Realization of atomic Greenberger-Horne-Zeilinger states via cavity quantum electrodynamics

In this work we propose a scheme in which it is possible to generate atomic Greenberger-Horner-Zeilinger (GHZ) states by letting three-level atoms in a lambda configuration interact with a cavity field followed by a displacem ent of the cavity held and selective measurements on two-level atoms which disentangle the atoms and field stales. We also propose a GHZ test based on such states.