Quantum theory has been successfully validated in numerous laboratory experiments. But
would such a theory, which effectively describes the behavior of microscopic physical …

Entanglement is a quintessential quantum mechanical phenomenon with no classical
equivalent. First discussed by Einstein, Podolsky, and Rosen and formally introduced by …

Superposition, entanglement and non-locality constitute fundamental features of quantum
physics. The fact that quantum physics does not follow the principle of local causality,–can …

Entangled-photon sources with simultaneously near-unity heralding efficiency and
indistinguishability are the fundamental elements for scalable photonic quantum …

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 …

Top quarks represent unique high-energy systems since their spin correlations can be
measured, thus allowing to study fundamental aspects of quantum mechanics with qubits at …

Quantum mechanics has irked physicists ever since its conception more than 100 years ago.
While some of the misgivings, such as it being unintuitive, are merely aesthetic, quantum …

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 …

Quantum nonlocality is usually associated with entangled states by their violations of Bell-
type inequalities. However, even unentangled systems, whose parts may have been …