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Spatial Splitting and Intensity Suppression of Four-Wave Mixing in V-Type Three-Level Atomic System 认领 引用 被引量：3
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作者 李创社 尹伟涛 +3 位作者 袁晨智 史美震 赵燕 张彦鹏 《Chinese Physics Letters》 SCIE EI CAS 2010年第4期140-142,共3页
We illustrate our experimental observation of coexisting the controllable spatial splitting and intensity suppression of four-wave mixing （FWM） beam in a V-type three-level atomic system. The peak number and separat... We illustrate our experimental observation of coexisting the controllable spatial splitting and intensity suppression of four-wave mixing （FWM） beam in a V-type three-level atomic system. The peak number and separation distance of the FWM beam are controlled by the intensities and frequencies of the laser beams, as well as atomic density. 展开更多
关键词 Atomic and molecular physics Optics quantum optics and lasers
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Preparation of Arbitrary Four-Qubit W State with Atomic Ensembles via Rydberg Blockade 认领 引用 被引量：3
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作者 韩阳 吴春旺 +3 位作者 高明 梁林梅 陈平形 李承祖 《Chinese Physics Letters》 SCIE EI CAS 2010年第4期33-36,共4页
The generation of various entangled states is an essential task in quantum information processing. Recently, a scheme （PRA 79, 022304） has been suggested for generating Greenberger-Horne-Zeilinger state and cluster ... The generation of various entangled states is an essential task in quantum information processing. Recently, a scheme （PRA 79, 022304） has been suggested for generating Greenberger-Horne-Zeilinger state and cluster state with atomic ensembles based on the Rydberg blockade. Using similar resources as the earlier scheme, here we propose an experimentally feasible scheme of preparing arbitrary four-qubit W class of maximally and non- maximally entangled states with atomic ensembles in a single step. Moreover, we carefully analyze the realistic noises and predict that four-qubit W states can be produced with high fidelity （F - 0.994） via our scheme. 展开更多
关键词 Atomic and molecular physics Computational physics Optics quantum optics and lasers Quantum information and quantum mechanics
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Corrections to atomic ground state energy due to interaction between atomic electric quadrupole and optical field 认领 引用
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作者 Jie Hu Yu Chen +3 位作者 Yi-Xiu Bai Pei-Song He Qing Sun An-Chun Ji 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第4期285-291,共7页
We study the ground state energy of an atom interacting with an oscillating optical field with electric dipole and quadrupole coupling.Under the rotating wave approximation,we derive the effective atomic Hamiltonians ... We study the ground state energy of an atom interacting with an oscillating optical field with electric dipole and quadrupole coupling.Under the rotating wave approximation,we derive the effective atomic Hamiltonians of the dipole/quadrupole coupling term within the perturbation theory up to the second order.Based on the effective Hamiltonians,we analyze the atomic ground-state energy corrections of these two processes in detail.As an application,we find that for alkali-like atoms,the energy correction from the quadrupole coupling is negligible small in comparison with that from the dipole coupling,which justifies the so-called dipole approximation used in literatures.Some special cases where the quadrupole interaction may have considerable energy corrections are also discussed.Our results would be beneficial for the study of atom–light interaction beyond dipole approximation. 展开更多
关键词 cold atom physics quantum optics atom-light interaction electric quadrupole
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Generation of a Super Strong Attosecond Pulse from an Atomic Superposition State Irradiated by a Shape-Optimized Short Pulse 认领 引用
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作者 郭福明 杨玉军 +2 位作者 金明星 丁大军 朱颀人 《Chinese Physics Letters》 SCIE EI CAS 2009年第11期56-59,共4页
Using a linearly polarized, phase-stabilized 3-fs driving pulse of 800 nm central wavelength shape-optimized on its＇ascending edge by its an amplitude-reduced pulse irradiating on a superposition state of the helium ... Using a linearly polarized, phase-stabilized 3-fs driving pulse of 800 nm central wavelength shape-optimized on its＇ascending edge by its an amplitude-reduced pulse irradiating on a superposition state of the helium atom, we demonstrate theoretically the generation of a super strong isolated 176-attosecond pulse in the spectral region of 93-124 eV. The unusually high intensity of this attosecond pulse is marked by the Rabi-like oscillations emerging in the time-dependent populations of the ground state and the continuum during the occurrence of the electron recombination, which is for the first time observed in this work. 展开更多
关键词 Atomic and molecular physics Optics quantum optics and lasers
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Ionization and Charge Transfer of Atomic Hydrogen by Highly Charged Ions 认领 引用
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作者 丁宝卫 胡碧涛 《Chinese Physics Letters》 SCIE EI CAS 2010年第4期95-98,共4页
