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Effects of noisy quantum channels on one-qubit rotation gate

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Science China(Physics,Mechanics & Astronomy) 2012年第5期55卷 808-814页

作者： xu guofu Kwek L.C TONG DianMin Department of Physics Shandong UniversityJinan 250100China Center for Quantum Technologies National University of SingaporeScience Drive 2 Singapore 117543Singapore

We investigate the effects of noisy quantum channels on the entanglement of cluster states and one way quantum computational *** take a basic model,the rotational gate about x axis based on the cluster state,in order to get the most essential effects of the paradigmatic noisy quantum *** entanglement of cluster states in the noisy channels and the fidelity between the rotated state without noisy channel and that with noisy channel are calculated.

关键词： one-way quantum computation entanglement decoherence

Development of an Intelligent Vehicle Experiment System

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Chinese Journal of Mechanical Engineering 2010年第6期23卷 684-689页

作者： YANG Xinhong GAO Feng LIU Guoliang WANG guofu xu Guoyan School of Transportation Science ＆ Engineering Beihang University Beijing 100191 China

Existing vehicle experiment systems tend to focus on the research of vehicle dynamics by conducting performance tests on every system or some parts of the vehicle so as to improve the entire performance of the vehicle. Virtual technology is widely utilized in various vehicle test-beds. These test-beds are mainly used to simulate the driving training, conduct the research on drivers＇ behaviors, or give virtual demonstrations of the transportation environment. However, the study on the active safety of the running vehicle in the virtual environment is still insufficient. A virtual scene including roads and vehicles is developed by using the software Creator and Vega, and radars and cameras are also simulated in the scene. Based on dSPACE＇s rapid prototyping simulation and its single board DS1103, a simulation model including vehicle control signals is set up in MATLAB/Simulink, the model is then built into C code, and the system defined file（SDF） is downloaded to the DS1103 board through the experiment debug software ControlDesk and is kept running. Programming is made by mixing Visual C＋＋ 6.0, MATLAB API and Vega API. Control signals are read out by invoking library function MLIB/MTRACE of dSPACE. All the input, output, and system state values are acquired by arithmetic and are dynamically associated with the running status of the virtual vehicle. An intelligent vehicle experiment system is thus developed by virtue of program and integration. The system has not only the demonstration function, such as general driving, cruise control, active avoiding collision, but also the function of virtual experiment. Parameters of the system can be set according to needs, and the virtual test results can be analyzed and studied and used for the comparison with the existing models. The system reflects the running of the intelligent vehicle in the virtual traffic environment, at the same time, the system is a new attempt performed on the intelligent vehicle travel research and prov

关键词： intelligent vehicle signals integration mix programming virtual experiments

SOLIDIFYING　STRUCTURES　OF　Al_2O_3　SHORT　FIBER／Al－Si　ALLOY　MATRIX　COMPOSITE　PREPARED　BY　SQUEEZE　CASTING

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中国有色金属学会会刊：英文版 1995年第3期5卷 133-135页

作者： Zhang, Siqi Huang, Jinsong Shen, Jian Lu, Bin xu, guofu Central South Univ of Technology Changsha China

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关键词： composite short fiber Al-Si alloy solidifying structures squeeze casting

A bridge between acoustic metamaterials and quantum computation

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Science China(Physics,Mechanics & Astronomy) 2022年第4期65卷 120-120页

作者： guofu xu Department of Physics Shandong UniversityJinan 250100China

Acoustic waves are one necessary ingredient for many useful *** complete these tasks,acoustic waves need to be transmitted in certain ways,and sometimes,people would like them to be transmitted in ways that are unnatural through passive *** latter seemingly unrealistic wish became true with the advent of acoustic metamaterials,which sunrises people very *** metamaterials are artificial materials made of well-designed microstructures[1].

