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Four-Wave　Mixing　Scheme　in　a　Four-Level　Ladder-Type　Atomic　System　Based　on　Electromagnetically　Induced　Transparency

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Chinese Physics Letters 2004年第6期21卷 1075-1078页

作者： lijia-hua CHENAi-Xi PENGJu-Cun DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074 CentreforColdAtomPhysics WuhanInstituteofPhysicsandMathematicsChineseAcademyofSciencesWuhan430071 DepartmentofPhysics XiaoganNormalUniversityXiaogan432100

A nonlinear optical four-wave mixing scheme is presented and analysed for the generation of coherent light in a nearly four-level ladder-type atomic system in the context of electromagnetically induced transparency (EIT). We find that EIT can suppress nonlinear photon absorption and the peak of the generated mixing field is located at the centre of the transparency window where the loss is minimal, though there is a dip in the centre. Such a nonlinear optical process can also be used for generating coherent short-wavelength radiation.

关键词： Four wave mixing

Electromagnetically Induced Transparency in a Four-Level Atomic System

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Communications in Theoretical Physics 2004年第1X期42卷 113-116页

作者： lijia-hua WANGWen-Yi DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074China NationalKeyLaboratoryforLaserTechnique HuazhongUniversityofScienceandTechnologyWuhan430074China

In this paper, we analyze and discuss the absorption properties of the probe beam in a four-level atomic system with a nearly hyper-fine doublet structure of two higher-lying excited levels based on electromagnetically induced transparency (EIT) for the two cases of transient process and steady-state process. The main gain of this work is to investigate theoretically the influence of the nearly hyper-fine levels on the probe absorption. For the transient process,using the numerical calculations by a simple Mathematica code we find that the magnitude of the probe absorption at the line center is small compared to the typical three-level atomic system in the context of electromagnetically induced transparency. For the case of the steady state, our results show that the probe absorption can be completely eliminated at the line center of the probe transition just as the usual three-level EIT scheme.

关键词：稳定态电磁诱导透彻性四层原子体系原子物理学量子干涉量子相关

Absorption-Amplification Response with or Without Spontaneously Generated Coherence in a Coherent Four-Level Atomic Medium

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Communications in Theoretical Physics 2004年第3X期42卷 425-430页

作者： lijia-hua YANGWen-Xing PENGJu-Cun DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074China InstituteofPhysicsandMathematics theChineseAcademyofSciencesWuhan430071China DepartmentofPhysics XiaoganNormalUniversityXiaogan432100China

We discuss and analyze the absorption-amplification properties of a weak probe field in a typical four-level atomic system in the presence of an additional coherence term, the spontaneously generated coherence term. Theinfluences of the spontaneously generated coherence and a coherent pump field on the probe absorption (amplification)are investigated in detail. We show that the absorption of such a weak probe field can be dramatically enhanced dueto the presence of the spontaneously generated coherence. At the same time, the probe-absorption profile exhibitsthe double-peak structure and the probe-absorption peak gradually decreases as the pump intensity increases. On thecontrary, the amplification of such a weak probe field near the line center of the probe transition can be achieved byadjusting the coherent pump field intensity in the absence of the spontaneously generated coherence.

关键词：探针吸收作用量子相干量子干涉量子光学吸收-放大响应

Analytical Method for Energy Spectra and Eigenstates in the Process of κ-Photon Down-Conversion with Quantized Pump

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Communications in Theoretical Physics 2003年第3X期40卷 293-298页

作者： lijia-hua CHENAi-Xi WANGWen-Yi DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074China WuhanInstituteofPhysicsandMathematics theChineseAcademyofSciencesWuhan430071China NationalKeyLaboratoryforLaserTechnique HuazhongUniversityofScienceandTechnologyWuhan430074China

In this paper, using the arguments of Wu et al. [Phys. Rev. Left. 86 (2001) 2200] we analytically discuss the energy spectra and corresponding eigenstates for the process of κ-photon down-conversion with quantized pump in a high-Q cavity by the aid of the computer programme. Remarkably, it is also shown that such a method can be used for solving numerically the equations in a much simpler manner than the previous ones.

