General Probabilistic Theories with a Gleason-type Theorem
Quantum Physics
2021-12-01 v4
Abstract
Gleason-type theorems for quantum theory allow one to recover the quantum state space by assuming that (i) states consistently assign probabilities to measurement outcomes and that (ii) there is a unique state for every such assignment. We identify the class of general probabilistic theories which also admit Gleason-type theorems. It contains theories satisfying the no-restriction hypothesis as well as others which can simulate such an unrestricted theory arbitrarily well when allowing for post-selection on measurement outcomes. Our result also implies that the standard no-restriction hypothesis applied to effects is not equivalent to the dual no-restriction hypothesis applied to states which is found to be less restrictive.
Cite
@article{arxiv.2005.14166,
title = {General Probabilistic Theories with a Gleason-type Theorem},
author = {Victoria J Wright and Stefan Weigert},
journal= {arXiv preprint arXiv:2005.14166},
year = {2021}
}