关键词： quantum latter Acoustic

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On the low cycle fatigue behaviour of an Al-Zn-Mg-Cu alloy processed via non-isothermal ageing

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Journal of Materials Science & Technology 2024年第1期168卷 227-238页

作者： Guangyi Guo guofu xu Yuan Tang Zhihao Zhao Zhihao Yi Haoran Li Ruohan Wang Xiaoyan Peng School of Materials Science and Engineering Central South UniversityChangsha 410083China Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education Changsha 410083China

The low cycle fatigue behaviour of an Al-Zn-Mg-Cu alloy processed via non-isothermal ageing(NIA)was examined at different strain *** showed that NIA improved the low cycle fatigue life(more than 7000 cycles)by optimising the precipitate configuration within 5.5 h while maintaining comparable mechanical properties(570 MPa for tensile strength)and conductivity(nearly 39%IACS)to conventional isothermal ageing,*** observation combined with molecular dynamic simula-tion revealed that precipitation configuration manipulated by NIA had a crucial effect on fatigue resis-tance.A great number of repeatedly sheared and locally destructed GP zones enhanced co-planar slip and slip localisation in the under-aged alloy during the early stage of NIA,responsible for the dramatic displacement steps on the surface and resultant poor fatigue *** the NIA further proceeded,moderately coarsened precipitates with an average dimension of 6.0 nm and elevated number density ef-fectively impeded the dislocation movement and weaken the slip localisation to a great extent,improving the fatigue performance within a few hours.

关键词： Non-isothermal ageing Fatigue Al-Zn-Mg-Cu alloy Precipitate manipulation Slip localization

Low-temperature and flexible strategy to in-situ fabricate ZrSiO_(4)-based ceramic composites via doping and tuning solid-state reaction

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Journal of Advanced Ceramics 2023年第6期12卷 1238-1257页

作者： Bohan Wang Le Fu Junjie Song Wenjun Yu Ying Deng guofu xu Jiwu Huang Wei Xia School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 264006China Applied Materials Science Department of Materials Science and EngineeringUppsala UniversityUppsala 75121Sweden

Synthetic zircon(ZrSiO_(4))ceramics are typically fabricated at elevated temperatures(over 1500℃),which would lead to high manufacturing ***,reports about preparing ZrSiO_(4)-based ceramic composites via controlling the solid-state reaction between zirconia(ZrO_(2))and silica(SiO_(2))are *** this work,we proposed a low-temperature strategy to flexibly design and fabricate ZrSiO_(4)-based ceramic composites via doping and tuning the solid-state *** ceramic composites and ZrSiO_(4) ceramics were in-situ prepared by reactive fast hot pressing(FHP)at approximately 1250℃ based on the proposed strategy,i.e.,a ZrSiO_(4)-SiO_(2) dual-phase composite with bicontinuous interpenetrating and hierarchical microstructures,a ZrSiO_(4)-ZrO_(2) dual-phase composite with a microstructure of ZrO_(2) submicron-and nano-particles embedded in a micron ZrSiO_(4) matrix,and ZrSiO_(4) ceramics with a small amount of residual ZrO_(2) *** results showed that the phase compositions,microstructure configurations,mechanical properties,and wear resistance of the materials can be flexibly regulated by the proposed ***,ZrSiO_(4)-based ceramic composites with different properties can be easily fabricated based on different application *** findings would offer useful guidance for researchers to flexibly fabricate ZrSiO_(4)-based ceramic composites at low temperatures and tailor their microstructures and properties through doping and tuning the solid-state reaction.

关键词： zirconia(ZrO_(2))-silica(SiO_(2)) zircon(ZrSiO_(4)) solid-state reaction ceramic composite mechanical properties wear resistance

BREAKAGE MECHANISM OF TUNGSTEN BASED ALLOY BLOCK FOR ELECTRO-HEAT UPSETTING

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中国有色金属学会会刊：英文版 1993年第3期3卷 56-60页

作者： Fan, Jinglian Zhao, Muyue xu, guofu Central-South University of Technology, Changsha 410083, China

The breakage mechanism of W-Ni-Fe alloy in the process of electro-heat upsetting studied both theoretically and experimetnally, and also the behaviors of crack formation and propagation were analysed. Alloy suffers from corrosion and thermal-mechanical fatigue mutual function. Simultaneously, the practical ways to improve the anvil life was discussed.

