Recently, an inequality satisfied by non-contextual hidden-variable models and violated by quantum mechanics for all states of a four-level system has been derived based on information-theoretic distance approach to non-classical correlations. In this work, we experimentally demonstrate violation of this inequality with single photons. Our experiment offers a method to study a distinction between quantum and classical correlations from an information-theoretic perspective.
@article{arxiv.2001.01498,
title = {Experimental entropic test of state-independent contextuality via single photons},
author = {Dengke Qu and Pawel Kurzynski and Dagomir Kaszlikowski and Sadegh Raeisi and Lei Xiao and Kunkun Wang and Xiang Zhan and Peng Xue},
journal= {arXiv preprint arXiv:2001.01498},
year = {2020}
}