2010/06/02 by Jeffrey Bub, Bub, Jeffrey, Allen Stairs +1
Physics and Astronomy · #FOS: Physical sciences #Quantum Physics (quant-ph) #quant-ph
paper · pdf · doi:10.48550/arxiv.1006.0500
10 pages, 3 figures; revised version adds acknowledgment of independent work on the 2-particle experiment, and clarifies remarks re the 1-particle experiment and the argument re the 2-particle experiment in section 2
arxiv created 2010/06/17 · arxiv updated 2010/06/21
The Klyachko inequality is an inequality for the probabiities of the values of five observables of a spin-1 particle, which is satisfied by any noncontextual assignment of values to this set of observables, but is violated by the probabilities defined by a certain quantum state. We describe an experiment between two entangled spin-1 particles to test contextuality via a related inequality. We point out that a test of contextuality by measurements on a single particle to confirm the Klyachko inequality requires an assumption of non-disturbance by the measuring instrument, which is avoided in the two-particle experiment.