Faithful test of non-local realism with entangled coherent states

Details Faithful test of non-local realism with entangled coherent states Faithful test of non-local realism with entangled coherent states

2011-01-20

arxiv.org/abs/1101.3917v1

Phys. Rev. A 83, 022102 (2011)

Physics

Quantum Physics

8 pages, 6 figures, to be published in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.83.022102

We investigate the violation of Leggett's inequality for non-local realism using entangled coherent states and various types of local measurements. We prove mathematically the relation between the violation of the Clauser-Horne-Shimony-Holt form of Bell's inequality and Leggett's one when tested by the same resources. For Leggett inequalities, we generalize the non-local realistic bound to systems in Hilbert spaces larger than bidimensional ones and introduce an optimization technique that allows to achieve larger degrees of violation by adjusting the local measurement settings. Our work describes the steps that should be performed to produce a self-consistent generalization of Leggett's original arguments to continuous-variable states.

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