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Quantum simulation and quantum computation of noisy-intermediate scale

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Chinese Physics B 2022年第10期31卷 1-7页

作者： Kai xu heng Fan Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Beijing Academy of Quantum Information Sciences Beijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China CAS Center of Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

In the past years, great progresses have been made on quantum computation and quantum simulation. Increasing the number of qubits in the quantum processors is expected to be one of the main motivations in the next years, while noises in manipulation of quantum states may still be inevitable even the precision will improve. For research in this direction, it is necessary to review the available results about noisy multiqubit quantum computation and quantum simulation. The review focuses on multiqubit state generations, quantum computational advantage, and simulating physics of quantum many-body systems. Perspectives of near term noisy intermediate-quantum processors will be discussed.

关键词： quantum computation quantum simulation many-body physics quantum supremacy noisy intermediate-scale quantum technologies

Effect of hydrogen annealing on characteristics of polycrystalline silicon

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Rare Metals 2006年第z1期25卷 173-175页

作者： Gou Xianfang xu Ying LI xudong heng yang MA Lifen REN Bingyan Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Institute of Information Function Materials Hebei University of Technology Tianjin 300130 China

The characteristics of mc-Si used for solar cells during H2 ambient annealing at 800-1200 ℃ were investigated by means of FTIR and QSSPCD. The results reveal that grain boundaries or defects in mc-Si may facilitate the formation of oxygen precipitates, and the formation of oxygen precipitates has deleterious effect on the lifetime of mc-Si. Decreasing lifetime could result from the formation of new recombination during annealing. Additionally, It is found that hydrogen may facilitate the formation of oxygen precipitates in mc-Si. On the other hand, the diffusion of hydrogen may passivate the defects/boundaries and it is beneficial to the lifetime of mc-Si.

关键词： multi-crystalline silicon oxygen and carbon minority carrier lifetime annealing

Structural Optimization of Polyimide Foam via Composition with Hyperbranched Polymer Modified Fluorinated Carbon Nanotubes

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Chinese Journal of Polymer Science 2023年第1期41卷 117-128页

作者： Jian Liu Zhuang Nie Rui Qin An-Ping ou Tao Zhang xu Wang Xiang-yang Liu College of Polymer Science and Engineering State Key Laboratory of Polymer Material and EngineeringSichuan UniversityChengdu610065China Zhejiang Key Laboratory of Marine Materials and Protective Technologies Key Laboratory of Marine Materials and Related TechnologiesCASNingbo315000China

The key to improve the foam’s performance is to optimize the cellular structure and its bulk-material ***,the hyperbranched polymer modified fluorinated multi-walled carbon nanotube(HPMCNT-F)based on the nucleophilic reactions of MCNT-F was successfully prepared and used to composite with PI *** pristine MCNT shows a poor dispersity and weak interfacial interaction with PI *** HPMCNT-F exhibits an excellent dispersity and effectively forms covalent/non-covalent interaction with PI matrix due to the surface-structure engineering,resulting in the enhancement of the PI ***,HPMCNT-F works as a heterogeneous nucleation agent in PI foam to optimize the cellular *** enhancement of PI bulk and the optimizing of cellular structure result in the increase of compressive special strength of composite foam by 58.9%with a low loading of 1.6 wt%***,the hyperbranched polymers effectively prevent the thermal conduction among HPMCNT-F,and the isolated MCNTs effectively block thermal radiation through absorption and reflection the infrared ***,the thermal conductivity was reduced by 8.0%simultaneously.

