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Dense coding scheme using superpositions of Bell-states and its NMR implementation

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Science china(Physics,mechanics & Astronomy) 2005年第1期48卷 57-67页

作者： ZHANG Jingfu, XIE Jingyi, DENG Zhiwei & LU Zhiheng Key Laboratory for Quantum Information and Measurements, Department of Physics, Tsinghua University, beijing 100084, china {2. for Quantum Information, Tsinghua University, beijing 100084, china Department of Materials Science and Engineering, beijing Normal University, beijing 100875, china Testing and Analytical {2., beijing Normal University, beijing 100875, china Department of Physics, beijing Normal University, beijing 100875, china 1. Key Laboratory for Quantum Information and Measurements Department of Physics Tsinghua University 100084 Beijing China 2. center for Quantum Information Tsinghua University 100084 Beijing China 3. Department of Materials Science and Engineering Beijing Normal University 100875 Beijing China 4. Testing and Analytical center Beijing Normal University 100875 Beijing China 5. Department of Physics Beijing Normal University 100875 Beijing China

Dense coding using superpositions of Bell-states is proposed. The generalized Grover's algorithm is used to prepare the initial entangled states, and the reverse process of the quantum algorithm is used to determine the entangled state in the decoding measurement. Compared with the previous schemes, the superpositions of two Bell-states are exploited. Our scheme is demonstrated using a nuclear magnetic resonance (NMR)quantum computer. The corresponding manipulations are obtained. Experimental results show a good agreement between theory and experiment. We also generalize the scheme to transmit eight messages by introducing an additional two-state system.

关键词： dense coding, superpositions of Bell-states, generalized Grover's algorithm, nuclear magnetic res-onance, quantum computer.

Mechanisms of the pancake vortex and vortex line movement in the high T_c superconductors Bi_2.r_2.aCu_2._8+δ and La_(1.93)Sr0.0_7CuO_4+δ

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Science china(Physics,mechanics & Astronomy) 2007年第2期50卷 240-248页

作者： WANG WeiXian1,ZHOU Fang2.TAN Shun1,WU Huan1 & ZHANG YuHeng1 1 National High Magnetic Field Laboratory,University of Science and Technology of china,Hefei 2.002.,china 2.National Laboratory for Superconductivity,lnstitute of Physics and the {2. for Condensed Matter Physics,Chinese Academy of Sciences,beijing 100080,china 1. National High Magnetic Field Laboratory University of Science and Technology of China Hefei 230026 China 2. National Laboratory for Superconductivity Institute of Physics and the Center for Condensed Matter Physics Chinese Academy of Sciences Beijing 100080 China

In the strict sense, it is not very clear why with magnetic field increasing, the normal-superconductive (NS) transition becomes broad for Bi2.r2.aCu2.8+δ(Bi2.12. while the NS transitions are almost parallel for La193Sroo7Cu04+δ(La2.4). In this paper, R-T relations are measured by the six-probe method. We propose a moving mechanism of the pancake vortex and vortex line for Bi2.12. The theoretical curves fit the experiment data well.

关键词： superconductivity superconductive pancake vortex dynamics

A MODEL FOR THE RELIABILITY ANALYSIS OF STRUCTURE UNDER RANDOM STRESS RANGE LOADINGS（RDCDR MODEL）

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Chinese Journal of Aeronautics 1994年第1期7卷 32-37页

作者： Xu Guojian Gao Zhentong(Research center of Solid mechanics, {2. Universityof Aeronautics and Astronautics,{2.,china,100083)

AbstractFatigue failure is caused by cumulative damage,so the method for fatigue reliabilityanalysis of structures under random stress range loadibings must be different from that forstatics reliability *** this paper,stochastic functions are used to describe theSN relation, and Miner′s linear cumulative damage tbeory is cmployed to set up a modelfor the reliability analysis of structure under random stress range *** model iscalled random determinate cumulative damage reliability model(RDCDR model)in *** parameters in the model can be estimated from the data of fatigue test underconstant range stress with maximum likelihood ***-Carlo method is used togive a numerical solution to the *** of application is demonstrated.

