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 …

In 1960, the mathematician Ernst Specker described a simple example of nonclassical
correlations, the counter-intuitive features of which he dramatized using a parable about a …

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 …

The concept of 'steering'was introduced in 1935 by Schrödinger as a generalization of the
EPR (Einstein–Podolsky–Rosen) paradox. It has recently been formalized as a quantum …

Quantum superposition of high-dimensional states enables both computational speed-up
and security in cryptographic protocols. However, the exponential complexity of tomographic …

The question of whether quantum phenomena can be explained by classical models with
hidden variables is the subject of a long-lasting debate,. In 1964, Bell showed that certain …

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 …

Interference phenomena are often claimed to resist classical explanation. However, such
claims are undermined by the fact that the specific aspects of the phenomenology upon …

Quantum interference phenomena are widely viewed as posing a challenge to the classical
worldview. Feynman even went so far as to proclaim that they are the $\textit {only mystery} …

A well-motivated method for demonstrating that an experiment resists any classical
explanation is to show that its statistics violate generalized noncontextuality. We here …