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Absence of State Collapse and Revival in a Superconducting Charge Qubit

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Communications in Theoretical Physics 2007年第12期48卷 1029-1032页

作者： HUO Wen-Yi~1 and LONG Gui-Lu~(1,2,3)~1 Department of Physics amd key laboratory for Quantum Information and Measurements,Tsinghua University,Beijing100084,China~2 key laboratory for atomic and molecular nanosciences,Tsinghua University,Beijing 100084,China~3 National laboratory for Information Science and Technology,Hsinghua University,Beijing 100084,China Department of Physics amd key laboratory for Quantum Information and Measurements Tsinghua University Beijing 100084 China key laboratory for atomic and molecular nanosciences Tsinghua University Beijing 100084 China National laboratory for Information Science and Technology Hsinghua University Beijing 100084 China

The Hamiltonian of a superconducting charge qubit with a configuration of dc SQUID contains an interac-tion between the LC oscillator part and charge *** interaction may leads to quantum state collapse and revivalwhich degrades the charge qubits and leads to serious *** analysis shows that the existing charge qubitparameters do not lead to this phenomenon,which is very good for the superconducting charge

关键词： quantum computer superconducting charge qubit absence and revival

Experimental and calculated momentum densities for the complete valence orbitals of the antimicrobial agent diacetyl

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Chinese Physics B 2005年第10期14卷 1966-1973页

作者：苏国林任雪光张书锋宁传刚周晖李彬李桂琴邓景康 Department of Physics Key Laboratory of Atomic and Molecular NanoSciences Ministry of Education Tsinghua University Beijing 100084 China

The first electronic structural study of the complete valence shell binding energy spectra of the antimicrobial agent diacetyl, encompassing both the outer and inner valence regions, is reported. The binding energy spectra as well as the individual orbital momentum profiles have been measured by using a high resolution （e, 2e） electron momentum spectrometer （EMS） at an impact energy of 1200eV plus the binding energy, and using symmetric noncoplanar kinematics. The experimental orbital electron momentum profiles are compared with self-consistent field （SCF） theoretical profiles calculated using the Hartree-Fock approximation and Density Functional theory predictions in the target Kohn-Sham approximation which includes some treatment of correlation via the exchange and correlation potentials with a range of basis sets. The pole strengths of the main ionization peaks from the inner valence orbitals are estimated.

关键词： diacetyl ionization energy electron momentum profiles electron correlation effects

Accurate calculation of the potential energy curve and spectroscopic parameters of X^2Σ^+ state of ^(12)Mg^1H

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Chinese Physics B 2015年第4期24卷 170-174页

作者：伍冬兰谭彬谢安东闫冰丁大军 Institute of atomic and molecular Physics Jilin University College of Mathematics and Physics Jinggangshan University Jilin Provincial key laboratory of Applied atomic and molecular Spectroscopy Jilin University

High level calculations on the ground state of 12Mg1H molecule have been performed using multi-reference configuration interaction （MRCI） method with the Davidson modification. The core-valence correlation and scalar relativistic corrections are included into the present calculations at the same time. The potential energy curve （PEC） of the ground state, all of the vibrational levels and spectroscopic parameters are fitted. The results show that the levels and spectroscopic parameters are in good agreement with the available experimental data. The analytical potential energy function （APEF） is also deduced from the calculated PEC using the Murrell-Sorbie （M-S） potential function. The present results can provide a helpful reference for the future spectroscopic experiments or dynamical calculations of the molecule.

关键词： multi-reference configuration interaction potential energy curve analytical potential energy function spectroscopic parameters

Quantum Motion of Atoms in a Magnetic Waveguide

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Chinese Physics Letters 2001年第6期18卷 724-726页

作者： LIU Xia-Ji LI Dai-Jun WANG De-Zhong HUANG Hu LI Shi-Qun WANG Yu-Zhu key laboratory for Quantum Information and Measurements of Education Ministry Department of Physics and Center for Atomic and Molecular NanosciencesTsinghua UniversityBeijing 100084 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800

Based on the magnetic atomic guidance model proposed in our previous paper[***.160(1999)72],the quantum motion of atoms in a magnetic tube is discussed in *** non-adiabatic loss of atoms as result of spin-flip transition and the adiabatic condition for keeping atoms in the guidable state are also *** result shows that the atoms can be guided in the magnetic waveguide with a higher guiding efficiency by choosing suitable parameters of the magnetic tube.

关键词： waveguide Waveguide adiabatic

Quantum interference of a time-dependent wave packet of atom irradiated by an ultra-short laser pulse

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Chinese Physics B 2020年第1期29卷 223-228页

作者： Wen-Min Yan Ji-Gen Chen Jun Wang Fu-Ming Guo Yu-Jun Yang Institute of atomic and molecular Physics Jilin UniversityChangchun 130012China Jilin Provincial key laboratory of Applied atomic and molecular SpectroscopyJilin University Changchun 130012China Zhejiang Provincial key laboratory for Cutting Tools Taizhou UniversityTaizhou 318000China

The wave packet evolution of an atom irradiated by an intense laser pulse is systematically investigated by using the numerical solution of the time-dependent Schr?dinger *** are two types of spatial interference structures in the time-dependent evolution of the atomic wave *** the increasing of the evolution time,the interference fringe spacing for typeⅠ(typeⅡ)becomes larger(smaller).As the wavelength of the incident laser increases,the interference of the wave packet is changed from typeⅡto typeⅠ,and the shift of interference type can be attributed to the contribution of excited states by using the energy analysis of the time-dependent wave function.