关键词：

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Editor's note

Science china(Physics,mechanics & Astronomy) 2008年第8期51卷 931-932页

作者： LIU Qingquan,Environmental Science and Technology center,institute of {2.,Chinese Academy of Sciences ZHENG Xiaojing,Key Laboratory of the {2. on Disaster and Environment in Western china,Ministry of Education,Lanzhou University,china Environmental Science and Technology center Institute of Mechanics Chinese Academy of Sciences Beijing China Key Laboratory of the mechanics on Disaster and Environment in Western china Ministry of Education Lanzhou University Lanzhou China

There has been a broad international awareness that the earth’s environment plays a critical role in the sustainable development of both human society and the global economy.

关键词： Editor’s note

Theory study of shapes in ^(187,189)Tl nuclei

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Science china(Physics,mechanics & Astronomy) 2009年第6期52卷 818-821页

作者： LIU YanXin1, YU ShaoYing1,2.3, SHEN CaiWan1,5 & DONG YongSheng1,2.4 1 School of Science, Huzhou Teachers College, Huzhou 313000, china 2.School of Science and Information Engineering, Zhejiang Normal University, Jinhua 32.000, china 3 {2. of Theoretical Physics, Chinese Academy of Sciences, beijing 100080, china 4 Department of Physics, Jining Teachers College, Jining 012.00, china 5 center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, china School of Science Huzhou Teachers College Huzhou 313000 China School of Science and Information Engineering Zhejiang Normal University Jinhua 321000 China institute of Theoretical Physics Chinese Academy of Sciences Beijing 100080 China Department of Physics Jining Teachers College Jining 012000 China center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China

The nuclear shapes of 187,189Tl were investigated theoretically in this work. The total routhian surface (TRS) calculations were performed for N=106 and 108 isotopes of thallium (Z=81). The single-particle energies were obtained from the deformed Woods-Saxon potential, with the Lipkin-Nogami (LN) treatment of pairing. It is found that the collective oblate rotation coexists with the high-K prolate rotation. Superdeformed prolate rotation is included in this calculation.

关键词： nuclear shape oblate rotation prolate rotation

杜仲抗真菌蛋白晶体生长的原子力显微成像研究——快速生长与晶面生长速率

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生物化学与生物物理进展 2003年第5期30卷 784-791页

作者：汪盛向烨李根培王大成中国科学院生物物理研究所分子生物学研究中心北京100101 中国科学院力学研究所国家微重力实验室北京100080 重庆大学生物工程学院重庆400044

杜仲抗真菌蛋白(Eucommiaantifungalprotein,EAFP)的单晶体具有在几小时内就可长大的快速生长特性.用原子力显微成像(atomicforcemicroscope,AFM)技术,原位实时观测了EAFP单斜晶体生长过程中的｛10 0｝表面形貌动态变化,并分别在不同的... 详细信息

杜仲抗真菌蛋白(Eucommiaantifungalprotein,EAFP)的单晶体具有在几小时内就可长大的快速生长特性.用原子力显微成像(atomicforcemicroscope,AFM)技术,原位实时观测了EAFP单斜晶体生长过程中的｛10 0｝表面形貌动态变化,并分别在不同的过饱和度下测量了其生长速率.结果表明,EAFP晶体生长的速率与蛋白质溶液的过饱和度相关,在过饱和度高时(σ =1 78)晶面生长极快;在中等过饱和度(σ =1 5)下,其晶面台阶的生长速率沿b,c方向分别为 12.m/s和 2.4 2.m/s,比溶菌酶生长速率(6～ 7nm/s)快很多;在蛋白质浓度很低的情况下,其生长速率仍与其他蛋白质相当.EAFP晶体快速生长可能与该分子尺寸较小,内部结构紧凑,分子骨架呈刚性和分子表面性质等其固有特性密切相关.沉淀剂浓度对EAFP晶体生长也有影响.过饱和度很低时,提高沉淀剂浓度会干扰晶体生长.

