Device-independent quantum key distribution (DI-QKD) provides the gold standard for
secure key exchange. Not only does it allow for information-theoretic security based on …

Quantum physics can be exploited to generate true random numbers, which have important
roles in many applications, especially in cryptography. Genuine randomness from the …

In this Letter, we present a cosmic Bell experiment with polarization-entangled photons, in
which measurement settings were determined based on real-time measurements of the …

A Bell test is a randomized trial that compares experimental observations against the
philosophical worldview of local realism, in which the properties of the physical world are …

A Bell test is a randomized trial that compares experimental observations against the
philosophical worldview of local realism. A Bell test requires spatially distributed …

In a Bell experiment, it is natural to seek a causal account of correlations wherein only a
common cause acts on the outcomes. For this causal structure, Bell inequality violations can …

Nonlocality was discovered by John Bell in 1964, in the context of the debates about
quantum theory, but is a phenomenon that can be studied in its own right. Its observation …

Bell's theorem states that some predictions of quantum mechanics cannot be reproduced by
a local-realist theory. That conflict is expressed by Bell's inequality, which is usually derived …

It is well known that correlations predicted by quantum mechanics cannot be explained by
any classical (local-realistic) theory. The relative strength of quantum and classical …

Classical physics is generally regarded as deterministic, as opposed to quantum mechanics
that is considered the first theory to have introduced genuine indeterminism into physics. We …