Verifying Atom Entanglement Schemes by Testing Bell's Inequality

Dimitris G. Angelakis 1 , Almut Beigea 1 , 2 , Peter L. Knight 1 , William J. Munro 1 , 3  and Ben Tregenn 1
  • 1 Optics Section, Blackett Laboratory, Imperial College, London SW7 2BW, England
  • 2 Max-Planck-Institute for Quantum Optics, Hans-Kopfermann-Straße 1, D-85748 Garching
  • 3 Special Research Centre for Quantum Computer Technology, The University of Queensland, 4072 Brisbane, Australia; Present address: Hewlett-Packard Laboratories, Filton Road, Stoke Gifford, Bristol BS34 8QZ, UK


Recent experiments to test B ell's inequality using entangled photons and ions aimed at tests of basic quantum mechanical principles. Interesting results have been obtained and many loopholes could be closed. In this paper we want to point out that tests of Bell's inequality also play an important role in verifying atom entanglement schemes. We describe as an example a scheme to prepare arbitrary entangled states of N two-level atoms using a leaky optical cavity and a scheme to entangle atoms inside a photonic crystal. During the state preparation no photons are emitted, and observing a violation of B ell's inequality is the only way to test whether a scheme works with a high precision or not.

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A Journal of Physical Sciences: Zeitschrift für Naturforschung A (ZNA) is an international scientific journal which publishes original research papers from all areas of experimental and theoretical physics. In accordance with the name of the journal, which means “Journal for Natural Sciences”, manuscripts submitted to ZNA should have a tangible connection to actual physical phenomena.