One-step preparation of three-particle Greenberger-Horne-Zeilinger states in cavity quantum electrodynamics

We propose two schemes to one-step generate the three-particle Greenberger-Horne-Zeilinger state based on the resonant atom-cavity fields interaction. The whole process may be realized experimentally providing that simple apparatus, initial conditions, and some manipulation in principle are achieved. Finally, in the current or the near future experiment parameter, we show that the proposed schemes can maintain the state with high fidelity under the condition of atomic spontaneous emission and decay of cavity fields. (C) 2012 Optical Society of America