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Two-Qubit Quantum Logic Gate in Molecular Magnets

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Chinese physics Letters 2005年第9期22卷 2147-2150页

作者：侯净敏田立君葛墨林 Department of physics Southeast University Nanjing 210096 Theoretical physics Division Nankai Institute of Mathematics Nankai University Tianjin 300071 Department of physics Shanghai University Shanghai 200436

We propose a scheme to realize a controlled-NOT quantum logic gate in a dimer of exchange coupled singlemolecule magnets, [Mn4]2. We chosen the ground state and the three low-lying excited states of a dimer in a finite longitudinal magnetic field as the quantum computing bases and introduced a pulsed transverse magnetic field with a special frequency. The pulsed transverse magnetic field induces the transitions between the quantum computing bases so as to realize a controlled-NOT quantum logic gate. The transition rates between a pair of the four quantum computing bases and between the quantum computing bases and excited states are evaluated and analysed.

关键词： COMPUTATION DYNAMICS DIMER

Autonomous map query:robust visual localization in urban environments using Multilayer Feature Graph

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High Technology Letters 2015年第1期21卷 31-38页

作者：李海丰 Wang Hongpeng Liu Jingtai College of Computer Science and Technology Civil Aviation University of China insititute of Robotics and Automatic Information System Nankai University

When a vehicle travels in urban areas, onboard global positioning system （GPS） signals may be obstructed by high-rise buildings and thereby cannot provide accurate positions. It is proposed to perform localization by registering ground images to a 2D building boundary map which is generated from aerial images. Multilayer feature graphs （MFG） is employed to model building facades from the ground images. MFG was reported in the previous work to facilitate the robot scene understand- ing in urhan areas. By constructing MFG, the 2D/3D positions of features can be obtained, inclu- cling line segments, ideal lines, and all primary vertical planes. Finally, a voting-based feature weighted localization method is developed based on MFGs and the 2D building boundary map. The proposed method has been implemented and validated in physical experiments. In the proposed ex- periments, the algorithm has achieved an overall localization accuracy of 2.2m, which is better than commercial GPS working in open environments.

关键词： visual localization urban environment multilayer feature graph( MFG) voting- based method

NEW SEMI-CLASSICAL TREATMENT OF THE SKYRME MODEL

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Chinese physics Letters 1989年第6期6卷 249-252页

作者： ZHENG Shian Department of physics Nankai UniversityTianjin

A new quantum mechanical approximation of the SU(2)Skyrme model is obtained out of the field *** the assumption for the zero point energy,the experimental value of FT can be adopted to compute the static prop-erties of the baryons in a consistent *** delta appears as a^quasisoliton^,and the predictions of μp,μn and gA get a considerable improvement.

关键词： CLASS soliton quantum

Determining the sum of flexoelectric coefficients in nematic liquid crystals by the capacitance method

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Chinese physics B 2014年第11期23卷 414-421页

作者：叶文江邢红玉崔文静周璇孙玉宝张志东 School of Sciences Hebei University of Technology School of physics Nankai University

A detailed theoretical analysis of determining the sum of flexoelectric coefficients in nematic liquid crystals using the capacitance method is given. In the strong anchoring parallel aligned nematic （PAN） and hybrid aligned nematic （HAN） cells, the dependences of the capacitance on the sum of flexoelectric coefficients and the applied voltage are obtained by numerical simulations, and the distributions of the director and the electric potential for different applied voltages and flexoelectric coefficients are also given. Based on this theoretical analysis, we propose an experimental design for measuring the capacitance of a liquid crystal cell using the improved precision LCR meter E4980A （Agilent）. Through comparing the experimental data with the simulated results, the sum of flexoeletric coefficients can be determined.

关键词： flexoelectricity capacitance parallel aligned nematic and hybrid aligned nematic liquid crystals

Properties of Zero Dispersion Wavelengths in Silica Strands and Photonic Crystal Fibres

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Chinese physics Letters 2008年第3期25卷 993-995页

作者：张德生盛秋琴董孝义 Institute of physics Science Nankai University Tianjin 300071

To design and calculate the zero-dispersion wavelength is one of the important aspects for highly nonlinear photonic crystal fibres. By using the air filling fraction f defined as f = （ 6d） / （ 2π∧ ） here for the cladding effective index, and the step effective index model, the relationship between the properties of chromatic dispersion and the two different structures has been analysed. It is pointed that the variation of the zero dispersion wavelength is insensitive to the core diameter change in one range of core diameter D, while keeping the air filling fraction f constant. In the other range of core diameter D, the photonic crystal fibres have the best nearly-zero ultraflattened dispersion. These properties are significant to the design of chromatic dispersion and zero dispersion wavelength in photonic crystal fibres.

