We experimentally observed the violation of Kujula-Dzhafarov noncontextuality inequalities by non-separable spin-orbit laser modes. Qubits are encoded on polarization and transverse modes of an intense laser beam. A spin-orbit non-separable mode was produced by means of a radial polarization converter (S-plate). The results show that contextuality can be investigated by using spin-orbit modes in a simple way, corroborating recent works stating that such system can emulate single-photon experiments. Additionally, an improvement in the non-separable mode preparation allowed us to observe a greater violation of the Clauser-Horne-Shimony-Holt inequality for such system. The results are in very good agreement with the theoretical predictions of quantum mechanics.
@article{arxiv.1807.05567,
title = {Contextuality in spin-orbit laser modes},
author = {M. H. M. Passos and W. F. Balthazar and J. Acacio de Barros and C. E. R. Souza and A. Z. Khoury and J. A. O. Huguenin},
journal= {arXiv preprint arXiv:1807.05567},
year = {2019}
}