Cross sections for charge transfer and ionization of atomic hydrogen by highly charged ions A^q＋ （q =6 9） are evaluated using a simple and classical method based on the previous works by Bohr and Lindhard [K. Dan. ... Cross sections for charge transfer and ionization of atomic hydrogen by highly charged ions A^q＋ （q =6 9） are evaluated using a simple and classical method based on the previous works by Bohr and Lindhard [K. Dan. Vidensk. Selsk. Mat. Fys. Medd 28 （1954） No 7], Brandt [Nucl. Instrum. Methods Phys. Res. 214 （1983） 93] and Ben-Itzhak et al. [J. Phys. B： At. Mol. Opt. Phys. 26 （1993） 1711]. It is proved that the present calculations are feasible to some extent in comparison with available experimental data and quantum calculations. 展开更多
关键词 Atomic and molecular physics
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X-ray transition and K-edge energies in dense finite-temperature plasmas:Challenges of a generalized approach with spectroscopic precision 认领 引用 被引量：1
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作者 X.Li F.B.Rosmej 《Matter and Radiation at Extremes》 SCIE EI CAS CSCD 2025年第2期1-15,共15页
The capacity to predict X-ray transition and K-edge energies in dense finite-temperatur plasmas with high precision is of primary importance for atomic physics of matter under extreme conditions.The dual characteristi... The capacity to predict X-ray transition and K-edge energies in dense finite-temperatur plasmas with high precision is of primary importance for atomic physics of matter under extreme conditions.The dual characteristics of bound and continuum states in dense matter are modeled by a valence-band-like structure in a generalized ion-sphere approach with states that are either bound,free,or mixed.The self-consistent combination of this model with the Dirac wave equations of multielectron bound states allows one to fully respect the Pauli principle and to take into account the exact nonlocal exchange terms.The generalized method allows very high precision without implication of calibration shifts and scaling parameters and therefore has predictive power.This leads to new insights in the analysis of various data.The simple ionization model representing the K-edge is generalized to excitation–ionization phenomena resulting in an advanced interpretation of ionization depression data in near-solid-density plasmas.The model predicts scaling relations along the isoelectronic sequences and the existence of bound M-states that are in excellent agreement with experimental data,whereas other methods have failed.The application to unexplained data from compound materials also gives good agreement without the need to invoke any additional assumptions in the generalized model,whereas other methods have lacked consistency. 展开更多
关键词 atomic physics matter dirac wave equations multielectron bound states spectroscopic precision x ray transitions k edge energies generalized approach valence band structure bound continuum states
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Enhancement of Continuous Variable Entanglement in Four-Wave Mixing due to Atomic Memory Effects 认领 引用 被引量：2
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作者 朱玉柱 胡响明 +1 位作者 王飞 李景艳 《Chinese Physics Letters》 SCIE EI CAS 2010年第4期143-146,共4页
We explore the effects of atomic memory on quantum correlations of two-mode light fields from four-wave mixing. A three-level atomic system in A configuration is considered, in which the atomic relaxation times are co... We explore the effects of atomic memory on quantum correlations of two-mode light fields from four-wave mixing. A three-level atomic system in A configuration is considered, in which the atomic relaxation times are comparable to or longer than the cavity relaxation times and thus there exists the atomic memory. The quantum correlation spectrum in the output is calculated without the adiabatic elimination of atomic variables. It is shown that the continuous variable entanglement is enhanced over a wide range of the normalized detuning in the intermediate and bad cavity cases compared with the good cavity case. In some situations more significant enhancement occurs at sidebands. 展开更多
关键词 Atomic and molecular physics Optics quantum optics and lasers
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Applications of Atomic and Molecular Theory to Calculations in Space Science and Engineering 认领 引用
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作者 Wang FuhengBeijing Institute of Environment Features,P.O.Box 142-207,Beijing 100854,China 《Journal of Systems Engineering and Electronics》 1991年第1期51-59,共9页
A systematic elaboration is given on atomic and molecular theory problems encountered in dealing with space science and engineering. Three sections are presented in the paper on calculations for gas thermodynamic and ... A systematic elaboration is given on atomic and molecular theory problems encountered in dealing with space science and engineering. Three sections are presented in the paper on calculations for gas thermodynamic and transfer properties, characteristics of the optical radiation from the reentry' bodies, and the interaction between surfaces of man-made satellites and incident particles. Researches on them are much related to the fundamental problems regarding the atomic and molecular theory. 展开更多
关键词 Atomic physics Molecular physics Astronautics.
