Quantum correlations between two parties are essential for the argument of Einstein,
Podolsky, and Rosen in favor of the incompleteness of quantum mechanics. Schrödinger …

Some measurements in quantum mechanics disturb each other. This has puzzled physicists
since the formulation of the theory, but only in recent decades has the incompatibility of …

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 …

We investigate general probabilistic theories in which every mixed state has a purification,
unique up to reversible channels on the purifying system. We show that the purification …

Two central concepts of quantum mechanics are Heisenberg's uncertainty principle and a
subtle form of nonlocality that Einstein famously called “spooky action at a distance.” These …

In the context of a physical theory, two devices, A and B, described by the theory are called
incompatible if the theory does not allow the existence of a third device C that would have …

We investigate the relation between the incompatibility of quantum measurements and
quantum nonlocality. We show that a set of measurements is not jointly measurable (ie …

The fact that not all measurements can be carried out simultaneously is a peculiar feature of
quantum mechanics and is responsible for many key phenomena in the theory, such as …

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 …

Quantum steering refers to the possibility for Alice to remotely steer Bob's state by
performing local measurements on her half of a bipartite system. Two necessary ingredients …