We present a new and feasible test proving quantum contextuality in four-dimensional Hiltbert space. In our scheme, a contradiction between quantum mechanics and noncontextual hidden variables is revealed through the measurement statistics of two joint measurements of an ensemble of non-entangled qubits. The origin of nonclassicality is fully attributed to the measurement process. Quantum optical realization using photon pairs and linear optics are presented.
@article{arxiv.0805.3398,
title = {Proposed Experimental Test for Proving Quantum Contextuality with Non-entangled Photons},
author = {Yoshihiro Nambu},
journal= {arXiv preprint arXiv:0805.3398},
year = {2008}
}