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 …

We comprehensively review the quantum theory of the polarization properties of light. In
classical optics, these traits are characterized by the Stokes parameters, which can be …

We present a high-dimensional measurement device-independent (MDI) quantum key
distribution (QKD) protocol employing biphotons to encode information. We exploit the …

We present a novel optical device based on an integrated system of microlenses and single-
mode optical fibers. It allows us to collect and direct into many modes two photons …

For two-path interferometers, the which-path predictability and the fringe visibility are familiar
quantities that are much used to talk about wave-particle duality in a quantitative way. We …

Optimal quantum cloning is the process of making one or more copies of an arbitrary
unknown input quantum state with the highest possible fidelity. All reported demonstrations …

High-dimensional quantum states, or qudits, represent a promising resource in the quantum
information field. Here we present the experimental generation of four-dimensional quantum …

We address metrological problems where the parameter of interest is encoded in the
internal degree of freedom of a discrete-time quantum walker, and provide evidence that …

Qudit, a high-dimensional quantum system, can provide a larger Hilbert space, and it has
been shown that the larger Hilbert space has remarkable advantages over the smaller one …

An experimental demonstration of two-qutrit state tomography via one-qutrit symmetric
informationally complete positive operator-valued measure (SIC-POVM) is presented. A two …