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Collapse and Revival of an Atomic Beam Interacting with a Coherent State Light Field 认领 引用 被引量：1
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作者 李犇 陈景标 《Chinese Physics Letters》 SCIE EI CAS 2009年第12期87-90,共4页
We report on the phenomena of the periodic spontaneous collapse and revival in the dynamics of an atomic beam interacting with a single-mode and coherent-state light field. Conventional collapse and revival by Eberly ... We report on the phenomena of the periodic spontaneous collapse and revival in the dynamics of an atomic beam interacting with a single-mode and coherent-state light field. Conventional collapse and revival by Eberly et al. [Phys. Rev. Lett. 44（1980）1323 ] are presented in the case of the evolution with time of the population inversion. Here, we study the evolution with coupling strength of population inversion. We define the collapse and revival coupling strengths as characteristic parameters to describe the above collapse and revival. Furthermore, we present the analytic formulas for the population inversion, the collapse and revival coupling strengths. 展开更多
关键词 Atomic and molecular physics Optics quantum optics and lasers
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A Time-Dependent Wavepacket Method for Photodissociation Dynamics of Triatomic Molecule 认领 引用
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作者 Mohammad Noh Daud Gabriel G. Balint-Kurti 《Chinese Physics Letters》 SCIE EI CAS 2009年第7期111-114,共4页
We report a time-dependent quantum wavepacket theory employed to interpret the photoabsorption spectrum of the N20 molecule in terms of the nuclear motion on the upper 21A＇ and 11A＂ potential energy surfaces. The N2... We report a time-dependent quantum wavepacket theory employed to interpret the photoabsorption spectrum of the N20 molecule in terms of the nuclear motion on the upper 21A＇ and 11A＂ potential energy surfaces. The N2-O bond breaks upon excitation leading to dissociation. The total angular momentum is treated correctly taking into account the vector property of the electric field of the exciting radiation. 展开更多
关键词 Atomic and molecular physics
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Progress of the 87Rb Fountain Clock 认领 引用 被引量：6
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作者 ZHOU Zi-Chao WEI Rong +3 位作者 SHI Chun-Yan LV De-Sheng LI Tang WANG Yu-Zhu 《Chinese Physics Letters》 SCIE EI CAS 2009年第12期80-83,共4页
A fountain atomic clock based on cold 87Rb atoms has been in operation in our laboratory for several months.We therefore report the design of the rubidium fountain clock including its physical package,optical system a... A fountain atomic clock based on cold 87Rb atoms has been in operation in our laboratory for several months.We therefore report the design of the rubidium fountain clock including its physical package,optical system and daily operation.Ramsey fringes have been attained with the signal to noise ratio of about 100. 展开更多
关键词 Atomic and molecular physics Optics quantum optics and lasers
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Coherent Population Trapping-Ramsey Interference in Cold Atoms 认领 引用 被引量：4
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作者 陈曦 杨国卿 +1 位作者 王谨 詹明生 《Chinese Physics Letters》 SCIE EI CAS 2010年第11期51-54,共4页
We demonstrate an experimental observation of coherent population trapping-Ramsey interference in cold 87Rb atoms by employing the time-domain separated oscillatory fields＇ method. The interference fringe with line w... We demonstrate an experimental observation of coherent population trapping-Ramsey interference in cold 87Rb atoms by employing the time-domain separated oscillatory fields＇ method. The interference fringe with line width of 80 Hz is obtained. We propose a novel method to measure the cold atom number. The measurement is insensitive to the pump beam intensity, the single photon detuning and even the initial state population. We use this method to normalize the interference signal and to improve the signal-to-noise ratio significantly. 展开更多
关键词 Atomic and molecular physics Optics quantum optics and lasers
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Dressed Four-Wave Mixing Spectroscopy Modified by Polarization Interference and Atom-Wall Collision in Micrometric Thin Cells 认领 引用 被引量：3
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作者 李院院 李莉 +3 位作者 白晋涛 李昌彪 张彦鹏 侯洵 《Chinese Physics Letters》 SCIE EI CAS 2010年第4期118-121,共4页