关键词： high-order harmonic generation above-threshold ionization

Simulation of general three-body interactions in a nuclear magnetic resonance ensemble quantum computer

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Science China(Physics,Mechanics & Astronomy) 2008年第8期51卷 1089-1096页

作者： LIU WenZhang ZHANG JingFu DENG ZhiWei LONG GuiLu key laboratory of atomic and molecular nanosciences and Department of Physics Tsinghua UniversityBeijing 100084China Tsinghua National laboratory for Information Science and Technology Beijing 100084China Testing and Analytical Center Beijing Normal UniversityBeijing 100875China

Three-body interaction plays an important role in many-body physics, and quantum computer is efficient in simulating many-body interactions. We have experimentally demonstrated the general three-body interactions in a three-qubit nuclear magnetic resonance ensemble quantum computer. Using a nuclear magnetic resonance computer we implemented general forms of three-body interactions including σ x 1 σ z 2 σ x 3 and σ x 1 σ z 2 σ y 3 The results show good agreement between theory and experiment. We have also given a concise and practical formula for a general n-body interaction in terms of one-and two-body interactions.

关键词： nuclear magnetic resonance quantum computer general three-body interaction ensemble quantum computer

Suppression of Amplitude Decoherence in Arbitrary n-Level Atom in -Configuration with Bang-Bang Controls

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Communications in Theoretical Physics 2008年第6期49卷 1432-1434页

作者： WANG Yan-Hui LIU Xiao-Shu LONG Gui Lu key laboratory for atomic and molecular nanosciences and Department of Physics Tsinghua University Beijing 100084 China Tsinghua National laboratory for Information Science and Technology Beijing 100084 China Institute of Microelectronics Tsinghua University Beijing 100084 China

In this paper, we give Bang-Bang （BB） decoupling schemes to suppress the amplitude decoherence in the five-and six-level atom systems in ≡-configuration. We generalize this scheme to the arbitrary level atom system... 详细信息

关键词： Bang-Bang control amplitude decoherence ≡-configuration

Influence of the reagent vibration on the stereodynamics of the reactions D^-+H_2 and H^-+D_2

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Chinese Physics B 2012年第2期21卷 266-271页

作者： Chen Xiao-Qiong Wang Mei-Shan Yang Chuan-Lu Wu Ji-Cheng School of Physics Key Laboratory of Atomic and Molecular Physics of Shandong ProvinceLudong UniversityYantai 264025China

Employing the quasi-classical trajectory method and the potential energy surface of Panda and Sathyamurhy [Panda A N and Sathyamurthy N 2004 J. Chem. Phys. 121 9343], the effect of the reagent vibration on vector correlation of the ion-molecule reactions D- ＋ H2 and H- ＋ D2 is studied at a collision energy of 35.7 kcal/mol. Four generalized polarization-dependent differential cross sections （2π/σ）（dσ00/dωt）, （2π/σ）（dσ20/dσ20）, （27π/σ）（dσ22＋/dwt）, and （2π/σ）（dπ/σ） are presented in the centre-of-mass reference frame, separately. At the same time, the effects on the product angular distributions P（θr）, P（~r） and P（Oφ） of the title reactions are also analysed. The calculated results show that the scattering tendencies of the product HD, the alignment and the orientation of j^1 sensitively depend on reagent molecule vibration.

关键词： quasi-classical trajectory generalized polarization dependent differential cross sections,stereodynamics vector correlation

Ultrafast dynamics of cationic electronic states of vinyl bromide by strong-field ionization-photofragmentation

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Chinese Physics B 2022年第2期31卷 641-645页

作者： Long-Xing Zhou Yang Liu Shen He Da-Shuai Gao Xing-Chen Shen Qi Chen Tao Yu Hang Lv Hai-Feng Xu Institute of atomic and molecular Physics Jilin UniversityChangchun 130012China Jilin Provincial key laboratory of Applied atomic and molecular Spectroscopy Jilin UniversityChangchun 130012China

Strong field ionization-photofragmentation(SFI-PF)with ultrafast pump–probe scheme is a powerful approach to study the dynamics of molecular cationic electronic *** we carry out a SFI-PF study on the cationic electronic states of vinyl bromide,C_(2)H_(3)*** yields of the parent C_(2)H_(3)Br_(+)and the formation of the fragment(Br^(+),C_(2)H^(+)2 and C_(2)H^(+)3)ions have been measured at different pump–probe delay *** provides experimental evidence of A^(2)A'–X^(2)A'' internal conversion of vinyl bromide cations which occurs in a time of about 220 fs,and the time of C_(2)H_(3)^(+) formation induced by the dissociation of the A^(2)A' state around 300 *** study would add our knowledge of the behavior of electronic excited states of complex molecular cations.

关键词： strong field ionization ultrafast dynamics vinyl bromide cation