关键词： Foams Nanocomposites Mechanical properties Thermal properties

Investigation of the SA evolution by using the CHAOS-4 model over 1997–2013

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Science China Earth Sciences 2016年第5期59卷 1041-1050页

作者： ou JiaMing DU AiMin xu WenYao Key Laboratory of Earth and Planetary Physics Chinese Academy of Sciences Institute of Geology and Geophysics Chinese Academy of Sciences

The temporal and spatial evolution characteristics of the geomagnetic secular acceleration(SA) are investigated, based on CHAOS-4 core field model during the period of 1997–2013. The SA evolution on a short time scale is associated with the phenomenon of the geomagnetic jerk. More details of the global extent and the occurrence time of the successive jerks(the 1999, 2003, 2007, and 2011 jerks) are obtained. The location, size and reversed polarity pattern for the 1999 jerk are similar to those for the 2003 jerk in the Asian-Indian sector. While the 2007 and 2011 jerks mainly take place in the Atlantic sector. The direction and speed of the shift for the four jerks are different, identified by the occurrence time of the jerks. The zonal motions of the SA patches exhibit an oscillation pattern in the Asian-Indian sector, whereas a purely westward drifting pattern is along the equator in the Atlantic sector. It is believed that the shift of the jerks is related to the motion of SA-B_r patches observed at the core-mantle boundary(CMB).

关键词： Geomagnetic secular acceleration Geomagnetic jerk Core-mantle boundary Zonal oscillation

Effect of Al_(2)O_(3)/SiO_(2) ratio on morphology of complex calcium ferrite

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Journal of Iron and Steel Research International 2023年第10期30卷 1921-1928页

作者： Dai-wei yang Wei Wang Jing-xuan Li xu-heng Chen Peng-fei Chen Jiangsu Yonggang Group Co. Ltd.IronworksSuzhou 215600JiangsuChina Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary Resources Wuhan University of Science and TechnologyWuhan 430081HubeiChina Beijing Zhiye Interconnection Technology Co. Ltd.Beijing 100144China

Al_(2)O_(3) and SiO_(2) greatly influence the formation of complex calcium ferrite,which is the main bonding phase in high basicity *** effects of Al_(2)O_(3)/SiO_(2) ratios on the morphology of complex calcium ferrite were *** main mineral phases in the samples with different Al_(2)O_(3)/SiO_(2) ratios were CaFe_(2)O_(4) with a solid solution of Si or Al atoms and the silico-ferrite of calcium and *** results showed that the morphology of the complex calcium ferrite changed from lumpy to plate-like and acicular with increases in the SiO_(2) content and the Al_(2)O_(3)/SiO_(2) *** the content of SiO_(2) was 4 wt.%,the main calcium ferrite morphology was acicular,and the number of macropores in the samples increased with the Al_(2)O_(3)/SiO_(2) ratio *** first-principles analysis of the calcium ferrite crystal structure showed that adding SiO_(2) and Al_(2)O_(3) changed the growth mechanism of the CaFe_(2)O_(4) crystal,promoting the formation of platy and acicular complex calcium *** size of calcium ferrite was significantly smaller due to the increase in CaO-Fe_(2)O_(3)-SiO_(2)-Al_(2)O_(3) viscosity with increasing the Al_(2)O_(3)/SiO_(2) ratio.

关键词： Complex calcium ferrite Silico-ferrite of calcium and aluminum Al_(2)O_(3)/SiO_(2)ratio Morphology First-principles calculation

Clinical and genomic analysis of baseline and acquired MET fusions with an intact kinase domain in lung cancer patients

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Genes & Diseases 2024年第1期11卷 76-79页

作者： Bo Jin Yutong Ma Qian Wu Qiuxiang ou yang Shao Shun xu Department of Medical Oncology The First Hospital of China Medical UniversityShenyangLiaoning 110001China Geneseeq Research Institute Nanjing Geneseeq Technology Inc.NanjingJiangsu 210000China School of Public Health Nanjing Medical UniversityNanjingJiangsu 211166China Department of Thoracic Surgery The First Hospital of China Medical UniversityShenyangLiaoning110001China

MET gene alterations in lung cancer patients mainly include exon 14 skipping and gene amplification,which are the key therapeutic targets and drive resistance to tyrosine kinase inhibitors(TKls).1 However,the structural variants of MET,such as MET fusions,are much rarer(0.26%),as reported in a Chinese non-small cell lung cancer(NSCLC)cohort.2 Several recurrent MET fusions,such as KIF5B-MET and HLADRB1-MET,were reported as oncogenic drivers and showed favorable responses to crizotinib.

