Controlling the various degrees‐of‐freedom (DoFs) of structured light at both quantum and
classical levels is of paramount importance in optics. It is a conventional paradigm to treat …

The transverse spatial effects observed in photon pairs produced by parametric down-
conversion provide a robust and fertile testing ground for studies of quantum mechanics …

Vector vortex beams are structured states of light that are nonseparable in their polarisation
and spatial mode, they are eigenmodes of free-space and many fiber systems, and have the …

Photons can carry angular momentum, not only due to their spin, but also due to their spatial
structure. This extra twist has been used, for example, to drive circular motion of microscopic …

High-dimensional entanglement with spatial modes of light promises increased security and
information capacity over quantum channels. Unfortunately, entanglement decays due to …

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 …

Some 16 years ago, Allen et al.[Phys. Rev. A 45, 8185 (1992)] recognised that laser beams
which carried an angular momentum additional to photon spin, could be realized in the …

One of the greatest challenges in the fields of quantum information processing and quantum
technologies is the detailed coherent control over each and every constituent of quantum …

A few years ago the possibility of coupling and inter-converting the spin and orbital angular
momentum (SAM and OAM) of paraxial light beams in inhomogeneous anisotropic media …

Quantum communication employs the counter-intuitive features of quantum physics for tasks
that are impossible in the classical world. It is crucial for testing the foundations of quantum …