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

Traditionally, quantum theory assumes the existence of a fixed background causal structure.
But if the laws of quantum mechanics are applied to the causal relations, then one could …

The Hermiticity condition in quantum mechanics required for the characterization of (a)
physical observables and (b) generators of unitary motions can be relaxed into a wider class …

Recently, table-top experiments involving massive quantum systems have been proposed to
test the interface of quantum theory and gravity. In particular, the crucial point of the debate …

In this paper, I attempt a personal account of my understanding of the measurement problem
in quantum mechanics, which has been largely in the tradition of the Copenhagen …

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 foundations of Quantum Mechanics are experiencing a golden age. In a timespan of
less than two decades, an astonishing number of new results, ideas, and frameworks have …

The formalism of generalized probabilistic theories (GPTs) was originally developed as a
way to characterize the landscape of conceivable physical theories. Thus, the GPT …

We reconstruct the explicit formalism of qubit quantum theory from elementary rules on an
observer's information acquisition. Our approach is purely operational: we consider an …

These lecture notes provide a basic introduction to the framework of generalized
probabilistic theories (GPTs) and a sketch of a reconstruction of quantum theory (QT) from …