检索结果-南通市图书馆

A scheme to implement the Deutsch-Josza algorithm on a superconducting charge-qubit quantum computer

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2006年第6期16卷 594-599页

作者： HUO Wenyi and LONG Guilu (key laboratory for Quantum information and Measurements, and Department of Physics, Tsinghua University, beijing 100084, china key laboratory for Atomic and Molecular NanoSciences, Tsinghua University, beijing 100084, china) key laboratory for Quantum information and Measurements Department of Physics Tsinghua University Bejjing 100084 China key laboratory for Atomic and Molecular NanoSciences Tsinghua University Bejing 100084 China

We have studied the implementation of the Deutsch-Josza quantum algorithm in a superconducting charge-qubit quantum computer. Different from previous studies, we have used the inductance coupled system of You et al. The detailed pulse sequences have been designed for the four possible functions in a 2-qubit system. The result is generalized to an arbitrary n-qubit system. This scheme will be useful for practical implementation of the algorithm.

关键词： superconducting quantum computer Deutsch-Josza algorithm.

Capability description and discovery of Internetware entity

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(information Sciences) 2010年第4期53卷 685-703页

作者： WANG PuWei1*, JIN Zhi2,3* & LIU HongYan4 1key laboratory of Data Engineering and Knowledge Engineering of the ministry of education, Renmin University of china, beijing 100872, china 2key laboratory of High Confidence Software Technologies of the ministry of education, Peking University, beijing 100871, china 3Academy of Mathematics and system Sciences, Chinese Academy of Sciences, beijing 100190, china 4Department of Management Science and Engineering, Tsinghua University, beijing 100084, china key laboratory of Data Engineering and Knowledge Engineering of the ministry of education Renmin University of China Beijing China key laboratory of High Confidence Software Technologies of the ministry of education Peking University Beijing China Academy of Mathematics and system Sciences Chinese Academy of Sciences Beijing China Department of Management Science and Engineering Tsinghua University Beijing China

Internetware can be formed through aggregation of Internetware entities bottom-up to satisfy the user's requirements. In the process, capability description of Internetware entity plays an important role. This paper proposes a capability description of Internetware entity based on environment ontology. The environment ontology includes environment entities and possible interactions with the environment entities in a particular domain. Tree-like hierarchical state machines are also included in the ontology to describe domain life-cycle of the environment entities. On the basis of the ideas, the capability of Internetware entity is embodied by interacting with environment entities and the changes of the environment entities during the interactions. Finally, this paper describes the matchmaking between capability descriptions of Internetware entities to support the discovery of Internetware entity. An example of online education course is given to illustrate the ideas.

关键词： Internetware capability description domain environment ontology tree-like hierarchical state machine

Research on applying physical chaos generator to spacecraft information security

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2009年第5期52卷 1463-1470页

作者： ZHAO HePing State key laboratory of information security,Graduate University of Chinese Academy of Sciences,beijing 100049,china china Academy of Space Technology,beijing 100094,china State key laboratory of information security Graduate University of Chinese Academy of Sciences Beijing China china Academy of Space Technology Beijing China

The effectiveness of a short-length message extension method based on physical chaos generator was analyzed and the entropy of the extended message was calculated in this *** analysis demon-strated that with the mentioned method the entropy of short-length messages,which are repeatedly used in spacecraft data systems,is obviously increased,and the security of transmission is enhanced as *** paper also presented an improvement of the protocol for secret key agreement presented by *** and *** of depending on characteristics of communication channel,this method takes advantage of the random data produced by physical chaos generator to preset the initial parameters of the procedure on both sides of communication,so that the procedure and quantity of cipher key can be precisely *** method can be used to cipher key management of se-cure communication between long life-span spacecraft and ground system.

关键词： physical chaos generator spacecraft information security message extension cipher key management

维普期刊数据库

Efficient signcryption between TPKC and IDPKC and its multi-receiver construction

在线全文

学校读者我要写书评

暂无评论

Science china(information Sciences) 2010年第3期53卷 557-566页

作者： SUN YinXia & LI Hui key laboratory of Computer Networks and information security, ministry of education, Xidian University, Xi’an 710071, china key laboratory of Computer Networks and information security Ministry of Education Xidian University Xi’an China

The primitive signcryption provides authenticity and privacy simultaneously. In this paper, we present efficient signcryption schemes between the traditional public key cryptosystem (TPKC) and the identity based cryptosystem (IDPKC). In contrast, all the existing signcryption schemes available in the literature, to our knowledge, are limited to within one type of cryptosystem. We also discuss them in the multi-receiver setting. Formal security proofs are provided to guarantee the security for our schemes, in the random oracle model, under the hardness of the bilinear Diffie-Hellman problem.

关键词： signcryption TPKC IDPKC authenticity privacy random oracle model BDH multi-receiver

Multiparty quantum secret sharing of classical and quantum messages

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第1期17卷 26-31页

作者： CHEN Pan, DENG Fuguo and LONG Guilu ( key laboratory for Quantum information and Measurements, and Department of Physics, Tsinghua University, beijing 100084, china key laboratory of Beam Technology and Material Modification, MOE, Institute of Low Energy Nuclear Physics, and Department of Material Science and Engineering, beijing Normal University, beijing 100875, china beijing Radiation Center, beijing 100875, china key laboratory for Atomic and Molecular Nano-Sciences, Tsinghua University, beijing 100084, china) key laboratory for Quantum information and Measurements Department of Physics Tsinghua University Beijing 100084 China key laboratory of Beam Technology and Material Modification Beijing Normal University Beijing 100875 China Institute of Low Energy Nuclear Physics Department of Material Science and Engineering Beijing Normal University Beijing 100875 China beijing Radiation Center Beijing 100875 China key laboratory for Atomic and Molecular Nano-Sciences Tsinghua University Beijing 100084 China

A scheme for multiparty quantum secret sharing of classical and quantum messages is proposed by using entanglement swapping. This scheme can distribute not only the classical information but also the quantum informati... 详细信息

关键词： quantum secret sharing classical message quantum message EPR pair.

