Quantum structured light in high dimensions

Structured light has become topical of late, where controlling in all its degrees freedom offered novel states long predicted, enhanced functionality applications, and a modern toolbox for probing fundamental science. Structuring as single photons entangled allows the spatial modes to be used encode large alphabet, accessing high dimensional Hilbert spaces tests quantum mechanics improved information processing tasks. In this tutorial, we outline basic concepts expressed basis (structured light) explain how create, control, detect such laboratory with focus on transverse orbital angular momentum pixel (position) modes. Finally, highlight some example applications structured light, from communications imaging.