We discuss the generation of a macroscopic entangled state in a single atom cavity-QED system. The three-level atom in a cascade configuration interacts dispersively with two classical coherent fields inside a doubly resonant cavity. We show that a macroscopic entangled state between these two cavity modes can be generated under large detuning conditions. The entanglement persists even under the presence of cavity losses.
@article{arxiv.quant-ph/0607213,
title = {Single-atom as a macroscopic entanglement source},
author = {Ling Zhou and Han Xiong and M. Suhail Zubairy},
journal= {arXiv preprint arXiv:quant-ph/0607213},
year = {2009}
}