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Multiparty quantum secret sharing of classical and quantum messages

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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, {3., 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, {3., China) [a]Key laboratory for Quantum information and Measurements and Department of Physics Tsinghua University Beijing China [b]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 China [c]beijing Radiation Center Beijing China [d]Key laboratory for Atomic and Molecular Nano-sciences Tsinghua University Beijing 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.

All-optical NOR gate based on injection-locking effect in a semiconductor laser

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光电子快报：英文版 2008年第1期4卷 33-37页

作者： HAN Liu-yan, ZHANG Han-yi, and GUO Yi-li State Key laboratory on Integrated Optoelectronics, national laboratory for {3. science and technology, De- partment of Electronic Engineering, tsinghua University, beijing 100084, China State Key laboratory on Integrated Optoelectronics National Laboratory for Information Science and Technology De-partment of Electronic Engineering Tsinghua University Beijing 100084 China

A scheme for all-optical NOR logic gate is proposed based on injection-locking effect in a semiconductor laser. In this scheme, signal light injection into the laser will cause frequency shift of laser modes, as a result, the probe light into the laser can be switched between injection-locked and unlocked status, and its output power will be modulated. Theoretical analysis for this scheme is carried out by using a model to describe the dynamics of the injection-locked laser. By numerical simulation, the influence of laser bias current, laser length, injected signal power and signal frequency on the output performance of NOR logic gate is quantitatively analyzed.

关键词：半导体激光器注入锁相效应全光或非门光纤通信

Implementation of a multiple round quantum dense coding using nuclear magnetic resonance

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science China(Physics,Mechanics & Astronomy) 2005年第6期48卷 706-715页

作者： ZHANG Jingfu1, XIE Jingyi2, WANG Chuan1, DENG Zhiwei3. LU Zhiheng4, & LONG Guilu1,5 1. Key laboratory For Quantum information and Measurements of MOE, Department of Physics, tsinghua University, {3.,China 2. Department of Materials science and Engineering, beijing Normal University, beijing 100875, China 3. Testing and Analytical Center, beijing Normal University, beijing 100875,China 4. Department of Physics, beijing Normal University, beijing 100875, China 5. Key laboratory For atomic and Molecular Nanosciences, tsinghua University, {3.,China 1. Key laboratory For Quantum information and Measurements of MOE Department of Physics Tsinghua University 100084 Beijing China 2. Department of Materials science and Engineering Beijing Normal University 100875 Beijing China 3. Testing and Analytical Center Beijing Normal University 100875 Beijing China 4. Department of Physics Beijing Normal University 100875 Beijing China 5. Key laboratory For Atomic and Molecular Nanosciences Tsinghua University 100084 Beijing China

A multiple round quantum dense coding scheme based on the quantum phase estimation algorithm is proposed and implemented in a three qubit nuclear magnetic resonance (NMR) quantum computer. Using an m + 1 qubit system, Bob can transmit one of 2m+1 messages to Alice, through manipulating only one qubit and exchanging it between Alice and Bob for m rounds. The information capacity is enhanced to m + 1 bits as compared to m bits in a classical scheme. The scheme has been demonstrated in NMR system, and the experimental results show a good agreement between theory and experiment.

关键词： quantum dense coding, multiple round, nuclear magnetic resorance

Preparation of NiFe binary alloy nanocrystals for nonvolatile memory applications

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science China(Technological sciences) 2010年第9期53卷 2320-2322页

作者： WANG Li,SUN HongFang,ZHOU HuiHua & ZHU Jing beijing national Center for Electron Microscopy laboratory,Department of Materials {3. and Engineering,tsinghua University,beijing 100084,China 1. beijing national Center for Electron Microscopy laboratory Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

In this work,an idea which applies binary alloy nanocrystal floating gate to nonvolatile memory application was *** relationship between binary alloy’s work function and its composition was discussed theoretically.A nanocrystal floating gate structure with NiFe nanocrystals embedded in SiO2 dielectric layers was fabricated by magnetron *** micro-structure and composition deviation of the prepared NiFe nanocrystals were also investigated by TEM and EDS.

关键词： nanocrystal nonvolatile memory work function magnetron sputtering

Multiparty simultaneous quantum identity authentication with secret sharing

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science China(Physics,Mechanics & Astronomy) 2008年第3期51卷 321-327页

作者： YANG YuGuang1,2,WEN QiaoYan3.& ZHANG Xing4,5 1 College of Computer science and technology,beijing University of technology,beijing 100022,China 2 State Key laboratory of information Security (Graduate University of the Chinese Academy of sciences),beijing 100049,China 3.School of science,beijing University of Posts and Telecommunications,beijing 100876,China 4 Institute of Electronic technology,information Engineering University,Zhengzhou 450004,China 5 Trusted Computing laboratory,beijing University of technology,beijing 100022,China College of Computer science technology Beijing University of Technology Beijing 100022 China State Key laboratory of information Security [Graduate University of the Chinese Academy of sciences] Beijing 100049 China School of science Beijing University of Posts Telecommunications Beijing 100876 China Institute of Electronic technology Information Engineering University Zhengzhou 450004 China Trusted Computing laboratory Beijing University of Technology Beijing 100022 China

Two multiparty simultaneous quantum identity authentication (MSQIA) protocols based on secret sharing are presented. All the users can be authenticated by a trusted third party (TTP) simultaneously. In the first protocol,the TTP shares a random key K with all the users using quantum secret sharing. The ith share acts as the authentication key of the ith user. When it is necessary to perform MSQIA,the TTP generates a random number R secretly and sends a sequence of single photons encoded with K and R to all the users. According to his share,each user performs the corresponding unitary operations on the single photon sequence sequentially. At last,the TTP can judge whether the impersonator exists. The sec-ond protocol is a modified version with a circular structure. The two protocols can be efficiently used for MSQIA in a network. They are feasible with current technol-ogy.