关键词： lung patients alterations

Interactions between dislocations and twins in deformed titanium aluminide crystals

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Journal of Materials Science & Technology 2019年第3期35卷 402-408页

作者： Guang yang Shang-Yi Ma Kui Du Dong-Sheng xu Sen Chen yang Qi heng-Qiang Ye School of Materials Science and Engineering Northeastern University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Division of Titanium Alloys Institute of Metal Research Chinese Academy of Sciences Department of Materials Physics and Chemistry School of Materials Science and Engineering Northeastern University

Using scanning, transmission electron microscopy and aberration-corrected scanning transmission electron microscopy, we have studied the interactions between dislocations and twins in impact deformed polysynthetic twinned TiAl crystal. The 1/3 oundaries reveal the interactions of glissile 1/2 dislocations with the coherent twin *** abnormal stacking fault was found adjacent to the coherent twin boundary. It has the same stacking sequence but different atom species in the [110] direction with an additional displacement of 1/4[110]in two neighboring {111} layers, and is likely induced by the slip of a 1/12[112](i.e. 1/4[110] + 1/6[211])dislocation.

关键词： TiAl Dynamic deformation Twins Dislocations Abnormal stacking fault

Dynamical-Symmetry Breaking, Mechanism and Characterization Behaviour

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Chinese Physics Letters 2001年第5期18卷 625-627页

作者： xu Gong-ou xu Ming-Jie XING Yong-Zhong yang Ya-Tian Department of Physics Nanjing UniversityNanjing 210093 Department of Geoscience Nanjing UniversityNanjing 210093 Center of Theoretical Nuclear Physics National Laboratory of Heavy-Ion AcceleratorLanzhou 730000 Institute of Theoretical Physics Chinese Academy of SciencesBeijing 10008 Department of Physics Fujian Normal UniversityFuzhou 350007 Department of Physics Tianshui Normal CollegeTianshui 741000

The integrability of quantum systems is charactized by the algebraic notion of dynamical symmetry,hence the nonintegrability of quantum systems should be discussed topologically in reference to corresponding integrable ones.A topological approach is *** topological map in general is shown to be constituted of the piecewise diffeomorphic maps interrupted by sudden nondiffeomorphic maps and thus has the similar typical feature of stretching-folding stretching......as the Smale horse-shoe map.

关键词： topological stretching integrable

Langmuir-Blodgett Films of C_(60)-end-capped Poly(ethylene oxide)

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Chinese Journal of Polymer Science 2019年第6期37卷 604-608页

作者： Ke ou Xian xu Yu Shao Wei-Jie Wang Wen-Bin Zhang Shu-Guang yang Center for Advanced Low-dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Material Science and Engineering Donghua University Key Laboratory of Polymer Chemistry&Physics of Ministry of Education Center for Soft Matter Science and Engineering College of Chemistry and Molecular Engineering Peking University

Buckyballs(C_(60)) are linked to one end and two ends of linear poly(ethylene oxide)(PEO) chains through highly efficient click chemistry to obtain giant amphiphilic molecules C_(60)-PEO and C_(60)-PEO-C_(60), respectively. C_(60)-PEO and C_(60)-PEO-C_(60) molecules are spread on water surface and then transferred to solid substrates with Langmuir-Blodgett(LB) film deposition approach. C_(60)-PEO and C_(60)-PEO-C_(60) exhibit fractal growth behavior on the solid substrate under certain conditions owing to the crystallization ability of PEO segment. PEO chain length and the end capped mode both affect the fractal growth pattern.

关键词： LB film Giant amphiphilic molecule Fractal growth