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Trace initial interaction from final state observable in relativistic heavy ion collisions

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Chinese Physics C 2009年第1期33卷 36-41页

作者：王美娟刘连寿吴元芳 Institute of Particle Physics Huazhong Normal University

In order to trace azimuthal angle dependence of the initial interaction in ultra-relativistic heavy ion collision, two azimuthal multiplicity-correlation patterns neighboring and fixed-to-arbitrary angularbin correlation patterns -- are suggested. From the simulation of Au ＋ Au collisions at √SNN = 200 GeV by using the Monte Carlo models RQMD with hadron re-scattering and AMPT with and without string melting, we observe that the correlation patterns change gradually from out-of-plane preferential one to inplane preferential one when the centrality of collision shifts from the central collision to peripheral collision, meanwhile the anisotropic collective flow v2 keeps positive in all cases. This regularity is found to be collision energy independent. The physics behind the two opposite trends of correlation patterns, in particular, the presence of out-of-plane correlation patterns at RHIC energy, are discussed.

关键词： angular-bin correlation patterns centrality in-plane out-of-plane

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Phase Control of Spontaneous Emission of a Three-Level Atom in Two Bichromatic Fields

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Chinese Physics Letters 2006年第2期23卷 340-343页

作者：李晓霞胡响明石文星徐清郭洪菊李景艳 Department of Physics Huazhong Normal University Wuhan 130079

We use the relative phase difference of two bichromatic fields of equal frequency differences for the coherent control of spontaneous emission of a three-level atom in the A configuration, diffects such as selective and total cancellation of fluorescence decay are obtained simply by varying the phase difference. The phese dependence of fluorescence spectra is attributed to the fact that the four different field components induce the transitions in a closed loop configuratiou.

关键词： ELECTROMAGNETICALLY INDUCED TRANSPARENCY RESONANCE-FLUORESCENCE ABSORPTION-SPECTRA RAMAN-SCATTERING 2-LEVEL ATOMS SYSTEM SPECTROSCOPY EXCITATION QUANTUM DRIVEN

THE EXISTENCE OF NONTRIVIAL SOLUTIONS TO A SEMILINEAR ELLIPTIC SYSTEM ON R N WITHOUT THE AMBROSETTI-RABINOWITZ CONDITION

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Acta Mathematica Scientia 2010年第6期30卷 1917-1936页

作者：李工宝王春花 School of Mathematics and Statistics Huazhong Normal University

In this paper, we prove the existence of at least one positive solution pair （u, v）∈ H1（RN） × H1（RN） to the following semilinear elliptic system {-△u＋u=f（x,v）,x∈RN,-△u＋u=g（x,v）,x∈RN （0.1）,by using a linking theorem and the concentration-compactness principle. The main conditions we imposed on the nonnegative functions f, g ∈C0（RN× R1） are that, f（x, t） and g（x, t） are superlinear at t = 0 as well as at t =＋∞, that f and g are subcritical in t and satisfy a kind of monotonic conditions. We mention that we do not assume that f or g satisfies the Ambrosetti-Rabinowitz condition as usual. Our main result can be viewed as an extension to a recent result of Miyagaki and Souto [J. Diff. Equ. 245（2008）, 3628-3638] concerning the existence of a positive solution to the semilinear elliptic boundary value problem {-△u＋u=f（x,u）,x∈Ω,u∈H0^1（Ω） where Ω ∩→RN is bounded and a result of Li and Yang [G. Li and J. Yang： Communications in P.D.E. Vol. 29（2004） Nos.5＆ ***.925-954, 2004] concerning （0.1） when f and g are asymptotically linear.

关键词： existence nontrivial solution semilinear elliptic system without the (AR) condition

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Absorption Spectrum of a Driven Two-Level Atom in a Tunable Cavity with Injected Squeezed Vacuum

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Chinese Physics Letters 2000年第7期17卷 501-503页

作者： LI Gao-Xiang HUANG Guang-ming PENG Jin-sheng Department of Physics Huazhong Normal UniversityWuhan 430079

The absorption spectrum of a driven two-level atom in a frequency tunable cavity with injected squeezed vacuum is investigated. The line shape of the spectra depends on the relative phase between the driving field and the squeezed vacuum, and the frequency detuning between the driving field and the cavity mode. Line narrowing and probe gain can occur and be enhanced by adjusting the phase and detuning.

