Bell's 1964 theorem, which states that the predictions of quantum theory cannot be
accounted for by any local theory, represents one of the most profound developments in the …

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 …

The idea that events obey a definite causal order is deeply rooted in our understanding of
the world and at the basis of the very notion of time. But where does causal order come from …

From the physical point of view entanglement witnesses (EWs) define a universal tool for
analysis and classification of quantum entangled states. From the mathematical perspective …

Nonlocality is the most characteristic feature of quantum mechanics, but recent research
seems to suggest the possible existence of nonlocal correlations stronger than those …

We take a resource-theoretic approach to the problem of quantifying nonclassicality in Bell
scenarios. The resources are conceptualized as probabilistic processes from the setting …

The framework of generalized probabilistic theories is a powerful tool for studying the
foundations of quantum physics. It provides the basis for a variety of recent findings that …

The discovery of postquantum nonlocality, ie, the existence of nonlocal correlations that are
stronger than any quantum correlations but nevertheless consistent with the no-signaling …

The outcomes of measurements on entangled quantum systems can be nonlocally
correlated. However, while it is easy to write down toy theories allowing arbitrary nonlocal …

It is a fundamental prediction of quantum theory that states of physical systems are
described by complex vectors or density operators on a Hilbert space. However, many …