Physics – Quantum Physics
Scientific paper
2011-08-12
J. Phys. B: At. Mol. Opt. Phys. 45 (2012) 035503
Physics
Quantum Physics
16 pages, 10 figures, extended version of arXiv:1004.1834v2
Scientific paper
10.1088/0953-4075/45/3/035503
We analyze the time evolution of quantum entanglement in a model consisting of two two-level atoms interacting with a two-mode electromagnetic field for a variety of initial states and interatomic separations. We study two specific atomic separations which give rise to symmetric atom-field couplings. For general atomic distances we consider a subset of initial states analytically, and then treat the more general situation numerically. We examine a variety of qualitative features such as entanglement sudden death, dynamical generation, protection, and transfer between subsystems. Our analysis shows a stark contrast in features of entanglement between the two special coupling schemes often considered; further, these features are uncharacteristic of those arising for general distances, due to the high degree of symmetry present in the special cases. The variety of behaviors in these two-mode cases suggest the importance of considering atomic separation carefully for any model where two atoms interact with a common field.
Cummings Nick I.
Hu Liang-Bin
Sinha Kaneenika
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