Abstract
In this paper we review the general framework of operational probabilistic theories (OPT), along with the six axioms from which quantum theory can be derived. We argue that the OPT framework along with a relaxed version of five of the axioms, define a general information theory. We close the paper with considerations about the role of the observer in an OPT, and the interpretation of the von Neumann postulate and the Schrödinger-cat paradox.
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Notes
There is no loss of generality in this assumption, as we can always augment \(\mathsf {St}(\mathrm {A})\) and \(\mathsf {Eff}(\mathrm {A})\) to their convex hulls. However, there are exceptional cases where it may be convenient not to do so, e.g. when one considers deterministic theories, where probabilities are bound to the values 0 and 1.
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Acknowledgments
This work has been supported in part by the Templeton Foundation under the Project ID# 43796 A Quantum-Digital Universe.
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D’Ariano, G.M., Perinotti, P. Quantum Theory is an Information Theory. Found Phys 46, 269–281 (2016). https://doi.org/10.1007/s10701-015-9935-0
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DOI: https://doi.org/10.1007/s10701-015-9935-0