Since its discovery, quantum entanglement has challenged some of the best established
views of the world: locality and reality. Quantum technologies promise to revolutionize …

Twenty-five years ago Allen, Beijersbergen, Spreeuw, and Woerdman published their
seminal paper establishing that light beams with helical phase-fronts carried an orbital …

" This engagingly written text provides a useful pedagogical introduction to an extensive
class of geometrical phenomena in the optics of polarization and phase, including simple …

Light with spatiotemporal orbital angular momentum (ST-OAM) is a recently discovered type
of structured and localized electromagnetic field. This field carries characteristic space–time …

Optical vortex beams, possessing spatial polarization or phase singularities, have intriguing
properties such as the ability to yield super-resolved spots under focussing, and the ability to …

Quantum entanglement, plays a vital role in many quantum-information and communication
tasks. Entangled states of higher-dimensional systems are of great interest owing to the …

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

The orbital angular momentum of light represents a fundamentally new optical degree of
freedom. Unlike linear momentum, or spin angular momentum, which is associated with the …

Light's orbital angular momentum (OAM) is a conserved quantity in cylindrically symmetric
media. However, it is easily destroyed by free-space turbulence or fiber bends, because …

Quantum mechanics is now a mature topic dating back more than a century. During its
scientific development, it fostered many technological advances that now are integrated into …