Spectrum of the Micromaser with Kerr Medium

We have established the master equation for the micromaser with Kerr medium field density operator, studied the spectrum of the micromaser with Kerr medium and analyzed the influence of Kerr effect and the detuning on the spectrum. In the thermal-atom regime, we find that Kerr effect broadens linewidth D and increases frequency-shift S, and that the detuning Δ narrows linewidth D and increases frequency-shift S as a whole. Moreover Kerr effect leads to oscillatings more rapidly in the resonance peaks, which means that it causes quantum noise. As a whole, with the increase of cavity-length L, the linewidth D and frequency-shift S gradually increase.

Fidelity of quantum information for V-type three-level atom interacting with a number state light field in Kerr medium

In this paper the evolution characteristics of the fidelity of quantum information for the V-type three-level atom interacting with number state light field in Kerr meddium are investigated. It shows that the periodicity of the evolutions of fidelity of quantum information is influenced by the Kerr coefficient, the photon number of the initial field and intensity of light. The evolutions of the fidelity of quantum information are modulated by the initial number state field. The Rabi oscillation frequency and the modulation frequency of fidelity for the field and the system vary with the value of the Kerr coefficient. The evolutions of fidelity of quantum information obviously show the quantum collapse and revival behaviours in the system of atom interacting with light field.

Entanglement of two two-level atoms trapped in coupled cavities with a Kerr medium

In this paper, the entanglement dynamics of two two-level atoms trapped in coupled cavities with a Kerr medium is investigated, We find that the phenomena of entanglement sudden death （ESD） and entanglement sudden birth （ESB） appear during the evolution process. The influences of initial atomic states, Kerr medium, and cavity-cavity hopping rate on the atom-atom entanglement are discussed. The results obtained by the numerical method show that the atom- atom entanglement is strengthened and even prevented from ESD with increasing cavity-cavity hopping rate and Kerr nonlinearity.

Enhancing stationary optomechanical entanglement with the Kerr medium

We theoretically investigate the stationary entanglement of a optomechanical system with an additional Kerr medium in the cavity. There are two kinds of interactions in the system, photon-mirror interaction and photon-photon interaction. The optomechanical entanglement created by the former interaction can be effectively controlled by the latter one. We find that the optomechanical entanglement is suppressed by Kerr interaction due to photon blockage. We also find that the Kerr interaction can create the stationary entanglement and induce the resonance of entanglement in the small detuning regime. These results show that the Kerr interaction is an effective control for the optomechanical system.

Partial entropy change and entanglement in the mixed state for a Jaynes-Cummings model with Kerr medium

By using the algebraic dynamical approach, an atom--field bipartite system in mixed state is employed to investigate the partial entropy change and the entanglement in a cavity filled with Kerr medium. The effects of different nonlinear intensities are studied. One can find that the Kerr nonlinearity can reduce the fluctuation amplitudes of the partial entropy changes and the entanglement of the two subsystems, and also influence their periodic evolution. Meanwhile, increasing the Kerr nonlinear strength can convert the anti-correlated behaviour of the partial entropy change to the positively correlated behaviour. Furthermore, the entanglement greatly depends on the temperature. When the temperature or the nonlinear intensity increases to a certain value, the entanglement can be suppressed greatly.

Fluctuations and Squeezing for Measured Phase Operators of the J-C Model in the Kerr Medium

By using the theory of measured phase operator proposed by Barnett and Pegg, dynamic properties of the phase of a field are studied. The time evolution and squeezing of measured phase operators of a coherent field interacting with a two-level atom in the cavity with or without the Kerr medium are investigated. The influences of virtual cavity field on squeezing of measured phase operator are studied. Our numerical results show that the squeezing effects are clearly influenced by Kerr medium parameters, the field intensity, and the detuning. Moreover, the influence of the virtual-photon field makes more quantum noise in the evolution of measured phase operators. Key words Jaynes-Cummings model (JCM) - Kerr medium - measured phase operator - squeezing - virtual photon PACS 2001 4250Dv

Entanglement Dynamics of Atoms in Double Jaynes-Cummings Models with Kerr Medium

Entanglement dynamics of the atoms in the double Jaynes-Cummings models with the Kerr medium isstudied, and the effect of the Kerr medium on that is examined.The result shows that, the Kerr medium can control theentanglement dynamics of the atoms and repress entanglement sudden death.We can obtain the maximum entanglementbetween the atoms by strengthening the nonlinear interaction of the Kerr medium.

Phase Properties of Photon-Added Coherent States for Nonharmonic Oscillators in a Nonlinear Kerr Medium

The potential of nonharmonic systems has several applications in the field of quantum physics. The photonadded coherent states for annharmonic oscillators in a nonlinear Kerr medium can be used to describe some quantum systems. In this paper, the phase properties of these states including number-phase Wigner distribution function,Pegg-Barnett phase distribution function, number-phase squeezing and number-phase entropic uncertainty relations are investigated. It is found that these states can be considered as the nonclassical states.

Dynamic Behaviors of Coupled Three-Level Atom System Interactingwith Light Field in Cavity Filled with Kerr-Like Medium

The Hamiltonian of coupled three-level atoms interacting with light field in the cavity filled with Kerr-like medium is derived. A simplified analytic solution to the Schrodinger equation of the system is obtained. The case of A type atom with degenerate lower levels is discussed in detail. It is shown that the coupling strength between atoms and Kerr coefficient affect the system＇s dynamic behaviors, especially the modulation period and oscillation frequency of the squeezing parameters of the field and the collective dipole moment. Dynamic behaviors of the system are sensitive to the initial state of atoms.

