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Exact Entanglement Dynamics in Three Interacting Qubits

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Chinese Physics Letters 2018年第11期35卷 11-15页

作者： wen-Bin He Xi-wen guan State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 University of Chinese Academy of Sciences Beijing 100049 Center for Cold Atom Physics Chinese Academy of Sciences Wuhan 430071 Department of Theoretical Physics Research School of Physics and Engineering Australian National University Canberra ACT 0200 Australia

Motivated by recent experimental studies on coherent dynamics transfer in three interacting atoms or electron spins [Phys. Rev. Lett 114（2015） 113002, Phys. Rev. Lett 120（2018） 243604], here we study entanglement entropy transfer in three interacting qubits. We analytically calculate time evolutions of wave function, density matrix and entanglement of the system. We find that initially entangled two qubits may alternatively transfer their entanglement entropy to other two qubit pairs. Thus dynamical evolution of three interacting qubits may produce a genuine three-partite entangled state through entanglement entropy transfers. In particular, different pairwise interactions of the three qubits endow symmetric and asymmetric evolutions of the entanglement transfer,characterized by the quantum mutual information and concurrence. Finally, we discuss an experimental proposal of three Rydberg atoms for testing the entanglement dynamics transfer of this kind.

关键词： Exact Entanglement Dynamics in Three Interacting Qubits

Momentum distribution and non-local high order correlation functions of 1D strongly interacting Bose gas

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Chinese Physics B 2018年第7期27卷 138-151页

作者： EJKP Nandani Xi-wen guan Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China University of Chinese Academy of Sciences Beijing 100049 China Department of Mathematics University of Ruhuna Matara 81000 Sri Lanka Department of Theoretical Physics Research School of Physics and Engineering Australian National University Canberra ACT 0200 Australia

The Lieb-Liniger model is a prototypical integrable model and has been turned into the benchmark physics in theoretical and numerical investigations of low-dimensional quantum systems. In this note, we present various methods for calculating local and nonlocal M-particle correlation functions, momentum distribution, and static structure factor. In particular, using the Bethe ansatz wave function of the strong coupling Lieb-Liniger model, we analytically calculate the two-point correlation function, the large moment tail of the momentum distribution, and the static structure factor of the model in terms of the fractional statistical parameter a = 1 - 2/γ, where γ, is the dimensionless interaction strength. We also discuss the Tan＇s adiabatic relation and other universal relations for the strongly repulsive Lieb-Liniger model in terms of the fractional statistical parameter.

关键词： correlation function momentum distributions structure factor contact

Classification of extremely red objects in the Hubble Ultra Deep Field

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Chinese Journal of Astronomy and Astrophysics 2009年第1期9卷 59-72页

作者： guan-wen Fang Xu Kong Min Wang Center for Astrophysics University of Science and Technology of China Hefei 230026 China Joint Institute for Galaxy and Cosmology （JOINGC） of S HAO and USTC

We present a quantitative study of the classification of Extremely Red Objects （EROs）. The analysis is based on the multi-band spatial- and ground-based observations （HST/ACS-BViz, HST/NICMOS-JH, VLT-JHK） in the Hubble Ultra Deep Field （UDF）. Over a total sky area of 5.50 arcmin2 in the UDF, we select 24 EROs with the color criterion （i - K）vega 〉 3.9, corresponding to （I - K）vega 〉～4.0, down to Kvega = 22. We develop four methods to classify EROs into Old passively evolving Galaxies （OGs） and Dusty star-forming Galaxies （DGs）, including （i - K） vs. （J - K） color diagram, spectral energy distribution fitting method, Spitzer MIPS 24 um image matching, and nonparametric measure of galaxy morphology, and found that the classification results from these methods agree well. Using these four classification methods, we classify our EROs sample into 60Gs and 8 DGs to KVega 〈 20.5, and 80Gs and 16 DGs to KVega 〈 22, respectively. The fraction of DGs increases from 8/14 at KVega 〈 20.5 to 16/24 at KVega 〈 22. TO study the morphology of galaxies with its wavelength, we measure the central concentration and the Gini coefficient for the 24 EROs in our sample in HST/ACS-i, z and HST/NICMOS-J, H bands. We find that the morphological parameters of galaxies in our sample depend on the wavelength of observation, which suggests that caution is necessary when comparing single wavelength band images of galaxies at a variety of redshifts.

