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Phys. Rev. A 77, 032108 (2008) [6 pages]

Generalized Ardehali-Bell inequalities for graph states

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Otfried Gühne1,2,* and Adán Cabello3,†
1Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, A-6020 Innsbruck, Austria
2Institut für Theoretische Physik, Universität Innsbruck, A-6020 Innsbruck, Austria
3Departemento de Física Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain

Received 5 November 2007; published 21 March 2008

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

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.032108
DOI:
10.1103/PhysRevA.77.032108
PACS:
03.65.Ud, 03.67.Lx, 03.67.Pp

*otfried.guehne@uibk.ac.at

†adan@us.es

 
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