Nonclassicality thresholds for multiqubit states: Numerical analysis

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Jacek Gruca, Wiesław Laskowski, Marek Żukowski, Nikolai Kiesel, Witlef Wieczorek, Christian Schmid, and Harald Weinfurter
Phys. Rev. A 82, 012118 (2010)

States that strongly violate Bell’s inequalities are required in many quantum-informational protocols as, for example, in cryptography, secret sharing, and the reduction of communication complexity. We investigate families of such states with a numerical method which allows us to reveal nonclassicality even without direct knowledge of Bell’s inequalities for the given problem. An extensive set of numerical results is presented and discussed.