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 …

We discuss effects of loss of coherence in low energy quantum systems caused by or related
to gravitation, referred to as gravitational decoherence. These effects, resulting from random …

An active area of research in the fields of machine learning and statistics is the development
of causal discovery algorithms, the purpose of which is to infer the causal relations that hold …

The realization of a network of quantum registers is an outstanding challenge in quantum
science and technology. We experimentally investigate a network node that consists of a …

The necessity of quantising the gravitational field is still subject to an open debate. In this
paper we compare the approach of quantum gravity, with that of a fundamentally semi …

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 …

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

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 report on the realization and verification of quantum entanglement between a nitrogen-
vacancy electron spin qubit and a telecom-band photonic qubit. First we generate …

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 …