# Contextuality in Quantum Mechanics: Testing the Klyachko Inequality - Quantum Physics

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Abstract: The Klyachko inequality is an inequality for the probabiities of the valuesof five observables of a spin-1 particle, which is satisfied by anynoncontextual assignment of values to this set of observables, but is violatedby the probabilities defined by a certain quantum state. We describe anexperiment between two entangled spin-1 particles to test contextuality via arelated inequality. We point out that a test of contextuality by measurementson a single particle to confirm the Klyachko inequality requires an assumptionof non-disturbance by the measuring instrument, which is avoided in thetwo-particle experiment.

Author: ** Jeffrey Bub, Allen Stairs**

Source: https://arxiv.org/