RT Journal Article
T1 Experimental violation of a Bell-like inequality with optical vortex beams
A1 Stoklasa, B.
A1 Motka, L.
A1 Řeháček, J.
A1 Hradil, Z.
A1 Sánchez Soto, Luis Lorenzo
A1 Agarwal, Girish S.
AB 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 experimental scheme, which is designed to give directly the parity of the Wigner function, yields negativity at the origin for LG_10 beams, whereas for LG_20 we always get a positive value.
PB IOP Publishing
SN 1367-2630
YR 2015
FD 2015-11
LK https://hdl.handle.net/20.500.14352/24324
UL https://hdl.handle.net/20.500.14352/24324
LA eng
NO ©2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. We acknowledge illuminating discussions with Gerd Leuchs, Elisabeth Giacobino, and Andrea Aiello. This work was supported by the Grant Agency of the Czech Republic (Grant 15-031945), the European Social Fund and the State Budget of the Czech Republic POSTUP II (Grant CZ.1.07/2.3.00/30.0041), the IGA of Palacky University (Grant PrF-2015-002), and the UCM-BSCH Program (Grant GR3/14).
NO Grant Agency of the Czech Republic
NO State Budget of the Czech Republic POSTUP II
NO IGA of Palacky University
NO UCM-BSCH Program
NO Banco Santander Central Hispano (BSCH)
NO Universidad Complutense de Madrid (UCM)
DS Docta Complutense
RD 20 abr 2025