Compatibility and noncontextuality for sequential measurements

Details Compatibility and noncontextuality for sequential measurements Compatibility and noncontextuality for sequential measurements

2009-12-24

arxiv.org/abs/0912.4846v2

Phys. Rev. A 81, 022121 (2010)

Physics

Quantum Physics

15 pages, 2 figures, v2: problem with latex solved

Scientific paper

10.1103/PhysRevA.81.022121

A basic assumption behind the inequalities used for testing noncontextual hidden variable models is that the observables measured on the same individual system are perfectly compatible. However, compatibility is not perfect in actual experiments using sequential measurements. We discuss the resulting "compatibility loophole" and present several methods to rule out certain hidden variable models which obey a kind of extended noncontextuality. Finally, we present a detailed analysis of experimental imperfections in a recent trapped ion experiment and apply our analysis to that case.

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