Imaging Transparent Objects in a Turbid Medium Using a Femtosecond Optical Kerr Gate

A femtosecond optical Kerr gate time-gated ballistic imaging method is demonstrated to image a transparent object in a turbid medium. The shape features of the object are obtained by time-resolved selection of the ballistic photons with different optical path lengths, the thickness distribution of the object is mapped, and the maximum is less than 3.6%. This time-resolved ballistic imaging has potential applications in studying properties of the liquid core in the near field of the fuel spray.

Entanglement dynamics of a double two-photon Jaynes-Cummings model with Kerr-like medium

In this paper, the entanglement dynamics of a double two-photon Jaynes-Cummings model with Kerr-like medium is investigated. It is shown that initial entanglement has an interesting subsequent time evolution, including the so-called entanglement sudden death effect. It is also shown analytically that the Kerr-like medium can repress entanglement sudden death and enhance the degree of atom-atom entanglement. A more interesting fact is that the Kerr effect is more obvious when each of the two cavities with have the Kerr-like medium than only one of them with the Kerr-like medium.

一维非均匀Kerr介质的传输矩阵算法

研究了一维非均匀Kerr介质的子层逆向递推传输矩阵算法 ,给出了数值实现方案 此方法可以方便而精确地模拟非均匀Kerr介质的传输行为 应用此算法模拟一维Kerr缺陷光子晶体的光学双稳开关过程时 。

Kerr介质中耦合双原子与场相互作用的原子占居态几率的动力学性质

研究了类克尔介质中初始时刻分别处于激发态和基态的耦合双原子与场相互作用过程中，原子占居几率的量子动力学性质：讨论了Ｋｅｒ介质场耦合系数μ、原子间偶极偶极相互作用的耦合系数ｇａ及激发场强ｎ对它们的影响．结果表明：μ和ｇａ的增大，使原子与场的惯性作用减小，而ｎ的增强，则使原子的同步跃迁效应增强．

Kerr介质中压缩真空场与耦合双原子依赖强度耦合系统原子布居数的时间演化

研究了存在Kerr介质时 ,单模压缩真空场与耦合双原子依赖强度耦合相互作用系统原子布居数的时间演化规律 ,讨论了Kerr介质、原子间相互作用和光场的初始压缩因子对原子布居数时间演化的影响。

高Q Kerr介质腔中SU(2)相干态光场与Λ型三能级原子的相互作用

研究了一位于高 Q Kerr介质腔中的 SU(2 )相干态光场与 Λ型三能级原子相互作用系统中 ,Kerr效应对三能原子布居概率、光子统计分布、光场的模间相关性、Cauchy- Schwartz不等式以及光场差压缩的影响 .结果表明 ,较强的 Kerr效应可使原子 Rabi振荡呈现明显的崩溃与回复现象 ,而使场的非经典相关程度减弱 ,但适当强度的 Kerr效应可使光场差压缩程度明显增强 .

Kerr介质中级联三能级原子与压缩相干态相互作用的光子统计演化

本文研究了存在Kerr介质的高Q腔中压缩相干态与级联三能级原子相互作用的光子统计演化规律，讨论了光场参数、Kerr介质及相干振幅对平均光子数的影响．

Kerr介质中“耦合双原子-单模光场”模型的反聚束效应

利用全量子理论,研究了在Kerr介质中,耦合二能级双原子与单模光场相互作用过程的反聚束效应,着重讨论了Kerr介质对场的二阶相干度的影响,并揭示了初始场强及原子间耦合系数的变化与场的二阶相干度的关系。

Kerr介质中三能级原子与压缩光场相互作用的光子统计分布特性

本文研究了充满Ｋｅｒ介质的高Ｑ腔中压缩相干态与级联三能级原子相互作用的光子统计分布特性。

高QKerr腔中双模光场与V型原子作用光场的等幂次和压缩效应(英文)

利用多模压缩态理论 ,通过数值计算研究了高QKerr介质腔中非关联双模相干态光场与V型三能级原子相互作用系统中光场的等幂次和压缩效应 .结果表明 :1 )当Kerr介质的非线性系数x≠ 0时 ,相互作用系统中双模光场存在间断的等幂次和压缩效应 .在相同的介质环境和光强的情况下 ,最大压缩度发生在一次等幂次和压缩度的第一正交分量和二次等幂次和压缩度的第二正交相位分量上 .2 )不论介质和光场强度如何变化 ,在不考虑坐标轴标度的情况下 ,任意幂次的等幂次和压缩度的时间演化曲线的形状非常相似 .都显示”崩坍 复原 凹谷”式结构 ,且复原区的波型振荡次数及凹谷区的振荡下降和振荡上升型式一样 .3)演化曲线的周期强烈地依赖于Kerr介质的非线性系数 ,且反比于该系数 .演化曲线的幅度强烈地依赖于光场强度 ,并随着场强的增加而增大 .4)等幂次和压缩度的大小随压缩次数的升高而迅速下降 (N >2 ) ,但却随着平均光子数的增加而增大 .

高Q Kerr介质腔内强相干光场与A型三能级原子相互作用中原子的偶极压缩效应

研究了处于高Q Kerr介质腔中强相干光场与A型三能级原子相互作用中原子的偶极压缩。着重讨论了Kerr介质、原子与光场间的耦合系数以及失谐量对原子偶极压缩的影响。