关键词： galaxies evolution - galaxies fundamental parameters - galaxies highredshift - cosmology observations

Quantum dynamics of Gaudin magnets

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Communications in Theoretical Physics 2022年第9期74卷 39-48页

作者： wen-Bin He Stefano Chesi Hai-Qing Lin Xi-wen guan Beijing Computational Science Research Center Beijing 100193China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsAPMChinese Academy of SciencesWuhan 430071China The Abdus Salam International Center for Theoretical Physics Strada Costiera 11I-34151 TriesteItaly Department of Physics Beijing Normal UniversityBeijing 100875China NSFC-SPTP Peng Huanwu Center for Fundamental Theory Xi’an 710127China Department of Theoretical Physics Research School of Physics and EngineeringAustralian National UniversityCanberra ACT 0200Australia

Quantum dynamics of many-body systems is a fascinating and significant subject for both theory and *** question of how an isolated many-body system evolves to its steady state after a sudden perturbation or quench still remains *** this paper,using the Bethe ansatz wave function,we study the quantum dynamics of an inhomogeneous Gaudin *** derive explicit analytical expressions for various local dynamic quantities with an arbitrary number of flipped bath spins,such as:the spin distribution function,the spin-spin correlation function,and the Loschmidt *** also numerically study the relaxation behavior of these dynamic properties,gaining considerable insight into coherence and entanglement between the central spin and the *** particular,we find that the spin-spin correlations relax to their steady value via a nearly logarithmic scaling,whereas the Loschmidt echo shows an exponential relaxation to its steady *** results advance the understanding of relaxation dynamics and quantum correlations of long-range interacting models of the Gaudin type.

关键词： Gaudin magnets central spin model Bethe ansatz spin polarization spin-spin correlation Loschmidt echo

Theoretical Studies on the Reaction Mechanism of AsCl_3 with H_2 in the Vapor Phase Epitaxy of GaAs

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Chinese Journal of Structural Chemistry 2007年第3期26卷 267-272页

作者： MA Lin guan wen-Jia XU Chang-Zhi SUN Ren-An School of Chemistry and Chemical Engineering Liaoning Normal University Dalian 116029 China School of Pharmaceutical Science Sun Yat-sen University Guangzhou 510080 China

The reaction mechanism of AsCl3 with H2 has been studied by using the method of BHandHLYP in Density Functional Theory （DFT） at the 6-31 1G^＊＊ basis set. The transition state of each reaction is verified via the analysis of vibration mode and Intrinsic Reaction Coordinate （IRC）. Meanwhile, single-point energy has been calculated at the QCISD（T）/6-311^G＊＊ level, and the zero-point energy correction has been made to the total energy and reaction energy barrier. It shows that AsCl3 reacts with H2 to first result in AsHCl2 which may incline to self-decompose and finally afford the product As2, or continue to react with H2 to provide the product ASH3. The computing result demonstrates that the former is the main reaction channel.

关键词： AsCl3/H2 transition state DFT

Excitation spectra of one-dimensional spin-1/2 Fermi gas with an attraction

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Communications in Theoretical Physics 2022年第12期74卷 154-175页

作者： Jia-Feng Pan Jia-Jia Luo Xi-wen guan State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China Department of Fundamental and Theoretical Physics Research School of PhysicsAustralian National UniversityCanberra ACT 0200Australia University of Chinese Academy of Sciences Beijing 100049China NSFC-SPTP Peng Huanwu Center for Fundamental Theory Xi'an 710127China

Using an exact Bethe ansatz solution,we rigorously study excitation spectra of the spin-1/2 Fermi gas(called Yang–Gaudin model)with an attractive *** excitations of this model involve particle-hole excitation,hole excitation and adding particles in the Fermi seas of pairs and unpaired *** gapped magnon excitations in the spin sector show a ferromagnetic coupling to the Fermi sea of the single *** numerically and analytically solving the Bethe ansatz equations and the thermodynamic Bethe ansatz equations of this model,we obtain excitation energies for various polarizations in the phase of the Fulde–Ferrell–Larkin–Ovchinnikov-like *** a small momentum(long-wavelength limit)and in the strong interaction regime,we analytically obtained their linear dispersions with curvature corrections,effective masses as well as velocities in particle-hole excitations of pairs and unpaired *** a type of particle-hole excitations display a novel separation of collective motions of bosonic modes within paired and unpaired ***,we also discuss magnon excitations in the spin sector and the application of Bragg spectroscopy for testing such separated charge excitation modes of pairs and single fermions.

