Nonlocality tests of Bell Inequalities and of Hardy's "ladder theorem" without "supplementary assumptions"

Abstract

We have experimentally tested the non local properties of the states generated by a high brilliance source of entanglement which virtually allows the direct measurement of the full set of photon pairs created by the basic QED process implied by the parametric quantum scattering. Standard Bell measurements and Bell's inequality violation test have been realized over the entire cone of emission of the degenerate pairs. By the same source we have verified the Hardy's ladder theory up to the 20th step and the contradiction between the standard quantum theory and the local realism has been tested for 41% of entangled pairs. PACS: 03.65.Ud, 03.67.Mn, 42.65.Lm