A method of storing and retrieving quantum states of radiation fields using the ground-state coherences is discussed. We demonstrate the generation of multiparticle entangled states starting from atoms prepared in a coherent state. Use is made of the j=-1/2 to +1/2 atomic transition and its interaction with a far-detuned elliptically polarized field.
@article{arxiv.quant-ph/0402116,
title = {Quantum holography and multiparticle entanglement using ground-state coherences},
author = {G. S. Agarwal and P. Lougovski and H. Walther},
journal= {arXiv preprint arXiv:quant-ph/0402116},
year = {2007}
}