Representing probabilistic data via ontological models

Details Representing probabilistic data via ontological models Representing probabilistic data via ontological models

2007-09-07

arxiv.org/abs/0709.1149v2

Physics

Quantum Physics

Replaces previous paper of the same name with substantial new content. New author added and almost all previous open problems

Scientific paper

Ontological models are attempts to quantitatively describe the results of a probabilistic theory, such as Quantum Mechanics, in a framework exhibiting an explicit realism-based underpinning. Unlike either the well known quasi-probability representations, or the "r-p" vector formalism, these models are contextual and by definition only involve positive probability distributions (and indicator functions). In this article we study how the ontological model formalism can be used to describe arbitrary statistics of a system subjected to a finite set of preparations and measurements. We present three models which can describe any such empirical data and then discuss how to turn an indeterministic model into a deterministic one. This raises the issue of how such models manifest contextuality, and we provide an explicit example to demonstrate this. In the second half of the paper we consider the issue of finding ontological models with as few ontic states as possible.

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