关键词： Yang-Gaudin model quantum integrability the Bethe ansatz excitation spectrum

Clinical characteristics of COVID-19 in family clusters: a systematic review

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World Journal of Pediatrics 2021年第4期17卷 355-363页

作者： wen-Liang Song Ning Zou wen-He guan Jia-Li Pan Wei Xu Department of Pediatrics Shengjing Hospital of China Medical UniversityNo.36SanHao StreetShenyang110004China

Background Coronavirus disease 2019(COVID-19)caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has spread around the world and reports of children during early epidemic period showed features of family *** aim of this study is to assess clinical profiles of COVID-19 in family clusters with *** We performed a systematic literature review of English database(PubMed,Web of Science)and Chinese database(“***”,“***”and“***”)to identify papers on family clusters of COVID-19 with children and their family *** Eighteen studies involving 34 children and 98 adults from 28 families were ***,cough and ground-grass opacity change of chest computed tomography(CT)were the dominant features,whereas proportion of asymptomatic infections for children was higher than adults with statistical significance(32.4%and 13.3%,respectively,Pwenty-seven families reported adults as first case of COVID-19 in family *** The same virus strain can cause milder disease in children compared with their *** of COVID-19 were infected by adults in family during the early epidemic *** patients can transmit the virus.

关键词： Children Coronavirus disease 2019 Family clusters Severe acute respiratory syndrome coronavirus 2

Covalent modification of multiwalled carbon nanotubes with a low molecular weight chitosan

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Chinese Chemical Letters 2007年第3期18卷 361-364页

作者： Gang Ke wen Chao guan Chang Yu Tang Zhen Hu wen Jie guan Dan Lin Zeng Feng Deng Department of Chemistry Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Cellulose and Lignocellulosics Chemistry Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou 510650 China Department of Physics Wuhan University Wuhan 430072 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China

Covalent modification of shortened multiwalled carbon nanombes （MWNTs） with a natural low molecular weight chitosan （LMCS） was accomplished by the nucleophilic substitution reaction. The LMCS modified MWNTs （MWNT-LMCS） were characterized by FTIR, solid-state ^13C NMR, and XPS spectroscopies, thermogravimetric analysis, and transmission electron microscopy. The results revealed that amino and primary hydroxyl groups of the LMCS participated mainly in the formation of the MWNT-LMCS conjugates. The MWNT-LMCS consists of 58 wt.% LMCS, and about four molecular chains of the LMCS were attached to 1000 carbon atoms of the nanotube sidewalls. As a novel derivative of the MWNTs, the MWNT-LMCS not only solved in DMF, DMAc and DMSO, but also in aqueous acetic acid solution.

关键词： Carbon nanotubes Chitosan Renewable resources Modification

Effects of impurity elements on SiC grain boundary stability and corrosion

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Nuclear Science and Techniques 2021年第11期32卷 77-95页

作者： Jun Hui Bao-Liang Zhang Tao Liu Min Liu wen-guan Liu Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China China Institute of Atomic Energy Beijing 102413China

Grain boundaries(GBs)have critical influences on the stability and properties of various *** this study,first-principles calculations were performed to determine the effects of four metallic impurities(Ni,Al,Bi,and Pb)and three nonmetallic impurities(H,O,and N)on the GBs of silicon carbide(SiC),using the ∑5(210)GBs as *** GB energy and segregation energy(SE)were calculated to identify the effects of impurities on the GB *** interactions considerably influenced the bonding effects of *** formation of weak bonds resulted in the corrosion and embrittlement of *** co-segregation of Bi,Pb,and O was also investigated in detail.

关键词： SiC First-principles calculation Grain boundary Impurity atom Co-segregation