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Realization of arbitrary two-qubit quantum gates based on chiral Majorana fermions

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Chinese Physics B 2021年第4期30卷 43-54页

作者： qing yan qing-Feng Sun International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Quantum Matter Beijing 100871China Beijing Academy of Quantum Information Sciences Beijing 100193China

Quantum computers are in hot-spot with the potential to handle more complex problems than classical computers *** the quantum computation requires the universal quantum gate set {T,H,CNOT} so as to perform any unitary transformation with arbitrary *** we first briefly review the Majorana fermions and then propose the realization of arbitrary two-qubit quantum gates based on chiral Majorana *** cells consist of a quantum anomalous Hall insulator surrounded by a topological superconductor with electric gates and quantum-dot structures,which enable the braiding operation and the partial exchange *** defining a qubit by four chiral Majorana fermions,the singlequbit T and H quantum gates are realized via one partial exchange operation and three braiding operations,*** entangled CNOT quantum gate is performed by braiding six chiral Majorana ***,we design a powerful device with which arbitrary two-qubit quantum gates can be realized and take the quantum Fourier transform as an example to show that several quantum operations can be performed with this space-limited ***,our proposal could inspire further utilization of mobile chiral Majorana edge states for faster quantum computation.

关键词： quantum computation T gate CNOT gate braiding chiral Majorana fermions

1-quasiconformal mappings on a (2,2)-type quadric

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Applied Mathematics(A Journal of Chinese Universities) 2009年第1期24卷 65-75页

作者： WU qing-yan Dept. of Math. Zhejiang Univ. Hangzhou 310027 China

This paper gets the Beltrami equations satisfied by a 1-quasiconformal mapping, which are exactly CR or anti-CR equations on （2,2）-type quadric Q0. This means a 1-quasiconformal mapping on Q0 is CR or anti-CR. This reduces the determination of 1- quasiconformal mappings to a problem on the theory of several complex analysis. The result about the group of CR automorphisms is used to determine the unit component of group of 1-quasiconformal mappings.

关键词： Beltrami equation quasiconformal mapping quadric CR automorphism

Anomalous Josephson current in quantum anomalous Hall insulator-based superconducting junctions with a domain wall structure

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Chinese Physics B 2020年第9期29卷 487-497页

作者： qing yan yan-Feng Zhou qing-Feng Sun International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Department of Physics University of Texas at DallasRichardsonTexas 75080USA CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

We theoretically study the Josephson effect in a quantum anomalous Hall insulator(QAHI)nanoribbon with a domain wall structure and covered by the *** anomalous Josephson current,the nonzero supercurrent at the zero superconducting phase difference,appears with the nonzero magnetization and the suitable azimuth angle of the domain *** on the configuration of the domain wall,the anomalous current peaks in the Bloch type but disappears in the Néel type because the y-component of magnetization is necessary to break symmetry to arouse the anomalous *** phase shift of the anomalous current is tunable by the magnetization,the azimuth angle,or the thickness of the domain *** introducing a bare QAHI region in the middle of the junction which is not covered by the superconductor,the anomalous Josephson effect is enhanced such that the phase shift can exceedπ.Thus,a continuous change between 0 andπjunctions is realized via regulating the configuration of the domain wall or the magnetization *** long as an s-wave superconductor is placed on the top of the QAHI with a domain wall structure,this proposal can be experimentally fabricated and useful for the phase battery or superconducting quantum bit.

关键词： anomalous Josephson current quantum anomalous Hall insulator domain wall Josephson junction

Laws of the Iterated Logarithm for High-Dimensional Wiener Sausage

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Acta Mathematica Sinica,English Series 2011年第8期27卷 1599-1610页

作者： yan qing WANG Fu qing GAO School of Mathematics and Statistics Wuhan University Wuhan 430072 P. R. China

Let {β（s）,s ≥ O} be the standard Brownian motion in R^d with d ≥ 4 and let ｜Wr（t）｜ be the volume of the Wiener sausage associated with {β（s）, s ≥ O} observed until time t. Prom the central limit theorem of Wiener sausage, we know that when d ≥ 4 the limit distribution is normal. In this paper, we study the laws of the iterated logarithm for ｜Wr（t）｜ - e｜Wr（t）｜ in this case.

关键词： Wiener sausage Kolmogorov's law of the iterated logarithm Chung's law of the iterated logarithm

Levels and statistical analysis of aerosol phase PAHs over qingdao alongshore

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第7期8卷 1164-1169页

作者： ZHANG yan-qing WANG yan TAN Pei-gong Department of Environmental Science and Engineering Ocean University of China Qingdao 266033 China Institute of Environment and Municipal Engineering Qingdao Technological University Qingdao 266033 China qingdao Environmental Protection Agency Qingdao 266033 China

Atmospheric concentrations of polycyclic aromatic hydrocarbons (PAHs) were measured during various seasons at six different cities/locations in qingdao alongshore. The annual average PAHs concentration ranged from 16 ng/m3 (at a clean com- pared site) to 308 ng/m3 (in an industry site). The average total particulate PAHs concentration was 74.5 ng/m3 with a higher concentration of particulate PAHs in winter. Based on a year-round dataset, the sources of PAHs in the air of qingdao were drawn by principal factor analysis and correlation analysis. The results indicated that vehicle emissions and oil burning were the main source of PAHs in qingdao alongshore.

