Variants of Bell inequalities

Details Variants of Bell inequalities Variants of Bell inequalities

2006-11-13

arxiv.org/abs/quant-ph/0611126v1

Physics

Quantum Physics

8 pages

Scientific paper

A family of Bell-type inequalities is present, which are constructed directly from the "standard" Bell inequalities involving two dichotomic observables per site. It is shown that the inequalities are violated by all the generalized Greenberger-Horne-Zeilinger states of multiqubits. Remarkably, our new inequalities can provide stronger non-locality tests in a sense that the local reality inequalities are exponentially stronger than the corresponding multipartite separability inequalities. This reveals that the exponential violation of local realism by separable states is an interesting consequence of quantum fluctuation of multipartite systems.

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