Measuring Observable Quantum Contextuality
Quantum Physics
2016-01-21 v6 Probability
Abstract
Contextuality is a central property in comparative analysis of classical, quantum, and supercorrelated systems. We examine and compare two well-motivated approaches to contextuality. One approach ("contextuality-by-default") is based on the idea that one and the same physical property measured under different conditions (contexts) is represented by different random variables. The other approach is based on the idea that while a physical property is represented by a single random variable irrespective of its context, the joint distributions of the random variables describing the system can involve negative (quasi-)probabilities. We show that in the Leggett-Garg and EPR-Bell systems, the two measures essentially coincide.
Cite
@article{arxiv.1406.3088,
title = {Measuring Observable Quantum Contextuality},
author = {J. Acacio de Barros and Ehtibar N. Dzhafarov and Janne V. Kujala and Gary Oas},
journal= {arXiv preprint arXiv:1406.3088},
year = {2016}
}
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12 pages