Multiphoton interference reveals strictly nonclassical phenomena. Its applications range
from fundamental tests of quantum mechanics to photonic quantum information processing …

We demonstrate a wavelength-tunable, fiber-coupled source of polarization-entangled
photons with extremely high spectral brightness and quality of entanglement. Using a 25 mm …

Even though the Madelung equations are central to many'classical'approaches to the
foundations of quantum mechanics such as Bohmian and stochastic mechanics, no …

I consider the extent to which the applicability of the concept of classical realism is
constrained, irrespective of the validity or not of the quantum formalism, by existing …

Recently, secure quantum key distribution based on Deutsch's algorithm using the Bell state
is reported (Nagata and Nakamura, Int. J. Theor. Phys. doi: 10.1007/s10773-017-3352-4 …

From its seemingly non-intuitive and puzzling nature, most evident in numerous EPR-like
gedanken experiments to its almost ubiquitous presence in quantum technologies …

Bell's theorem guarantees that no model based on local variables can reproduce quantum
correlations. Also, some models based on nonlocal variables, if subject to apparently …

Quantum theory predicts and experiments confirm that nature can produce correlations
between distant events that are non-local in the sense of violating a Bell inequality …

Explaining observations in terms of causes and effects is central to empirical science.
However, correlations between entangled quantum particles seem to defy such an …

We show that failure of local realism can be revealed to observers for whom only extremely-
coarse-grained measurements are available. In our instances, Bell's inequality is violated …