We study a special two-atom entanglement case in assumed Cavity QED experiment in which only one atom effectively exchanges a single photon with a cavity mode. We compute diatom entanglement under position-dependent atomic resonant dipole-dipole interaction (RDDI) for large interatomic separation limit. We show that the RDDI, even which is much smaller than the maximal atomic Rabi frequency, can induce distinct diatom entanglement. The peak entanglement (PE) reaches a maximum when RDDI strength can compare with the Rabi frequency of an atom.
@article{arxiv.quant-ph/0512211,
title = {A position dependent atom-atom entanglement in real-time Cavity QED system},
author = {Yan-Qing Guo and Hai-Jing Cao and He-Shan Song},
journal= {arXiv preprint arXiv:quant-ph/0512211},
year = {2009}
}