The maturity of fields such as optical physics and quantum optics has brought with it a new
era where the photon represents a promising information resource. In the past few years …

Gaussian states have played an important role in the physics of continuous-variable
quantum systems. They are appealing for the experimental ease with which they can be …

Randomness is far from a disturbing disorder in nature. Rather, it underlies many processes
and functions. Randomness can be used to improve the efficacy of development and of …

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 …

From dice to modern electronic circuits, there have been many attempts to build better
devices to generate random numbers. Randomness is fundamental to security and …

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 …

Bell's theorem is typically understood as the proof that quantum theory is incompatible with
local-hidden-variable models. More generally, we can see the violation of a Bell inequality …

Quantum networks are the center of many of the recent advances in quantum science, not
only leading to the discovery of new properties in the foundations of quantum theory but also …

Randomness expansion where one generates a longer sequence of random numbers from
a short one is viable in quantum mechanics but not allowed classically. Device-independent …

Bell inequalities rest on three fundamental assumptions: realism, locality, and free choice,
which lead to nontrivial constraints on correlations in very simple experiments. If we retain …