关键词： quantum identity authentication secret sharing quantum cryptography

Cavitation-erosion resistance of arc ion-plated (Ti, Cr) N coatings

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science China Mathematics 2001年第S1期44卷 369-374页

作者： PAN Guoshun YANG Wenyan national Tribology laboratory, tsinghua University, {3., China tsinghua Univ Natl Tribol Lab Beijing 100084 Peoples R China

The cavitation-erosion behavior of (Ti,Cr)N multi-component coatings produced by arcion-plating on grey cast iron was studied by using an ultrasonic cavitation -erosion testing appara-tus and scanning electron microscopy. The test results indicated that surface roughness of thesubstrate, surface morphology of the coating, substrate bias voltage and the thickness of the coat-ing had certain influence on the erosion rate. Arc ion-plated (Ti,Cr)N multi-component coatingsshowed better cavitation -erosion resistance than single component coatings because of highermicrohardness and good adhesion.

关键词： cavitation-erosion ion plating (Ti, Cr) N coatings grey cast iron

A verifiable low-level concurrent programming model based on colored Petri nets

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science China(information sciences) 2011年第10期54卷 2013-2027页

作者： WANG ShengYuan & DONG Yuan Department of Computer science and technology,tsinghua University,{3.,China 1. Department of Computer science and technology Tsinghua University Beijing 100084 China

Concurrent programs written in a machine-level language are being used in many areas,but the verification of such programs brings various new challenges to the programming language *** of existing contributions on verifying the safety properties of concurrent programs are for high-level languages,specifications,or calculi in the *** to the lack of abstraction at a low level,additional work is needed to extend these methods to machine-level *** paper describes an approach to integrate Petri nets into low-level concurrent programs to form a new programming model (abstract machine).A program in the programming model is a restricted version of colored Petri net,with transitions colored by assembly codes for machine-level threads,and places colored by shared data consisting of memory locations or *** analysis and verification approaches for usual Petri nets can be applied indirectly for such a low-level concurrent program.

关键词： low-level concurrent programs colored Petri nets abstract machine verification

Adaptive neural control based on HGO for hypersonic flight vehicles

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science China(information sciences) 2011年第3期54卷 511-520页

作者： XU Bin 1,2 , GAO DaoXiang 3.& WANG ShiXing 1 1 Department of Computer science and technology, tsinghua University, {3., China 2 Autonomous System Lab, ETH Zurich Zurich 8092, Switzerland 3.School of technology, beijing Forestry University, beijing 100083. China 1. Department of Computer science and technology Tsinghua University Beijing 100084 China2. Autonomous System Lab ETH Zurich Zurich 8092 Switzerland3. School of Technology Beijing Forestry University Beijing 100083 China

This paper describes the design of adaptive neural controller for the longitudinal dynamics of a generic hypersonic flight vehicle (HFV) which are decomposed into two functional systems, namely the altitude subsystem and the velocity subsystem. For each subsystem, one adaptive neural controller is investigated based on the normal output-feedback formulation. For the altitude subsystem, the high gain observer (HGO) is taken to estimate the unknown newly defined states. Only one neural network (NN) is employed to approximate the lumped uncertain system nonlinearity during the controller design which is considerably simpler than the ones based on back-stepping scheme with the strict-feedback form. The Lyapunov stability of the NN weights and filtered tracking error are guaranteed in the semiglobal sense. Numerical simulation study of step response demonstrates the effectiveness of the proposed strategy in spite of system uncertainty.

关键词： adaptive neural control hypersonic flight vehicle high gain observer output-feedback

A stochastic policy search model for matching behavior

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science China(information sciences) 2011年第7期54卷 1430-1443页

作者： CHENG ZhenBo 1,2,ZHANG Yu 1 & DENG ZhiDong 1 1 State Key laboratory on Intelligent technology and Systems,tsinghua {3. laboratory for information science and technology,Department of Computer science,tsinghua University,beijing 100084,China 2 Department of Computer science and technology,Zhejiang University of technology,Hangzhou 3.0014,China 1. State Key laboratory on Intelligent technology and Systems Tsinghua National Laboratory for Information Science and Technology Department of Computer Science Tsinghua University Beijing 100084 China2. Department of Computer Science and Technology Zhejiang University of Technology Hangzhou 310014 China

The matching law is one of the basic empirical laws in decision theory,and it states that a subject’s preference to optional targets depends on which choices are *** this paper,we study the possible mechanisms that explain why subjects’ decisions often obey this *** the basis of reinforcement learning theory,we put forward a decision-making model in which the policy is updated by a policy parameter,and the model might be implemented in the brain through the prefrontal cortex and the basal ganglia neural *** on this model,an algorithm that satisfies the matching law is derived under some simple *** analysis and simulation results show that the decision behavior achieved by the algorithm obeys the matching *** addition,the matching behaviors in two classical experiments are reproduced using the *** results provide a reasonable strategy for the matching law and a useful computational tool for rewarded decision-making tasks.

关键词： policy model matching law reinforcement learning decision-making model