关键词：杜仲抗真菌蛋白晶体生长原子力显微成像晶面生长速率

Study of proton resonances in ^(18)Ne via resonant elastic scattering of ^(17)F+p and its astrophysical implication

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Science china(Physics,mechanics & Astronomy) 2011年第S1期54卷 32-36页

作者： HE JianJun1, HU Jun1,2. XU ShiWei1, CHEN ZhiQiang1, ZHANG XueYing1, WANG JianSong1, YU XiangQing1, ZHANG LiYong1,2. LI Long1,2. YANG YanYun1,2. MA Peng1,2. ZHANG XueHeng1, HU ZhengGuo1, GUO ZhongYan1, XU Xing1,2. YUAN XiaoHua1, LU Wan1,2. YU YuHong1, ZANG YongDong1,2. TANG ShuWen1,2. YE RuiPing1,2. CHEN JinDa1,2. JIN ShiLun1,2. DU ChengMing1,2. WANG ShiTao1,2. MA JunBing1,2. LIU LongXiang1,2. BAI Zhen1,2. LEI XiangGuo1, SUN ZhiYu1, ZHANG YuHu1, ZHOU XiaoHong1, XU HuShan1, SU Jun3, LI ErTao3, WANG HongWei4, TIAN WenDong4 & LI XiangQing5 1 institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, china 2.Graduate University of Chinese Academy of Sciences, {2. 100049, china 3 china institute of Atomic Energy (CIAE), {2. 102.13, china 4 Shanghai institute of Applied Physics (SINAP), Chinese Academy of Sciences, Shanghai 2.1800, china 5 School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, {2. 100871, china 1. institute of Modern Physics (IMP) Chinese Academy of Sciences Lanzhou 730000 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. China Institute of Atomic Energy (CIAE) Beijing 102413 China4. Shanghai Institute of Applied Physics (SINAP) Chinese Academy of Sciences Shanghai 201800 China5. School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China

The proton resonant properties in 18Ne, which determine the reaction rate of the key stellar 14O(α,p)17F reaction, have been studied by using a technique of proton resonant elastic scattering of 17F+p. A 4.2. MeV/nucleon 17F radioactive ion (RI) beam was produced via a projectile-fragmentation reaction, and separated by a Radioactive Ion Beam Line in Lanzhou (RIBLL). By bombarding a thick (CH2.n target, the energy spectra of the recoiled protons were measured by two ΔE-E silicon telescopes at the center-of-mass scattering angles of θc.m.≈175°±5°, θc.m.≈152.±8°, respectively. Several proton resonances in 18Ne were ob served clearly. A further R-matrix analysis of the experimental data is under way to determine the resonant parameters. The present work reports the preliminary results briefly.

关键词： resonant reaction reaction rate explosive burning accreting binary systems

DETECTION OF DELAMINATION IN A COMPOSITE PLATE BY SEM

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Chinese Journal of Mechanical Engineering 2001年第4期14卷 289-292页

作者： Du Sanhu,Zhan Fuliang,Li Zailiang (Solid mechanics Research center,{2. University of Aeronautics and Astronautics) 北京航空航天大学北京

A numerical method of integration of Green's functions of strip element method (SEM) is proposed The response of ultrasonic source generated by a transducer on the surface of a multi ply composite plate containing a delamination is analyzed by the use of SEM The numerical results show that the scanning features of the ultrasonic waves may be used to identify the delamination inside the composite plate.

关键词： Strip element method(SEM) Delamination Composite plate

Forced dissociation of P-selectin/PSGL-1 bonds using an optical trap assay

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Forced dissociation of P-selectin/PSGL-1 bonds using an opti...