Experimental violation of a Bell-like inequality with optical vortex beams

2015/05/22 by B. Stoklasa, L. Motka, J. Rehacek +3
Physics and Astronomy · #quant-ph

paper · pdf · doi:10.1088/1367-2630/17/11/113046

6 pages, 4 eps-color figures. Comments welcome!

arxiv created 2015/05/22 · arxiv updated 2015/12/09

Abstract

Optical beams with topological singularities have a Schmidt decomposition. Hence, they display features typically associated with bipartite quantum systems; in particular, these classical beams can exhibit entanglement. This classical entanglement can be quantified by a Bell inequality formulated in terms of Wigner functions. We experimentally demonstrate the violation of this inequality for Laguerre-Gauss (LG) beams and confirm that the violation increases with increasing orbital angular momentum. Our measurements yield negativity of the Wigner function at the origin for \LG₁₀ beams, whereas for \LG₂₀ we always get a positive value.

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