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

Quantum Mechanics (QM) is one of the pillars of modern physics: an impressive amount of
experiments have confirmed this theory and many technological applications are based on …

Forming the backbone of quantum technologies today, entanglement, has been
demonstrated in physical systems as diverse as photons, ions and superconducting circuits …

Quantum teleportation—the transmission and reconstruction over arbitrary distances of the
state of a quantum system—is demonstrated experimentally. During teleportation, an initial …

We experimentally entangle freely propagating particles that never physically interacted with
one another or which have never been dynamically coupled by any other means. This …

The superposition principle plays the most central role in all considerations of quantum
information, and in most of the" gedanken" experiments and even the paradoxes of quantum …

We present the experimental observation of polarization entanglement for three spatially
separated photons. Such states of more than two entangled particles, known as …

We study the use of entanglement purification for quantum communication over long
distances. For distances much longer than the coherence length of a corresponding noisy …

Bell's theorem states that certain statistical correlations predicted by quantum physics for
measurements on two-particle systems cannot be understood within a realistic picture based …

A pulsed source of energy-time entangled photon pairs pumped by a standard laser diode is
proposed and demonstrated. The basic states can be distinguished by their time of arrival …