关键词：量子光学分析方法能谱分析能量本征态 κ光子下转换非线性过程

Trace Distance of Remote State Preparation Through Noisy Channels

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Communications in Theoretical Physics 2005年第4期43卷 631-636页

作者： CHENAi-Xi lijia-hua JINLi-Xia WuhanInstituteofPhysicsandMathematics theChineseAcademyofSciencesWuhan430071China DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074China

In this paper, we study remote state preparation (RSP) by w state through noisy channels. The trace distance is used to describe how close the original state is to the output state. Studies show the trace distance is a function of decohenrence rates and angles of the state to be prepared. At the same time, we investigate the influence of different types of noises on the trace distance and find the various types of noises have different degrees of influence on the trace distance for a definite qubit. We also study changes of the trace distance against polar and azimuthal angles.

关键词： remote state preparation trace distance w states

Scheme for Preparation of W State Among Three Cavity Modes

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Communications in Theoretical Physics 2005年第6期43卷 1030-1032页

作者： ZHANZhi-Ming lijia-hua YANGWen-Xing StateKeyLaboratoryofLaserTechnology HuazhongUniversityofScienceandTechnologyWuhan430074China DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074China CenterforColdAtomPhysics theChineseAcademyofSciencesWuhan430071China

We present a scheme of preparing the tripartite W state among three cavitymodes of radiation field inside high-Q superconducting cavities. Our scheme is based on theinteraction of a four-level atom with the cavity Gel... 详细信息

关键词： W state cavity dipole

Multi-component Entangled State Generation for Three-Level Atomic System with Hyperfine Structure via Dispersive Interactions

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Communications in Theoretical Physics 2004年第4X期42卷 517-520页

作者： YANGWen-Xing lijia-hua JINLi-Xia WuhanInstituteofPhysicsandMathematics TheChineseAcademyofSciencesWuhan430071China DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074China

We discuss the generation of certain kinds of multi-component entangled states for three-level atomic system with hyperfine structure. The method proposed here is based on the interactions of dispersive cavity with only one atom driven by a strong classical field. It is shown that, with a judicious choice of the cavity detuning and applied coherent field detuning, the atom can interact dispersively with the quantized field but the classical driving field gives rise to the creation or destruction of photons conditional on the state of the system. In comparison with previous schemes,our method is likely to be extremely easy to realize in

关键词：三层原子系统多组分纠缠态超精细结构原子物理学色散相互作用

Optical Multi-wave Mixing Process Based on Electromagnetically InducedTransparency

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Communications in Theoretical Physics 2004年第1期41卷 106-110页

作者： lijia-hua PENGJu-Cun CHENAi-Xi DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074China DepartmentofPhysics XiaoganNormalUniversityXiaogan432100China DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074ChinaWuhanInstituteofPhysicsandMathematicstheChineseAcademyofSciencesWuhan430071China

In this paper, we propose and analyze an optical multi-wave mixing scheme for the generation of coherent light in a five-level atomic system in the context of electromagnetically induced transparency. A detailed semiclassical study of the propagation of generated mixing and probe fields is demonstrated. The analytical dependence of the generated mixing field on the probe field and the respective detuning is predicted. Such a nonlinear optical process can be used for generating short-wavelength radiation at low pump intensities.

关键词： optical multi-wave mixing electromagnetically induced transparency Rabi frequency

Absorption-Dispersion Properties in a Four-Level Atomic System with Vacuum-Induced Coherence

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Communications in Theoretical Physics 2005年第1X期44卷 146-150页

作者： WEIhua lijia-hua ZHANZhi-Ming PENGJu-Cun DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074China StateKeyLaboratoryofLaserTechnology HuazhongUniversityofScienceandTechnologyWuhan430074China DepartmentofPhysics XiaoganNormalUniversityXiaogan432100China

We discuss and analyze absorption-dispersion response for the probe field in a typical four-level atomic system with vacuum-induced coherence (VIC) arising from the cross coupling pathways associated with a pair of upper excited hyperfine levels. We find that VIC effect can preserve electromagnetically induced transparency (EIT) by using the detailed numerical simulations based on the density-matrix equations and analytical calculations in the dressed-state picture. We also show that the atomic hyperfine structure cannot be a hindrance to obtaining EIT.

关键词：真空感应器一致性探测器吸收散射频率散射