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APS » Journals » Physical Review Letters » Generalized Ardehali-Bell inequalities for graph states

January 2008, to be published in Physical Review A

Generalized Ardehali-Bell inequalities for graph states
Otfried G{\"u}hne and Ad\ ' { a} n Cabello

We derive Bell inequalities for graph states by generalizing the approach proposed by Ardehali [Phys. Rev. A {\bf 46}, 5375 (1992)] for Greenberger-Horne-Zeilinger (GHZ) states. Using this method, we demonstrate that Bell inequalities with non-stabilizer observables are often superior to the optimal GHZ-Mermin-type (or stabilizer-type) Bell inequalities.

© 2008 The American Physical Society.