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One-Step Synthesis of Multiatom Greenberger-Horne-Zeilinger States

2001; American Physical Society; Volume: 87; Issue: 23 Linguagem: Inglês

10.1103/physrevlett.87.230404

1092-0145

Shi-Biao Zheng,

Cold Atom Physics and Bose-Einstein Condensates

A scheme is proposed for generating maximally entangled Greenberger-Horne-Zeilinger (GHZ) atomic states for testing quantum nonlocality. In the scheme, three atoms are simultaneously sent through a nonresonant cavity in a vacuum state. They are initially in the same state, and thus there is no energy exchange in the process. The cavity-assisted collision results in a phase-shift which depends upon the collective atomic excitations. In principle, the scheme can be generalized to generate N-atom GHZ states. The scheme is insensitive to cavity decay and requires only one cavity, providing new prospects for testing fundamental aspects of quantum mechanics and for quantum information processing.