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1.
Entropy squeezing and atomic inversion in the K-photon Jaynes–Cummings model in the presence of the Stark shift and a Kerr medium:A full nonlinear approach 下载免费PDF全文
The interaction between a two-level atom and a single-mode field in the k-photon Jaynes–Cummings model(JCM) in the presence of the Stark shift and a Kerr medium is studied. All terms in the Hamiltonian, such as the single-mode field, its interaction with the atom, the contribution of the Stark shift and the Kerr medium effects are considered to be f-deformed.In particular, the effect of the initial state of the radiation field on the dynamical evolution of some physical properties such as atomic inversion and entropy squeezing are investigated by considering different initial field states(coherent, squeezed and thermal states). 相似文献
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A.-S.F. Obada A.M. Abdel-Hafez M. Abdelaty 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1998,3(3):289-294
Phase properties of the field interacting with a two-level atom in a lossless cavity Jaynes-Cummings model, taking into account
the level shifts produced by Stark effect with an additional Kerr medium for one-mode are studied using the phase formalism
of Pegg and Barnett. It is shown in particular that phase properties of the field reflect the collapse and revival phenomena.
The results for the time evolution of the phase probability distribution and the phase fluctuations are obtained. The effect
of Stark shift on the phase properties in both the absence and presence of a Kerr medium is analyzed. Phase localization is
found for certain choice of the parameters.
Received: 27 March 1998 / Revised: 8 June 1998 / Accepted: 9 June 1998 相似文献
3.
Properties of Linear Entropy in k-Photon Jaynes-Cummings Model with Stark Shift and Kerr-Like Medium
The time evolution of the linear entropy of an taking into consideration Stark shift and Kerr-like medium. atom in k-photon daynes-Cummings model is investigated The effect of both the Stark shift and Kerr-like medium on the linear entropy is analyzed using a numerical technique for the field initially in coherent state and in even coherent state. The results show that the presence of the Kerr-like medium and Stark shift has an important effect on the properties of the entropy and entanglement. It is also shown that the setting of the initial state plays a significant role in the evolution of the linear entropy and entanglement. 相似文献
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Kerr介质中J-C模型的色散近似耗散动力学 总被引:1,自引:0,他引:1
应用全量子论研究了含Kerr介质的Jaynes-Cummings模型在色散近似下系统和子系统的相干性丢失及纠缠特性,在输入场为相干场假设下计算了线性熵.结果表明,原子相干性丢失与Kerr效应无关,场和原子-场系统的相干性丢失因Kerr介质的存在而增强,原子与场之间的纠缠因Kerr效应而受到压制,场的相干性时间演化规律在定性和定量两方面都受到腔耗的影响.Kerr介质对场线性熵的作用要通过腔耗才能展现出来. 相似文献
6.
附加克尔介质Jaynes-Cummings模型的场熵演化 总被引:8,自引:0,他引:8
研究了附加克尔(Kerr)介质Jaynes-Cummings(J-C)模型场熵演化的动力学特性,讨论了克尔介质非线性相互作用以及失谐量对场熵演化的影响. 相似文献
7.
原子与单模场相互作用中克尔效应与斯塔克效应的统一处理 总被引:11,自引:0,他引:11
处理了包含克尔效应和斯塔克效应的原子与场相互作用模型。由于在其有效哈密顿中作了旋转波近似,两种效应的影响可以归结为对原子与场失谐的改变,这种失谐变化依赖于一个系统的守恒量。研究表明,克尔效应和斯塔克效应在一定条件下是等价的。研究了当场的初态为宏观可区分量子迭加态时,光子的反聚束效应。探讨了在广义的克尔介质中原子与场相互作用模型的求解。 相似文献
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The Pancharatnam phase when an ideal cavity is filled with a Kerr-like medium and coupling is affected through a nondegenerate Raman two-photon process is studied. A careful investigation is made seeking exact results on the temporal evolution of atomic inversion and Pancharatnam phase. We invoke the mathematical notion of maximum variation of a function to construct a measure for Pancharatnam phase fluctuations. It is shown that Pancharatnam phase contains explicit information about the statistics of the field and atomic coherence, and is also shown that addition of the Kerr medium has an important effect on the properties of this phase. The results show that the effect of the Kerr medium changes the quasiperiod of the Pancharatnam phase evolution. The influence of Stark shift on the atomic inversion and the Pancharatnam phase in both presence and absence of the nonlinear medium is examined. General conclusions reached are illustrated by numerical results. 相似文献
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A.-S. F. Obada F. A. Mohammed H. A. Hessian A.-B. A. Mohamed 《International Journal of Theoretical Physics》2007,46(4):1027-1044
In this paper, we study the time evolution of the entropies and the degree of entanglement in the mixed state for a multi-quanta
JC model taking into consideration Stark shift and Kerr-like medium effect, we use a numerical method to investigate the time
evolution of the partial entropy of the atom and field subsystem. This is done in the framework of the multi-quanta presses
JC model with both the Stark shift and Kerr-like medium effect added. Furthermore, we examine the effect of the superposition
states and a statistical mixture of coherent states as an initial field on the entropies and entanglement. Our results show
that the setting of the initial state play an important role in the evolution of the sub-entropies and entanglement. 相似文献
12.