关键词： electro-heat upsetting anvil heavy metal thermal-mechanical fatigue corrosion fatigue

Dispersion-limited versus power-limited terahertz communication links using solid core subwavelength dielectric fibers

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Photonics Research 2020年第11期8卷 1757-1775页

作者： Kathirvel Nallappan Yang Cao guofu xu Hichem Guerboukha ChaheNerguizian Maksim Skorobogatiy Department of Electrical Engineering Polytechnique MontrealMontrealQuebec H3T1J4Canada Department of Engineering Physics Polytechnique MontrealMontrealQuebec H3T1J4Canada School of Engineering Brown UniversityProvidenceRhode Island 02912USA

Terahertz(THz)band(0.1–10 THz)is the next frontier for ultra-high-speed communication ***,most of communications research in this spectral range is focused on wireless systems,while waveguide/fiber-based links have been less *** free space communications have several advantages such as convenience in mobility for the end user,as well as easier multi-device interconnectivity in simple environments,fiber-based communications provide superior performance in certain short-range communication applications such as multi-device connectivity in complex geometrical environments(ex.,intra-vehicle connectivity)and secure communications with low probability of eavesdropping,as well as secure signal delivery to hard-to-reach or highly protected *** this work,we present an in-depth experimental and numerical study of the short-range THz communications links that use subwavelength dielectric fibers for information transmission and define the main challenges and trade-offs in the link ***,we use air or foam-cladded polypropylene-core subwavelength dielectric THz fibers of various diameters(0.57–1.75 mm)to study link performance as a function of the link length of up to∼10 m,and data bit rates of up to 6 Gbps at the carrier frequency of 128 GHz(2.34 mm wavelength).We find that depending on the fiber diameter,the quality of the transmitted signal is mostly limited either by the modal propagation loss or by the fiber velocity dispersion(GVD).An error-free transmission over 10 m is achieved for the bit rate of 4 Gbps using the fiber of smaller 0.57 mm ***,since the fields of subwavelength fibers are weakly confined and extend deep into the air cladding,we study the modal field extent outside of the fiber core,as well as fiber bending ***,the power budget of the rod-in-air subwavelength THz fiber-based links is compared to that of free space communication links,and we demonstrate that fiber links o

关键词： communication fiber power

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非绝热和乐量子计算研究进展

科学通报 2021年第16期66卷 1935-1945页

作者：赵培茈许国富仝殿民山东大学物理学院济南250100

量子计算的实际应用依赖于高保真度的量子门,而获得高保真度量子门所面临的两个主要挑战是克服系统的控制误差和环境噪声.几何相仅依赖于系统的演化路径而与演化速度等细节无关,因此基于几何相设计的量子门具有对控制误差的鲁棒性.特别... 详细信息

量子计算的实际应用依赖于高保真度的量子门,而获得高保真度量子门所面临的两个主要挑战是克服系统的控制误差和环境噪声.几何相仅依赖于系统的演化路径而与演化速度等细节无关,因此基于几何相设计的量子门具有对控制误差的鲁棒性.特别是,基于非绝热非阿贝尔几何相设计的非绝热和乐(holonomic)门具有完全的几何性质并且不受绝热条件的限制,受到了人们的广泛关注.自2012年首次提出以来,非绝热和乐量子计算取得了很大的进展:人们逐步改进了非绝热和乐量子计算的设计理论,使得非绝热和乐门的设计不断优化;发展了抗退相干的非绝热和乐量子计算,使得量子门既能抵抗控制误差又能抵抗退相干;构建了基于各种具体物理系统的非绝热和乐量子计算方案,并且在实验上成功演示了非绝热和乐门.本文回顾了非绝热和乐量子计算的主要理论进展,并简要介绍了物理实现和实验工作.

关键词：几何相非阿贝尔几何相量子门非绝热和乐量子计算