2009/07/31 by Elias Amselem, Magnus Radmark, Mohamed Bourennane +1 · 2 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.103.160405
published as Phys. Rev. Lett. 103 (2009) 160405 · REVTeX4, 4 pages, 5 figures
arxiv created 2009/10/18 · arxiv updated 2009/12/01
We present an experimental state-independent violation of an inequality for noncontextual theories on single particles. We show that 20 different single-photon states violate an inequality which involves correlations between results of sequential compatible measurements by at least 419 standard deviations. Our results show that, for any physical system, even for a single system, and independent of its state, there is a universal set of tests whose results do not admit a noncontextual interpretation. This sheds new light on the role of quantum mechanics in quantum information processing.