We introduce the framework of general probabilistic theories (GPTs for short). GPTs are a
class of operational theories that generalize both finite-dimensional classical and quantum …

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 …

We present a new characterization of quantum theory in terms of simple physical principles
that is different from previous ones in two important respects: first, it only refers to properties …

We show that the quantum bound for temporal correlations in a Leggett-Garg test,
analogous to the Tsirelson bound for spatial correlations in a Bell test, strongly depends on …

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

These lecture notes provide a basic introduction to the framework of generalized
probabilistic theories (GPTs) and a sketch of a reconstruction of quantum theory (QT) from …

Many experiments in the field of quantum foundations seek to adjudicate between quantum
theory and speculative alternatives to it. This requires one to analyze the experimental data …

Macroscopic realism (MR) is the notion that a time-evolving system possesses definite
properties, irrespective of past or future measurements. Quantum-mechanical theories can …

Macrorealism (MR) is the worldview that certain quantities may take definite values at all
times irrespective of past or future measurements and may be experimentally falsified via the …

Quantum theory permits interference between indistinguishable paths but, at the same time,
restricts its order. Single-particle interference, for instance, is limited to the second order, that …