共查询到17条相似文献,搜索用时 672 毫秒
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岳转林 《原子与分子物理学报》2015,32(6)
研究耗散腔中, 二能级原子与单模辐射场在相互作用过程中熵关联的情况. 结果表明:原子与场之间存在熵交换现象, 更重要的是证明了它们之间的熵交换需要满足一定的条件. 同时也计算了原子与场之间的纠缠, 发现两子系统间熵交换与纠缠的关系. 相似文献
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文章利用一对处于纠缠态的-型三能级原子与一对处于纠缠态的单模腔场,初始时刻原子与腔场之间互不纠缠,使其中一个原子与一个腔场发生相互作用,即纠缠交换,合适选择相互作用时间就可实现原子与腔场之间产生纠缠,并研究了系统原子熵的演化特性,运用量子熵理论,讨论了原子-腔场的耦合常数对原子熵的影响,结果表明:原子与光场跃迁耦合常数对系统熵的最大纠缠度有影响.当原子与光场两种跃迁耦合常数之比k值增大时,最大纠缠度在减小;当k增大到某一程度时,系统熵随时间周期性变化,并出现双峰现象。 相似文献
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考虑一个运动的二能级原子与单模热光场经由多光子过程相互作用, 利用量子约化熵理论研究原子与场之间的熵交换、用Concurrence量度原子与场之间的纠缠, 讨论原子初态、原子运动、热场平均光子数以及跃迁光子数对熵交换和纠缠的影响. 结果表明: 考虑原子运动时, 原子和光场熵变呈现周期性, 且发生熵交换现象; 与热光场的相互作用导致运动原子与场纠缠, 多光子过程有利于纠缠加强. 在原子和光场熵变均为零处, 纠缠也为零. 相似文献
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考虑一个运动的二能级原子与单模热光场强度相关耦合,采用量子约化熵研究原子和场的约化熵变化规律、原子与场的熵交换,用共生纠缠度研究原子与场的纠缠。并借助于数值计算方法,详细分析了在强度相关耦合J-C模型中,原子初态、热光场的平均光子数以及场模结构参数对熵交换和纠缠的影响。结果表明原子与光场的熵交换和纠缠均周期性地演化。选择适当的原子初态,可以使得原子的约化熵和光场的约化熵完全交换,这意味着原子与光场反相关。此外,场模结构参数增加导致熵交换的幅度减小,周期缩短。原子与热光场的纠缠随平均光子数的增加而减弱。 相似文献
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利用全量子理论,研究了运动纠缠双原子与薛定谔猫态光场相互作用系统的场熵演化特性,讨论了光场强弱、相干态间的相位角、原子的运动和场模结构参数对系统场熵的影响.结果表明:原子运动导致场熵演化具有周期性;当场强较弱时,奇相干态光场与运动原子的纠缠度最大,而偶相干态光场与运动原子的纠缠度最小, Yurke-Stoler相干态光场与运动原子的纠缠度值介于中间;当场强足够大时,分别处于Yurke-Stoler相干态,奇相干态和偶相干态的光场与运动原子的纠缠度相等,场熵演化特性相同;随着原子运动速度的增大或场模结构参数的增大,场熵的演化周期缩短,并且场与原子的纠缠度逐渐减弱. 相似文献
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We study the entropy correlations between subsystems in a bipartite system.Our results show that there is an entropy exchange effect(i.e.,anticorrelation phenomenon) between atom and field.Especially we prove that there exists a condition for complete entropy exchange between atom and field. 相似文献
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Properties of field quantum entropy evolution in the Jaynes--Cummings model with initial squeezed coherent states field 下载免费PDF全文
The properties of the field quantum entropy evolution in a system of
a single-mode squeezed coherent state field interacting with a
two-level atom is studied by utilizing the complete quantum theory,
and we focus our attention on the discussion of the influences of
field squeezing parameter $\gamma $, atomic distribution angle
$\theta $ and coupling strength $g$ between the field and the atom
on the properties of the evolution of field quantum entropy. The
results obtained from numerical calculation indicate that the
amplitude of oscillation of field quantum entropy evolution
decreases with the increasing of squeezing parameter $\gamma $, and
that both atomic distribution angle $\theta $ and coupling strength
$g$ between the field and the atom can influence the periodicity of
field quantum entropy evolution. 相似文献
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Entropy squeezing of the field interacting with a nearly degenerate V-type three-level atom 下载免费PDF全文
The position- and momentum-entopic squeezing properties of the optical field in the system of a nearly degenerate three-level atom interacting with a single-mode field are investigated. Calculation results indicate that when the field is initially in the vacuum state, it may lead to squeezing of the position entropy or the momentum entropy of the field if the atom is prepared properly. The effects of initial atomic state and the splitting of the excited levels of the atom on field entropies are discussed in this case. When the initial field is in a coherent state, we find that position-entropy squeezing of the field is present even if the atom is prepared in the ground state. By comparing the variance squeezing and entropy squeezing of the field we confirm that entropy is more sensitive than variance in measuring quantum fluctuations. 相似文献
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The effect of degenerate atomic levels on the field state dissipation in two—photon Jaynes—Cummings model 下载免费PDF全文
The dissipation of the field in the two-photonJaynes-Cummings model (JCM) with degenerate atomic levels was studied.The initial degenerate atomic state affects the field coherence loss,when the degenerate atom is initially in an equal probability superposition state,the field coherence loss is smallest,It is found that the degeneracy of the atomic level increases the period of entanglement between the atom and the field.When the degeneracy was considered,the coherence properties of the field could be affected by the reservoir qualitatively,if a nonlinear two-photon process is involved.This is different from the dissipation of one-photon JCM with degenerate atomic levels. 相似文献