关键词： vacuum phase absorption

Distributions and correlations of constituent quarks in jets

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Chinese Physics C 2011年第6期35卷 561-566页

作者：黄瑞典蔡勖钱婉燕杨纯斌 Institute of Particle Physics Huazhong Normal University

In the frame of the quark recombination model, we study the momentum distributions and correlations of constituent quarks in jets by analyzing the final state hadrons generated by PYTHIA for the hard parton fragmentat... 详细信息

关键词： quark recombination constituent quark distribution function jet fragmentation PYTHIA

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Entangled Radiation through an Atomic Reservoir Controlled by Coherent Population Trapping

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Chinese Physics Letters 2008年第9期25卷 3234-3237页

作者：李茜钟文学胡响明 Department of Physics Huazhong Normal University Wuhan 430079

We show that it is possible to generate Einstein-Podolsky-Rosen （EPR） entangled radiation using an atomic reservoir controlled by coherent population trapping. A beam of three-level atoms is initially prepared in nearcoherent population trapping （CPT） state and acts as a long-lived coherence-controlled reservoir. Four-wave mixing leads to amplification of cavity modes resonant with RabJ sidebands of the atomic dipole transitions. The cavity modes evolve Jnto an EPR state, whose degree of entanglement is controlled by the intensities and the frequencies of the driving fields. This scheme uses the long-lived CPT coherence and is robust against spontaneous emission of the atomic beam. At the same time, this scheme is implemented in a one-step procedure, not in a two-step procedure as was required in Phys. Rev. Lett. 98 （2007） 240401.

关键词： the power-law exponents precipitation durative abrupt precipitation change

Scalable Generation of Cluster State for Multiple Hot Trapped Ions

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Chinese Physics Letters 2008年第4期25卷 1198-1201页

作者：程广玲胡响明 Department of Physics Huazhong Normal University Wuhan 430079

We propose an alternative scheme for preparing N-qubit cluster state by using a frequency-modulated laser field to simultaneously illuminate the trapped ions. Selecting the index of modulation yields the selective mechanisms of coupling and decoupling between the internal and external states of the ions. Based on the selective mechanisms, the highly entangled cluster state is achieved. In our scheme, the vibration mode is only virtually excited. Thus the quantum operations are insensitive to the heating and lead to the high-fidelity quantum information processing.

关键词： THERMAL MOTION MULTIPARTICLE ENTANGLEMENT BELL THEOREM QUANTUM PARTICLES GATE

Enhancement of Continuous Variable Entanglement in Four-Wave Mixing due to Atomic Memory Effects

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Chinese Physics Letters 2010年第4期27卷 143-146页

作者：朱玉柱胡响明王飞李景艳 Department of Physics Huazhong Normal University Wuhan 430079

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.

关键词： Atomic and molecular physics Optics quantum optics and lasers

Effects of Detunings on Dynamically Induced Irreversibility in Coherently Driven Systems

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Chinese Physics Letters 2000年第3期17卷 200-202页

作者： HU Xiang-Ming PENG Jin-Sheng Department of Physics Huazhong Normal UniversityWuhan 430079

Effects of detunings on dynamically induced irreversibility is studied for coherently driven V systems in which there is no conventional source of irreversible population *** atomic barium(γ1/γ2=400>>1,whereγ1 andγ2 are the rates of the spontaneous decay from the excited states 6s6p^(1)P_(1)and 6s6p^(3)P_(1)to the ground state 6s^(2)^(1)S_(0),respectively),the strong irreversibility is found to lead to a maximum inversion of 0.77[only 0.1 in ***.71(1993)4311].The maximum population inversion requires relatively strong Gelds coupled respectively to two transitions,a disparity in two atomic decay rates,and the atom-field detunings of opposite ***,it is also shown that even in the cases where two detunings have the same sign,or where two decay rates are equal,population inversion takes place.

关键词： decay irreversible excited