State-independent quantum contextuality with single photons
arXiv:0907.4494 · doi:10.1103/PhysRevLett.103.160405
Abstract
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.
REVTeX4, 4 pages, 5 figures
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