General conditions for maximal violation of non-contextuality in discrete and continuous variables

The contextuality of quantum mechanics can be shown by the violation of inequalities based on measurements of well chosen observables. An important property of such observables is that their expectation value can be expressed in terms of probabilities for obtaining two exclusive outcomes. Examples o...

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Bibliographic Details
Published in:Journal of physics. A, Mathematical and theoretical Mathematical and theoretical, 2017-04, Vol.50 (15), p.155304
Main Authors: Laversanne-Finot, A, Ketterer, A, Barros, M R, Walborn, S P, Coudreau, T, Keller, A, Milman, P
Format: Article
Language:English
Subjects:
contextuality
fundamental properties
hidden variables
Peres-Mermin
state-independence
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Summary:The contextuality of quantum mechanics can be shown by the violation of inequalities based on measurements of well chosen observables. An important property of such observables is that their expectation value can be expressed in terms of probabilities for obtaining two exclusive outcomes. Examples of such inequalities have been constructed using either observables with a dichotomic spectrum or using periodic functions obtained from displacement operators in phase space. Here we identify the general conditions on the spectral decomposition of observables demonstrating state independent contextuality of quantum mechanics. Our results not only unify existing strategies for maximal violation of state independent non-contextuality inequalities but also lead to new scenarios enabling such violations. Among the consequences of our results is the impossibility of having a state independent maximal violation of non-contextuality in the Peres-Mermin scenario with discrete observables of odd dimensions.
ISSN:1751-8113
1751-8121
DOI:10.1088/1751-8121/aa6016