关键词： Polycyclic aromatic hydrocarbons (PAHs) Atmosphere aerosol Factor analysis Correlation analysis

Study on the local time asymmetry of the Earth's ring currents based on multiple low-Earth-orbit satellite magnetic observations

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Science China(Technological Sciences) 2024年第11期67卷 3354-3364页

作者： OU JiaMing JIANG Yi yan qing State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 999078China Macao Institute of Space Technology and Application Macao 999078China Zhuhai MUST Science and Technology Research Institute Macao University of Science and TechnologyZhuhai 519085China

The azimuthal morphology of Earth's ring currents has consistently shown asymmetry during extreme space weather events at low latitudes,particularly during geomagnetic storms.A dawn-dusk pattern has been detected during the storm main phase through near-Earth and in-situ magnetic *** asymmetry is believed to arise from asymmetric solar windmagnetosphere coupling and is linked to the closure of the ring *** evidence has confirmed the existence of asymmetric ring currents during quiet times and the storm recovery *** phenomenon may be closely related to the evolution of ring currents,including plasma injection and decay *** this study,the local time asymmetry of the ring current is estimated using data from low-Earth-orbit Swarm and Macao Science Satellite-1(MSS-1)*** harmonics models are developed to quantify the magnetic field of ring currents through external Gauss coefficients during both quiet periods and the storm recovery *** features of dawn-dusk asymmetry are observed in various cases in different months.(1)The maximum difference in magnetic value across local time ranges from 3 to 10 nT,showing relative invariance compared with various Sym-H levels.(2)Stronger magnetic signals are detected at the premidnight sector during quiet times and at the afternoon sector during the storm recovery phase.(3)Magnetic perturbations remain at a lower level during the postmidnight and morning *** the pattern of local time asymmetry differs between quiet times and the recovery phase,dawn-dusk asymmetry remains the most pronounced feature,affecting the trapping and loss of charged particles in the inner *** Swarm and MSS-1 magnetic observations can enable convenient monitoring of the detailed azimuthal local time effects of the ring current at various disturbance levels in the future.

关键词： Earth's ring currents local time asymmetry SHA model Macao Science Satellite-1

Synthesis and Crystal Structure of a Coordination Polymer {[Co(phth)(phen)(H_2O)]·(C_2H_5OH)}_n

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Chinese Journal of Structural Chemistry 2006年第10期25卷 1193-1196页

作者： GAO Ling CHENG qing-yan WANG yan-Ji Hebei University of Technology Tianjin 300130 China

The coordination polymer {[Co（phth）（phen）（H2O）]·（C2H5OH）}n （phth = phthalate, phen = 1,10-phenanthroline） with formula C22H2OCoN2O6 （Mr = 467.33） was synthesized by the solvothermal method under low temperature, and its crystal structure was determined by singlecrystal X-ray diffraction. The complex belongs to monoclinic system, space group P21/n with a = 12.7352（16）, b = 8.8125（11）, c = 18.677（2） °A, β= 102.633（2）°, V = 2045.3（4）°A^3 Z = 4, Dc= 1.518 g/cm^3,μ = 0.882 mm^-1, F（000） = 964, S = 1.053, the final R = 0.0401 and wR = 0.0984 for 3135 observed reflections （I〉 2σ（I））. Single-crystal X-ray analysis revealed that the Co（Ⅱ） ion is six-coordinated. The cobalt complex forms a one-dimensional chain structure via phthalate bridging ligand. In the cobalt complex, a 3D network structure is formed by π-π stacking interaction of 1,10-phenanthroline as well as intermolecular hydrogen bonding interactions.

关键词： cobalt complex solvothermal method π-π stacking hydrogen bond

Enteric glial cells and their role in the intestinal epithelial barrier

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World Journal of Gastroenterology 2014年第32期20卷 11273-11280页

作者： yan-Bo Yu yan-qing Department of Gastroenterology Qilu Hospital Shandong University

The intestinal epithelium constitutes a physical and functional barrier between the external environment and the host organism. It is formed by a continuous monolayer of intestinal epithelial cells maintained together by intercellular junctional complex, limiting access of pathogens, toxins and xenobiotics to host tissues. Once this barrier integrity is disrupted, inflammatory disorders and tissue injury are initiated and perpetuated. Beneath the intestinal epithelial cells lies a population of astrocyte-like cells that are known as enteric glia. The morphological characteristics and expression markers of these enteric glia cells were identical to the astrocytes of the central nervous system. In the past few years, enteric glia have been demonstrated to have a trophic and supporting relationship with intestinal epithelial cells. Enteric glia lesions and/or functional defects can be involved in the barrier dysfunction. Besides, factors secreted by enteric glia are important for the regulation of gut barrier function. Moreover, enteric glia have an important impact on epithelial cell transcriptome and induce a shift in epithelial cell phenotype towards increased cell adhesion and cell *** glia can also preserve epithelial barrier against intestinal bacteria insult. In this review, we will describe the current body of evidence supporting functional roles of enteric glia on intestinal barrier.

关键词： Enteric glia cells Intestinal epithelial cells Intestinal barrier function Tight junctions

Collision-induced Rotational Energy Transfer in an Atom-Diatom System

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Chinese Journal of Chemical Physics 2008年第5期21卷 457-462页

作者： yan-qing Ni Jian Li Feng-cai Ma Department of Physics Liaoning University Shenyang 110036 China Department of Science Shenyang Institute of Aeronautical Engineering Shengyang 110036 China

As a further theoretical study of the collision-induced quantum interference on rotational energy transfer in an atom-diatom system, based on the first-Born approximation of time-dependent perturbation theory, taking into account the anisotropic Lennard-Jones interaction potential and the long-range interaction potential, the differential interference angles in singlet-triplet mixed states of CO A^1Π（v=9）-e3∑-（v=1） system in collision with He, Ne, Ar, and other partners were calculated theoretically. The relationships of differential interference angle versus impact parameters, including collision parameter b and velocity, are obtained.

关键词： Rotational energy transfer Collision-induced quantum interference Interference angle