A two-qubit Bell inequality for which POVM measurements are relevant

Details A two-qubit Bell inequality for which POVM measurements are relevant A two-qubit Bell inequality for which POVM measurements are relevant

2010-07-15

arxiv.org/abs/1007.2578v1

Phys. Rev. A 82, 062115 (2010)

Physics

Quantum Physics

7 pages, 1 figure

Scientific paper

A bipartite Bell inequality is derived which is maximally violated on the two-qubit state space if measurements describable by positive operator valued measure (POVM) elements are allowed rather than restricting the possible measurements to projective ones. In particular, the presented Bell inequality requires POVMs in order to be maximally violated by a maximally entangled two-qubit state. This answers a question raised by N. Gisin.

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