Recently, table-top experiments involving massive quantum systems have been proposed to
test the interface of quantum theory and gravity. In particular, the crucial point of the debate …

The formalism of generalized probabilistic theories (GPTs) was originally developed as a
way to characterize the landscape of conceivable physical theories. Thus, the GPT …

A reconstruction of quantum theory refers to both a mathematical and a conceptual
paradigm that allows one to derive the usual formulation of quantum theory from a set of …

Quantum theory may be formulated using Hilbert spaces over any of the three associative
normed division algebras: the real numbers, the complex numbers and the quaternions …

We consider possible non-signaling composites of probabilistic models based on euclidean
Jordan algebras (EJAs), satisfying some reasonable additional constraints motivated by the …

In any probabilistic theory, we say that a bipartite state ω on a composite system AB steers
its marginal state ω B if, for any decomposition of ω B as a mixture ω B=∑ ipi β i of states β i …

We discuss a novel framework for physical theories that is based on the principles of locality
and operationalism. It generalizes and unifies previous frameworks, including the standard …

This chapter offers a brief introduction to what is often called the convex-operational
approach to the foundations of quantum mechanics, and reviews selected results, mostly by …

Using a result of H. Hanche-Olsen, we show that (subject to fairly natural constraints on what
constitutes a system, and on what constitutes a composite system), orthodox finite …

We study the origin of quantum probabilities as arising from non-Boolean propositional-
operational structures. We apply the method developed by Cox to non distributive lattices …