Dressed four-wave mixing （DFWM） spectroscopy is investigated theoretically in some micrometric thin cells. It is found that DFWM spectra can be modified by polarization interference of atoms and transient effects in... Dressed four-wave mixing （DFWM） spectroscopy is investigated theoretically in some micrometric thin cells. It is found that DFWM spectra can be modified by polarization interference of atoms and transient effects induced by atom-wall collision. This modification can lead to width-narrowing of DFWM lines and facilitates to implement experiment of high resolution DFWM spectroscopy in a confined atomic system. 展开更多
关键词 Atomic and molecular physics Optics quantum optics and lasers
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Destructive and Constructive Interference of High-Order Harmonic Generation in Mixture of He and Ne Gases 认领 引用 被引量：4
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作者 金成 周效信 赵松峰 《Chinese Physics Letters》 SCIE EI CAS 2010年第3期120-123,共4页
Using the single-atom induced dipole moment under strong field approximation as a source, we suggest a model to simulate the macroscopic high-order harmonic generation （HHG） from the mixed gases （He and Ne） intera... Using the single-atom induced dipole moment under strong field approximation as a source, we suggest a model to simulate the macroscopic high-order harmonic generation （HHG） from the mixed gases （He and Ne） interacting with intense infrared laser by solving the three-dimensional Maxwell＇s equation of the harmonic field. Regular destructive interference （DI） and constructive interference （CI） are observed in the macroscopic HHG spectra when the gas jet is put at a good phase-matching position. A semiclassical model of short and long electron trajectories is applied to interpret the DI and CI of HHG qualitatively. 展开更多
关键词 Atomic and molecular physics Optics quantum optics and lasers
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An Experimental Observation of Axial Variation of Average Size of Methane Clusters in a Gas Jet 认领 引用 被引量：3
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作者 韩纪锋 杨朝文 +4 位作者 缪竟威 陆建峰 刘猛 罗小兵 师勉恭 《Chinese Physics Letters》 SCIE EI CAS 2010年第4期103-106,共4页
Axial variation of average size of methane clusters in a gas jet produced by supersonic expansion of methane through a cylindrical nozzle of 0.8 mm in diameter is observed using a Rayleigh scattering method. The scatt... Axial variation of average size of methane clusters in a gas jet produced by supersonic expansion of methane through a cylindrical nozzle of 0.8 mm in diameter is observed using a Rayleigh scattering method. The scattered light intensity exhibits a power scaling on the backing pressure ranging from 16 to 50bar, and the power is strongly Z dependent varying from 8.4 （Z = 3mm） to 5.4 （Z = 11mm）, which is much larger than that of the argon cluster. The scattered light intensity versus axial position shows that the position of 5mm has the maximum signal intensity. The estimation of the average cluster size on axial position Z indicates that the cluster growth process goes forward until the maximum average cluster size is reached at Z - 9 mm, and the average cluster size will decrease gradually for Z 〉 9 mm. 展开更多
关键词 Atomic and molecular physics
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Polarization Gradient Cooling by Zeeman-Effect-Assisted Saturated Absorption 认领 引用 被引量：3
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作者 韩顺利 程冰 +3 位作者 张敬芳 徐云飞 王兆英 林强 《Chinese Physics Letters》 SCIE EI CAS 2009年第12期99-102,共4页
A novel and simple method to realize polarization gradient cooling （PGC） is reported. The stabilizing, shifting and rapid tuning of the frequency of the external cavity diode laser is realized by using the Zeeman-ef... A novel and simple method to realize polarization gradient cooling （PGC） is reported. The stabilizing, shifting and rapid tuning of the frequency of the external cavity diode laser is realized by using the Zeeman-effect-assisted Doppler-free saturated absorption technique. Based on this convenient technique, 87Rb cold atoms are captured from room-temperature background vapor in the magneto-optical trap （MOT）. Meanwhile, the steady-state number, the density and the lifetime of atoms in the MOT are measured. Subsequently, a frequency-fast-varying circuit is designed to realize PGC, which is demonstrated effectively and reliably in experiments. The temperature of the cold atom cloud is measured by two different methods, which coincide with each other. 展开更多
