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 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 …

Our common understanding of the physical world deeply relies on the notion that events are
ordered with respect to some time parameter, with past events serving as causes for future …

The twentieth century saw two fundamental revolutions in physics—relativity and quantum.
Daily use of these theories can numb the sense of wonder at their immense empirical …

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 …

This article summarizes the Quantum Bayesian point of view of quantum mechanics, with
special emphasis on the view's outer edges---dubbed QBism. QBism has its roots in …

Treating reference frames fundamentally as quantum systems is inevitable in quantum
gravity and also in quantum foundations once considering laboratories as physical systems …

Bayesian networks provide a powerful tool for reasoning about probabilistic causation, used
in many areas of science. They are, however, intrinsically classical. In particular, Bayesian …

Quantum theory is not only successfully tested in laboratories every day but also constitutes
a robust theoretical framework: small variations usually lead to implausible consequences …

We present a new characterization of quantum theory in terms of simple physical principles
that is different from previous ones in two important respects: first, it only refers to properties …