Local realism is the worldview in which physical properties of objects exist independently of
measurement and where physical influences cannot travel faster than the speed of light …

We present a loophole-free violation of local realism using entangled photon pairs. We
ensure that all relevant events in our Bell test are spacelike separated by placing the parties …

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 …

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 …

The recently reported violation of a Bell inequality using entangled electronic spins in
diamonds (Hensen et al., Nature 526, 682–686) provided the first loophole-free evidence …

When should a given operational phenomenology be deemed to admit of a classical
explanation? When it can be realized in a generalized-noncontextual ontological model …

I take non-locality to be the Michelson–Morley experiment of the early 21st century, assume
its universal validity, and try to derive its consequences. Spacetime, with its locality, cannot …

Quantum mechanics is commonly formulated in a complex, rather than real, Hilbert space.
However, whether quantum theory really needs the participation of complex numbers has …

Measurements performed on distant parts of an entangled quantum state can generate
correlations incompatible with classical theories respecting the assumption of local …