关键词 Atomic and molecular physics
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Theoretical Investigation of Femtosecond-Resolved Photoelectron Spectra of the Li2 Molecule 认领 引用 被引量：5
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作者 刘玉芳 刘瑞琼 丁俊霞 《Chinese Physics Letters》 SCIE EI CAS 2009年第7期107-110,共4页
The time-dependent quantum wave packet method is used to investigate the dynamics for the Li2 molecule, and the time-resolved photoelectron spectra （TRPES） of the Li2 molecule are calculated. At the short delay time... The time-dependent quantum wave packet method is used to investigate the dynamics for the Li2 molecule, and the time-resolved photoelectron spectra （TRPES） of the Li2 molecule are calculated. At the short delay time, the particular phenomenon of TRPES with four peaks is qualitatively interpreted in a dressed state picture by analyzing wave packet motion on light-induced potential （LIP）. The significant difference in the electronic structure of E1∑g^＋ between the inner and outer turning points has an impact on the TRPES. The control for the first excited state A1∑u^＋ of the initial wave packet is discussed. 展开更多
关键词 Atomic and molecular physics Instrumentation and measurement
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Differential Cross Section and Polarization of Radiative Recombination 认领 引用 被引量：2
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作者 吴泽清 李月明 +2 位作者 段斌 张弘 颜君 《Chinese Physics Letters》 SCIE EI CAS 2009年第12期84-86,共3页
The formulae of photon angular distribution and polarization degree for radiative recombination are presented to include the contribution of multipoles and their correlations. A fully relativistic code is then develop... The formulae of photon angular distribution and polarization degree for radiative recombination are presented to include the contribution of multipoles and their correlations. A fully relativistic code is then developed to calculate the photon angular distribution and polarization. The calculated polarization degree and differential cross-sections agree well with that of Scofild＇s results within 10%. The effects of multipoles on polarization and angular distribution are investigated. The polarization and the angular distribution become asymmetric when the multipoles are accounted as the electron energy increases. 展开更多
关键词 Atomic and molecular physics
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Adiabatic Fidelity of Coherent Atom-Heteronuclear Molecule Conversion 认领 引用 被引量：1
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作者 耿振铎 贾宁 +2 位作者 赵旭 夏田雨 景辉 《Chinese Physics Letters》 SCIE EI CAS 2010年第3期21-24,共4页
We study the adiabatic dark-state evolutions in coherent creations of heteronuclear diatomic or triatomic molecules from an ultracold two-species atomic condensate. We find that, for different nonlinear systems, the r... We study the adiabatic dark-state evolutions in coherent creations of heteronuclear diatomic or triatomic molecules from an ultracold two-species atomic condensate. We find that, for different nonlinear systems, the relations between the adiabatic fidelities and the adiabatic parameters are in a universal power law but with quite different parameters. 展开更多
关键词 Atomic and molecular physics Optics quantum optics and lasers
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Implementing a Multi-Qubit Quantum Phase Gate Encoded by Photonic Qubit 认领 引用 被引量：2
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作者 陆培民 宋杰 夏岩 《Chinese Physics Letters》 SCIE EI CAS 2010年第3期17-20,共4页
A protocol is proposed to implement a three-qubit phase gate for photonic qubits in a three-mode cavity. The idea can be extended to directly implement a N-qubit phase gate. We also show that the interaction time rema... A protocol is proposed to implement a three-qubit phase gate for photonic qubits in a three-mode cavity. The idea can be extended to directly implement a N-qubit phase gate. We also show that the interaction time remains unchanged with the increasing number of qubits. In addition, the influence of cavity decay and atomic spontaneous emission on the gate fidelity and photon loss probability is also discussed by numerical calculation. 展开更多
关键词 Atomic and molecular physics Computational physics Optics quantum optics and lasers Quantum information and quantum mechanics
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