Preparation of multiatom entangled states through dispersive atom–cavity-field interactions

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Abstract
A technique based on a dispersive atom–cavity-field interaction is proposed for preparing two or more atoms in macroscopically separated entangled states. After suitably prepared atoms interact with the cavity field a subsequent measurement on this field projects the atoms onto the entangled states. Two-particle entangled states are discussed as well as a three-particle state of the type proposed by Greenberger, Horne, and Zeilinger. © 1996 The American Physical Society.