Experimental generalized contextuality with single-photon qubits
arXiv:1505.06825 · doi:10.1364/OPTICA.4.000966
Abstract
Contextuality is a phenomenon at the heart of the quantum mechanical departure from classical behaviour, and has been recently identified as a resource in quantum computation. Experimental demonstration of contextuality is thus an important goal. The traditional form of contextuality -- as violation of a Kochen-Specker inequality -- requires a quantum system with at least three levels, and the status of the assumption of determinism used in deriving those inequalities has been controversial. By considering `unsharp' observables, Liang, Spekkens and Wiseman (LSW) derived an inequality for generalized noncontextual models that doesn't assume determinism, and applies already to a qubit. We experimentally implement the LSW test using the polarization states of a heralded single photon and three unsharp binary measurements. We violate the LSW inequality by more than 16 standard deviations, thus showing that our results cannot be reproduced by a noncontextual subset of quantum theory.
7 pages, 3 figure + supplementary information. To appear in Optica
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- Entanglement-enhanced quantum metrology in a noisy environment
- Experimental Certification of Sustained Entanglement and Nonlocality after Sequential Measurements
- Experimental certification of contextuality, coherence and dimension in a programmable universal photonic processor
- Enhanced violations of Leggett-Garg inequalities in an experimental three-level system
- Contextuality in entanglement-assisted one-shot classical communication
- Beyond the Cabello-Severini-Winter framework: Making sense of contextuality without sharpness of measurements
- Experimental orthogonalization of highly overlapping quantum states with single photons
- Experimental entropic test of state-independent contextuality via single photons
- Joint measurability structures realizable with qubit measurements: incompatibility via marginal surgery
- Experimentally ruling out joint reality based on operational completeness