An approach to determining the local boundaries of voltage stability region with wind farms in power injection space

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2010年第12期53卷 3232-3240页

作者： MU YunFei & JIA HongJie key laboratory of Power system Simulation and Control of ministry of education, Tianjin University, Tianjin 300072, china key laboratory of Power system Simulation and Control of ministry of education Tianjin University Tianjin China

A new approach to determining the local boundaries of voltage stability region in power injection space (IVSR) for power system with wind farms is presented. It can be used for power system voltage stability analysis and on-line security assessment with considering the output uncertainty of the wind farms. Firstly, power flow tracing and double dispatching are used to determine the generators that are closely related to the wind farms, in order to balance the power fluctuations caused by the wind speed variation. Then, modal analysis is used to get the key generators to achieve an effective dimension reduction for IVSR. Finally, the forecasting output power (or wind speed) of wind farms is divided into several intervals. For each interval, the corresponding local IVSR boundaries can be calculated by the method based on small disturbance. Moreover, parallel process is used to accelerate the computing speed. The presented approach is validated by several power systems. It can be revealed that the approach can give the local IVSR boundaries at different wind speeds and has a good engineering application prospect.

关键词： voltage stability region power flow tracing modal analysis parallel process

维普期刊数据库

Measuring-basis-encrypted six-state quantum key distribution scheme

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2006年第1期16卷 84-89页

作者： CHEN Pan1, DENG Fuguo1, WANG Pingxiao1 and LONG Guilu1,2 (key laboratory for Quantum information and Measurements and Department of Physics, Tsinghua University, beijing 100084, china 2. key laboratory for Atomic and Molecular NanoSciences, Tsinghua University, beijing 100084, china) key laboratory for Quantum information and Measurements Department of Physics Tsinghua University Beijing 100084 China key laboratory for Atomic and Molecular NanoSciences Tsinghua University Beijing 100084 China

A six-state quantum key distribution scheme with measuring-basis encryption technique, which is based on the six-state protocol and the MBE protocol, is proposed. In this modified six-state quantum key distribution protocol, Alice and Bob use a control key to synchronize the use of their measuring-basis so that they always use the same measuring-basis. This modified six-state quantum key distribution protocol retains the advantage of higher security and at the same time has a higher efficiency.

关键词： quantum key distribution measuring-basis encrypted six-state security.

Design theory and method of multivariate hash function

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(information Sciences) 2010年第10期53卷 1977-1987页

作者： WANG HouZhen 1,2 , ZHANG HuanGuo 1 , WU QianHong 1 , ZHANG Yu 1 , LI ChunLei 1 & ZHANG XinYu 1 1 The key laboratory of Aerospace information security and Trusted Computing, ministry of education, School of Computer, Wuhan University, Wuhan 430072, china 2 key laboratory of Mathematics Mechanization, beijing 100080, china The key laboratory of Aerospace information security and Trusted Computing Ministry of Education School of Computer Wuhan University Wuhan China key laboratory of Mathematics Mechanization Beijing China

This paper proposes a novel hash algorithm whose security is based on the multivariate nonlinear polynomial equations of NP-hard problem over a finite field and combines with HAIFA iterative framework. Over the current widely used hash algorithms, the new algorithm has the following advantages: its security is based on a recognized difficult mathematical problem; the hash length can be changed freely; its design can be automated such that users may construct specific hash function meeting the actual needs. Furthermore, we discuss the security, efficiency and performance of the new algorithm. Under some related difficult mathematical assumptions and theoretical analysis, the new algorithm is proven practical by the experiment results, and capable of achieving security of an ideal hash function by choosing suitable parameters. In addition, it can also be used as a pseudo-random number generator for the good randomness of its output.

关键词： cryptology hash function MQ problem multivariate polynomials

Quick image-processing method of UAV without control points data in earthquake disaster area

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2011年第S3期21卷 523-528页

作者： LI Chang-chun1, ZHANG Guang-sheng1, LEI Tian-jie2, 3, GONG A-du2, 3 1. School of Surveying & Land information Engineering, Henan Polytechnic University, Jiaozuo 454000, china 2. key laboratory of Environmental Change and Natural Disaster, ministry of education, beijing Normal University, beijing 100875, china 3. ministry of Civil Affairs/ministry of education of china Academy of Disaster Reduction and Emergency Management, beijing Normal University, beijing 100875, china School of Surveying & Land information Engineering Henan Polytechnic University Jiaozuo 454000 China key laboratory of Environmental Change and Natural Disaster Ministry of Education Beijing Normal University Beijing 100875 China ministry of Civil Affairs/ministry of education of china Academy of Disaster Reduction and Emergency Management Beijing Normal University Beijing 100875 China

The methods of unmanned aerial vehicles images splicing rapidly and rectifying without control points data, only using auxiliary data recorded by unmanned aerial vehicle (UAV) system, were researched. Two algorithms were proposed, including UAV images auto- splicing rapidly after image blocking and UAV images rectifying based on pseudo center points of auxiliary data. When SIFT algorithm for UAV images splicing is applied, the accuracy is very high, but the efficiency is very low. The splicing efficiency is improved greatly based on SIFT algorithm after image blocking. The results show that rectifying accuracy is very high and has no visual dislocation when pseudo center points of auxiliary data is applied.

关键词： unmanned aerial vehicles SIFT algorithm blocking quickly splicing rectification

维普期刊数据库