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中国工程科学:英文版

The entanglement evolution of two coupling two-level atoms interacting with a single-mode vacuum field in multiphoton Tavis-Cummings model

Lǔ, Dao-Ming

Published Jan 1, 2012• 0 citations
OpenAlex

Abstract

用 multipohton Tavis-Cummings 模型,在贝尔联合二水平的原子说与一块单个模式的真空地交往的二的纠纷进化被使用否定性调查。在二的纠纷进化上联合在原子,原子起始的状态和转变的光子数字之间的常数联合二水平的原子的影响被讨论。用二个原子的纠纷与联合在原子,原子起始的状态和光子之间的常数是相关的数字方法表演获得的结果转变数。当起始的状态是 11 时,二原子的纠纷状态将永远呆在最大的纠纷状态。当二个原子的起始的状态是 01 时,二个原子的纠纷显示周期的摆动行为。并且它有联合在原子或光子之间的常数增加的摆动时期减少转变数。在另一方面,当起始的状态是 00 或 10 时,二个原子的纠纷与联合在原子或转变的光子数字之间的常数增加显示 quasiperiodic 摆动行为和它的摆动时期减少。

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用 multipohton Tavis-Cummings 模型,在贝尔联合二水平的原子说与一块单个模式的真空地交往的二的纠纷进化被使用否定性调查。在二的纠纷进化上联合在原子,原子起始的状态和转变的光子数字之间的常数联合二水平的原子的影响被讨论。用二个原子的纠纷与联合在原子,原子起始的状态和光子之间的常数是相关的数字方法表演获得的结果转变数。当起始的状态是 11 时,二原子的纠纷状态将永远呆在最大的纠纷状态。当二个原子的起始的状态是 01 时,二个原子的纠纷显示周期的摆动行为。并且它有联合在原子或光子之间的常数增加的摆动时期减少转变数。在另一方面,当起始的状态是 00 或 10 时,二个原子的纠纷与联合在原子或转变的光子数字之间的常数增加显示 quasiperiodic 摆动行为和它的摆动时期减少。
纠纷被用来测量在分开的分系统之间的关联, von Neumann 熵被用来在和处于协调状态准备的领域的在原子之间的相互作用的过程学习原子的纠纷的进化。纠纷上的地紧张和 detuning 的效果被调查。纠纷与增加领域紧张在它的进化,他们的振幅和吝啬的价值减少展出了摆动,这被显示出。有 detuning 的摆动频率增加,而是最大的价值几乎独立于 detuning。关键词纠纷 - 纠缠的状态 - Jaynes-Cummings 模型 PACS2001 42.50 .-P
Using Tavis-Cummings model,the evolution of the atom's occupancy in interaction of two coupling two-level atoms with the single mode coherent field through multiphoton transition is studied.The influences of coupling coefficient between atoms,the initial mean photon number of field and the degree of entanglement of two atoms on the evolution of the atom's occupancy are discussed.The results obtained by numerical calculations show that the initial mean photon number of field influences violently the evolution properties of the atom's occupancy,the influence of coupling coefficient between atoms may be neglected,and the degree of entanglement of two atoms influences the reverse of atoms.
利用全量子理论,研究了多光子Jaynes—Cummings模型中混合态原子与Glauber-Lachs态相互作用系统的量子纠缠特性,讨论了相干平均光子数、热平均光子数、原子初态和跃迁光子数对系统纠缠特性的影响。结果表明,系统的纠缠度是相干平均光子数、热平均光子数的非单调函数;随着跃迁光子数的增加,系统的纠缠度的振荡频率明显增加,系统的平均纠缠度有减小趋势;原子初态对系统的纠缠度有明显影响,原子初态虽然趋于基态和趋于激发态的程度相同,但对系统的平均纠缠度的影响是不同的;原子初态的混合程度越大,跃迁光子数对系统的平均纠缠度的破坏作用越明显。
The entanglement degrees of two coupling-atoms interacting with a single-mode vacuum field in the Tavis-Cummings model were investigated by using quantum relative entropy.The influence of the dipole-dipole interaction between atoms on the entanglement degrees of the relative entropy was discussed.The results indicated that the entanglement degrees of atom-atom and atom-field evolved periodically with the antiphase.The increase of the atomic dipole-dipole coupling led to the increase of evolution period,the constant of atom-atom entanglement degree while the decrease of atom-field entanglement degree.