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State-Independent Quantum Contextuality with Single Photons

2009; American Physical Society; Volume: 103; Issue: 16 Linguagem: Inglês

10.1103/physrevlett.103.160405

1092-0145

Elias Amselem, Magnus Rådmark, Mohamed Bourennane, Adán Cabello,

Quantum Computing Algorithms and Architecture

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.