Eur. Phys. J. D 30, 275-278 (2004)
https://doi.org/10.1140/epjd/e2004-00086-2

Scheme for the generation of entangled atomic state in cavity QED

¹ Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, P.R. China
² Department of Chemistry, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk-Antwerp, Belgium
³ Department of Physics, Blk S12, National University of Singapore 2, Science Drive 3, 117542 Singapore

Corresponding author: ^a xlfeng@mail.siom.ac.cn

Received: 3 April 2003
Revised: 20 February 2004
Published online: 6 July 2004

Abstract

We propose a scheme to generate the entangled state of two -type three-level atoms trapped in a cavity. The atoms are initially prepared in their excited state and the cavity in vacuum state. Each atom has two possibilities to deexcite to one of the ground states. If two different polarized photons are detected subsequently, it is sure that both atoms are in different ground states. But which atom is in which ground state cannot be determined, the atoms are thus prepared in a superposition of two ground states, i.e., an entangled state. In comparison with the proposal of Hong and Lee [Phys. Rev. Lett. 89, 237901 (2002)], the requirement of a single polarized photon source can be avoided in our scheme.