Phys. Rev. Lett. 103, 160405 (2009) [4 pages]State-Independent Quantum Contextuality with Single PhotonsReceived 12 August 2009; published 16 October 2009 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.160405
DOI:
10.1103/PhysRevLett.103.160405
PACS:
03.65.Ta, 03.65.Ud, 42.50.Xa
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