Quantum discord and noncontextual hidden variables models

Details Quantum discord and noncontextual hidden variables models Quantum discord and noncontextual hidden variables models

2012-01-21

arxiv.org/abs/1201.4421v1

Phys. Rev. A85 (2012) 012114

Physics

Quantum Physics

5 pages (to appear in PRA)

Scientific paper

It is shown that theoretically viable noncontextual hidden variables models in $d=2$ lead to conflicting dispersion free expressions in the analysis of the conditional measurement of two non-orthogonal projectors. No satisfactory criterion of the quantum discord, which relies on the analysis of conditional measurement, is formulated in the $d=2$ hidden variables space due to a lack of uniqueness of the dispersion free representation. We also make a speculative comment on a "many-worlds interpretation" of hidden variables models to account for the conditional measurement.

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