Dynamics of multiple atoms in one-dimensional fields
Dynamics of multiple atoms in one-dimensional fields
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DOI：
10.1103/physreva.99.013845
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发表时间：
2018-01
影响因子：
2.9
通讯作者：
Carl A. Cascio;Jad C. Halimeh;I. McCulloch;A. Recati;I. D. Vega
中科院分区：
文献类型：
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作者：
Carl A. Cascio;Jad C. Halimeh;I. McCulloch;A. Recati;I. D. Vega
我们分析了一组两能级原子与波导内电磁环境耦合的动力学。这个问题通常通过假设原子和环境之间的弱耦合以及相关的马尔可夫近似来解决。我们表明，这种近似的准确性可能比在单原子情况下更有限，也可能由原子-原子相互作用产生的集体效应的存在强烈地决定。为此，我们用精确对角化和时变密度矩阵重整化群方法解决了全问题，并将结果与弱耦合主方程和Dicke近似的结果进行了比较。最后，在考虑原子间距离和原子频率的情况下，研究了系统内纠缠的动力学。
We analyze the dynamics of a set of two-level atoms coupled to the electromagnetic environment within a waveguide. This problem is often tackled by assuming a weak coupling between the atoms and the environment as well as the associated Markov approximation. We show that the accuracy of such an approximation may be more limited than in the single-atom case and may also be strongly determined by the presence of collective effects produced by atom-atom interactions. To this aim, we solve the full problem with exact diagonalization and also the time-dependent density matrix renormalization group method, and we compare the result to that obtained within a weak-coupling master equation and with the Dicke approximation. Finally, we study the dynamics of the entanglement within the system when considering several interatomic distances and atomic frequencies.