Kerr介质腔中“单模光场-V型三能级原子系统”的场熵演化特性 总被引:7,自引:1,他引:6
利用全量子理论,研究了附加Kerr介质腔中“V”型三能级原子与单模相干态光场相互作用的场熵演化规律,讨论了Kerr效应和初始场的平均光子数n(初始场强)对场熵演化的影响. 相似文献
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压缩真空场与原子非线性作用系统中场熵的压缩特性 总被引:2,自引:0,他引:2
利用量子信息熵理论,研究了附加克尔介质的压缩真空场与二能级原子依赖强度耦合相互作用系统中场熵的压缩特性.讨论了初始压缩真空场的压缩度以及克尔非线性作用的强度对场熵压缩特性的影响.结果表明,无克尔介质量,场熵压缩的演化具有严格的周期性.克尔介质的非线性作用的强弱可以改变场熵压缩的周期性.在初始压缩真空场的压缩度较大(r=5)时,无论克尔介质作用的强弱如何变化,场熵始终处于被压缩状态. 相似文献
16.
Partial entropy change and entanglement in the mixed state for a Jaynes-Cummings model with Kerr medium 下载免费PDF全文
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. 相似文献
17.
The influence of the nonlinear Stark shift, for the multi-quanta JCM in the presence of phase damping is studied. In particular the temporal evolution of the atomic inversion, the linear entropy and the entropy squeezing are investigated. The linear entropy is used as an indicator of the degree of entanglement between the atom and the field. The results indicate the sensitivity of these aspects to changes either in the decay parameter or the Stark shift parameter. 相似文献
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Kerr效应对非线性Jaynes-Cummings模型场熵和缠结的影响 总被引:4,自引:2,他引:2
Phoenix和Knight提出的量子熵理论,用量子熵作为缠结程度的量度,研究了附加克尔介质依赖强度耦合Jaynes-Cummings模型场熵演化的动力学特性和原子-场的缠结特性,详细地讨论了克尔效应及初始相干光场的强弱对场熵演化特性和原子-场缠结特性的影响,并与原子反转特性相比较.结果表明:在初始相干光场较弱时(n=10),克尔介质的非线性相互作用破坏了场熵演化的周期性,原子-场不再周期消缠结.但在初始相干光场较强时(n=50),克尔介质非线性相互作用只是使场熵演化的周期性减弱,场熵的演化仍近似地有周期性,原子-场仍周期消缠结,克尔效应越强,周期越小.当克尔介质与光场强耦合相互作用时(χ/g=5),原子-场持续消缠结. 相似文献
19.
研究了斯塔克(Stark)效应对两模双光子Jaynes-Cummings(J-C)模型腔场谱的影响,推导计算出了腔场处于光子数态时腔场谱的计算公式和数值结果,讨论了斯塔克效应和初始场强对腔场谱的影响。发现斯塔克效应在弱场条件下对腔场谱线的频率和强度都有明显的影响,破坏了谱结构的对称性,使两模的谱线更加丰富。初始场较强时斯塔克效应对谱线的影响较弱。模Ⅰ为真空场、模Ⅱ初始场强递增时,斯塔克效应使模Ⅱ的高频峰受到较强的抑制作用,其低频峰在初始场较弱时受到抑制,初始场较强时又有强化作用,初始场更强时,模Ⅱ的谱线退化为经典的共振荧光谱,与无斯塔克效应的情况基本相同。 相似文献
20.
M. S. Ateto 《International Journal of Theoretical Physics》2010,49(2):276-292
The wave function of a system governed by the time-dependent nonlinear Jaynes-Cummings (JC) model is obtained. We compute
analytically the eigenvalues of the reduced field density operator by which the dynamics of the entropy of entanglement of
the cavity field are analyzed. The influences of the atomic motion, the field-mode structure and the Kerr-like medium on this
phenomenon are illustrated. The population dynamics of an excited atom is also discussed for the same set of parameters. The
cavity field is assumed to be initially excited in either a Fock or a coherent states. The cavity excitation in a Fock state
generates a class of an entanglement without death with fixed amplitude by adjusting the parameters of the atomic motion as
well as the Kerr and the field-mode structure. In case of a coherent cavity, the only phenomenon to be noted is the periodical
behavior of the dynamics under study when the atomic motion is considered. Although the Kerr medium affects the strength of
the entanglement negatively, the entropy of entanglement loses its zeros where the Kerr is taken into consideration. 相似文献