关键词： FLATTENED DISPERSION HOLEY FIBERS INDEX

Saturable Nonlinearity in Photovoltaic-Photorefractive Crystals Under Open-circuit Condition

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Chinese physics Letters 2000年第11期17卷 804-805页

作者： GUO Ru LING Zhen-Fang CHEN Xiao-Hu ZHANG Guo-Quan ZHANG Xin-Zheng WEN Hai-Dong JIANG Ying LIU Si-Min College of physics Science Nankai UniversityTianjin 300071

We show that the refractive index change induced by a focused incident beam with an additional incoherent uniform illumination in photovoltaic-photorefractive crystals under open-circuit condition has a saturable nonlinearity *** incoherent uniform background illumination can be used to increase the effective dark *** formation time of the photovoltaic soliton can be decreased by keeping the intensity of the soliton at a higher value without over-saturation by use of the background illumination.

关键词： form. illumination soliton

Testing lepton f lavor universality in terms of BESⅢ and charm-tau factory data

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Chinese physics C 2013年第7期37卷 1-12页

作者：王斌赵明刚孙科盛李学潜 School of physics Nankai University Department of physics Dalian University of Technology School of physics Hebei University

The recent measurements on Rκ and Rπ imply that there exists a possible violation of the leptonic flavor universality which is one of the cornerstones of the Standard Model. It is suggested that a mixing between sterile and active neutrinos might induce such a violation. In this work we consider the scenarios with one or two sterile neutrinos to explicitly realize the data while the constraints from the available experiments have been taken into account. Moreover, as indicated in literature, the deviation of the real PMNS matrix from the symmetric patterns may be due to a μ-τ asymmetry, therefore the measurements on RD（Ds）eμ=F（D（Ds）→e＋νe）/Г（D（Ds）→μ＋νμ） and RD（Ds）μτ=Г（D（Ds）→μ＋νμ）Г（D（Ds）→ι＋ντ）（and for some other heavy mesons B± and Bc etc.） may shed more light on the physics responsible for the violation of the leptonic flavor universality. The data of BESⅢ are available to test the universality and that of future charm-tau factories will provide more accurate information. In this work, we will discuss RD（Ds）eμ and RD（Ds）μτ in detail and also briefly consider the cases for B± and Bc.

关键词： neutrino mass and mixing lepton flavor universality sterile neutrino

Light Amplification in Non-photorefractive Doped Polymer Film at Red Light Wavelength

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Chinese physics Letters 1997年第3期14卷 179-182页

作者： XU Jing-jun FANG Qi-yin MA Chao-li ZHANG Guang-yin SUN Qian ZHANG Guo-quan LIU Si-min TIAN Guo-yun WU Qiang CHEN Xiao-bo Department of physics Nankai UniversityTianjin 300071 physics Department Osnabrueck University45069 OsnabrueckGermany Institute of Polymer Chemistry Nankai UniversityTianjin 300071

Experimental studies of light amplification with dynamic multiwave gratings recorded in an acceptor-donor-substituted azobenzene-doped poly(methyl methacrylate)thin film by multi-wave mixing are *** amplification gain... 详细信息

关键词： donor mixing film

Complete Condensation of Zero Range Process in Fitness Networks

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Communications in Theoretical physics 2015年第12期64卷 753-757页

作者：苏桂锋李晓温张小兵张一李薛 Department of physics Shanghai Normal University School of physics Nankai University

In current paper we study the so-called "complete condensation" of zero range process on the fitness network. It is found that under the high temperature limit,the condensation behavior on the fitness model converges to that of the scale-free network,as expected. However,at some temperatures below the critical temprature of Bose–Einstein condensate phase on the fitness network,the complete condensation occurs as well for some values of δ>δ_c,which is impossible on scale-free network according to the criterion.

关键词： zero range process fitness network complete conden