Automatic control Programmable control Adaptive control

来源：评论

学校读者我要写书评

暂无评论

H//sub/spl infin// control of linear parameter-dependent state-delayed systems

H//sub/spl infin// control of linear parameter-dependent sta...

引用

IEEE Conference on control Technology and Applications (CCTA)

In this paper, we deal with the issue of robust delay-independent asymptotic stability and robust disturbance attenuation problem for linear parameter-dependent systems. Using Hamiltonian-Jacoby-Isaac approach, a parameter-dependent LMI optimization is obtained. It is shown that by utilizing polynomial parameter-dependent quadratic Lyapunov functions, a parameter-dependent LMI optimization problem is derived. Therefore, state feedback control is determined by solving a parameter-independent LMI. Finally, the applicability of the proposed design is illustrated on a simple example

关键词： control systems Lyapunov method Robust stability Process control Polynomials Attenuation Linear systems Sufficient conditions Vectors Intelligent control

来源：评论

学校读者我要写书评

暂无评论

An interpolative fuzzy inference using least square principle by means of /spl beta/-function and high order polynomials

An interpolative fuzzy inference using least square principl...

引用

IEEE International Conference on Mechatronics and Automation

作者： F. Kiasi C. Lucas A. Fazl Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Iran Electrical Engineering Faculty K.N. Toosi University of Technology Tehran Iran

Many researchers have been interested in approximation properties of fuzzy logic systems (FLS), which like neural networks, can be seen as approximation schemes. Almost all of them tackled Mamdani fuzzy model, which was shown to have many interesting features. This paper aims to present an alternative for traditional inference mechanisms and CRI method. The most attractive advantage of this new method is its higher robustness with respect to changes in rule base and ability to operate when latter is sparse. In this paper interpolation with high order polynomials and /spl beta/-function is reported.

关键词： Least squares methods Polynomials Fuzzy systems Fuzzy sets Fuzzy logic Interpolation Least squares approximation Engines Fuzzy control Curve fitting

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：