A central result in the foundations of quantum mechanics is the Kochen-Specker theorem. In
short, it states that quantum mechanics is in conflict with classical models in which the result …

We use the mathematical language of sheaf theory to give a unified treatment of non-locality
and contextuality, in a setting that generalizes the familiar probability tables used in non …

Correlations in Bell and noncontextuality inequalities can be expressed as a positive linear
combination of probabilities of events. Exclusive events can be represented as adjacent …

This review is about single‐particle entanglement. Entanglement occurs when the state of a
quantum system with at least two degrees of freedom has a particular non‐separable form …

In contrast to classical physics, quantum theory demands that not all properties can be
simultaneously well defined; the Heisenberg uncertainty principle is a manifestation of this …

By weakly measuring the polarization of a photon between two strong polarization
measurements, we experimentally investigate the correlation between the appearance of …

This article presents a general discussion of several aspects of our present understanding of
quantum mechanics. The emphasis is put on the very special correlations that this theory …

This progress report covers recent developments in the area of quantum randomness, which
is an extraordinarily interdisciplinary area that belongs not only to physics, but also to …

In quantum mechanics, measurements cause wavefunction collapse that yields precise
outcomes, whereas for non-commuting observables such as position and momentum …

Quantum contextuality, as proved by Kochen and Specker, and also by Bell, should manifest
itself in any state in any system with more than two distinguishable states and recently has …