共查询到18条相似文献,搜索用时 124 毫秒
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非旋波近似下双光子Jaynes-Cummings模型中光子反聚束效应的研究 总被引:5,自引:0,他引:5
利用弱场-弱耦合-短时近似,研究了旋波近似与非旋波近似下双光子Jaynes-Cummings模型(JCM)中光子的反聚束效应,分析了虚光子过程对此效应的影响。 相似文献
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研究Kerr介质中,非旋波近似下,一个级联型三能级原子与光场相互作用的二阶相干度的时间演化,讨论了Kerr效应和虚光场效应对场的光子反聚束效应的影响.结果表明,虚光场的影响使系统出现量子噪声;而Kerr介质常量x、共振频率ω的增大及原子-场耦合系数g的减小都将降低原子对激发场的吸收效率,削弱受激辐射场的光子反聚束效应,其中以g的变化对系统的影响最为明显.
关键词:
非旋波近似
Kerr效应
反聚束 相似文献
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一个二能级原子在经典场的驱动下与单模光场相互作用,在强经典驱动和大失谐的情况下,原子与光场的相互作用可以化为有效的反Jaynes-Cummings模型.在该模型下主要研究了双模纠缠相干光场中的一束与受强经典场驱动的二能级原子相互作用,在演化过程中,对原子作选择性测量,即通过操纵参加相互作用光场的作用时间以及选择适当的光场参数,可以在较长的时间范围和较大的相干参数范围内很好地控制未参加相互作用的相干光场的量子统计特性,得到预期的非经典光场.
关键词:
量子光学
反Jaynes-Cummings模型
反聚束效应
压缩效应 相似文献
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Stark效应对双光子Jaynes-Cummings模型中原子的压缩效应的影响 总被引:1,自引:0,他引:1
本文研究了包括Stark效应时任意初态的双光子Jaynes-CUmmings模型的一般演化规律,应用到具体问题,讨论了初始时刻有效二能级原子处于基态而光场为二项式分布时原子的压缩效应。 相似文献
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本文利用友格-库塔法对多个方程组连续进行积分,提出了一种处理依赖于时间的Janes-Cummings模型,描述二能级原子与腔场相互作用的耦合系数依赖于时间的JCM的哈密顿量为H=1/2ω0σ3+ω^+a^+a^+g(t)(σ+a+σ-a)h=1(1)这里,g(t)选择为时间上的一个脉冲g(t)=g0exp(-(t-t0)^2/2a^2),其中t0和a分别为脉冲中心和脉冲宽度,g0是一有量纲常数, 相似文献
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不同激光脉冲对J-C模型中的反聚束效应的影响 总被引:1,自引:2,他引:1
选取三种不同的激光脉冲形式,研究了依赖于时间的J-C模型中的反聚束效应.并对三种不同脉冲形式下所得的结果进行比较. 相似文献
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Sub-poissonian photon statistics and antibunching by the definition based on the positive derivative of g(2) (t, t+τ) as a function of the delay time τ at τ=0 are treated in a single-mode single-two-level-atom model. It is shown, in particular, that sub-poissonian behaviour may be accompanied by bunching or antibunching and photon-antibunching may be accompanied by sub-poissonian or super-poissonian field statistics. It is also shown that the photon-antibunching persists with increasing mean photon number of an initial chaotic state while the sub-Poisson behaviour disappears. 相似文献
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Maciej Janowicz 《Reports on Mathematical Physics》2004,54(1):71-79
The three-level atomic system interacting with one mode of the electromagnetic field in a Ξ-configuration is investigated. Effective Hamiltonians for two-photon processes without the rotating wave approximation are obtained by application of the perturbation method of multiple time scales. Some inaccuracies in the form of Hamiltonians of this type recently presented are pointed out and corrected. 相似文献
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初始处于纠缠的原子与附加类克尔介质的光腔相互作用,运用共生纠缠的度量方法对原子间的纠缠演化动力学进行研究,分析了腔场粒子数、介质非线性效应及原子与腔场的失谐量对纠缠演化的影响,发现处于腔场真空态下原子间的纠缠作周期性震荡演化,而处在腔场粒子数态下的原子在演化过程中发生纠缠突然死亡现象;在非线性克尔介质作用下,处于腔场粒子数较小范围内(n≤5)的原子间也会产生纠缠突然死亡现象;但随着腔场粒子数的增加纠缠突然死亡现象消失而且一定程度上可以达到纠缠初始值;当腔场处于任意粒子数态时,由于非线性效应的影响,均可抑制纠缠突然死亡现象的发生;当腔场在没有类克尔介质作用时,原子与腔场间的失谐量同样可以避免纠缠突然死亡现象的发生. 相似文献
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The effects of Kerr-like medium and intensity-depend coupling on entropy exchange and entanglement in Jaynes-Cummings model are investigated. Our results show that introducing the Kerr-like medium and intensity-depend is very helpful for improving the quality of entropy exchange. In addition, by the concept of the lower bound of the concurrence, the entanglement between the atom and the field under the influences of Kerr-like medium and intensity-depend coupling is also presented. 相似文献
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Population Dynamics and Emission Spectrum of a Cascade Three-Level Jaynes-Cummings Model with Intensity-Dependent Coupling in a Kerr-like Medium 总被引:1,自引:0,他引:1
ZHOU Qing-Chun 《理论物理通讯》2006,45(4):727-730
By using the method of eigenvectors, the atomic populations and emission spectrum are investigated in a system that consists of a cascade three-level atom resonantly interacting with a single-mode field in a Kerr-like medium.The atom and the field are assumed to be initially in the upper atomic state and the Fock state, respectively. Results for models with intensity-dependent coupling and with intensity-independent coupling are compared. It is found that both population dynamics and emission spectrum show no indications of atom-field decoupling in the strong field limit if the intensity-dependent coupling is taken into account. 相似文献
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If a two-level atom is in the two-photon resonance with a quantized mode and simultaneously inter-acts with a quasi-resonance classical field, then a photon exchange is observed in this system between the quantized and classical modes. It is demonstrated that such a physical system can serve as a source of squeezed radiation in the quantized mode. The squeezing can be arbitrarily close to unity, while the radiation amplitude can be relatively large. A situation is discussed when N atoms are in the two-photon resonance with a quantized mode and simultaneously interact with a classical field. The phenomenon of exponential superradiation is described when the number of photons in the quantized mode exponentially depends on the number N of atoms. 相似文献
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利用多光子J-C模型,考虑场频率随时间以正弦函数形式作小量变化,在旋波近似下,研究了二能级原子通过多光子跃迁与单模辐射场相互作用系统中场的反聚束效应.利用数值计算方法给出反映场反聚束效应的二阶关联函数随时间的演化曲线.研究结果表明:场二阶关联函数的演化受场频率随时间正弦函数形式变化的调制,场频率振荡的幅值 u越大调制作用越强,在场频率振荡的幅值u大于一定值后,场二阶关联函数随时间的演化呈现出周期性振荡特性,其振荡周期与场频率变化的周期一致. 相似文献