One of the best signatures of nonclassicality in a quantum system is the existence of
correlations that have no classical counterpart. Different methods for quantifying the …

Abstract The Free Energy Principle (FEP) states that under suitable conditions of weak
coupling, random dynamical systems with sufficient degrees of freedom will behave so as to …

Although complex numbers are essential in mathematics, they are not needed to describe
physical experiments, as those are expressed in terms of probabilities, hence real numbers …

Written by one of the founding fathers of Quantum Information, this book gives an accessible
(albeit mathematically rigorous), self-contained introduction to quantum information theory …

Quantum theory provides an extremely accurate description of fundamental processes in
physics. It thus seems likely that the theory is applicable beyond the, mostly microscopic …

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 …

Many fields of science investigate states and processes as resources. Chemistry,
thermodynamics, Shannon's theory of communication channels, and the theory of quantum …

Quantum Measurement is a book on the mathematical and conceptual foundations of
quantum mechanics, with a focus on its measurement theory. It has been written primarily for …

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 …

Quantum theory (QT) is usually formulated in terms of abstract mathematical postulates
involving Hilbert spaces, state vectors and unitary operators. In this paper, we show that the …