Entangled photon pairs are a critical resource in quantum communication protocols ranging
from quantum key distribution to teleportation. The current workhorse technique for …

Over the past 30 years, physical optics has been enriched by the appearance of singular
optics as a new branch approved in scientific classifiers. This review briefly outlines the main …

Steering is a form of quantum nonlocality that is intimately related to the famous Einstein-
Podolsky-Rosen (EPR) paradox that ignited the ongoing discussion of quantum correlations …

We present a general class of entanglement criteria for continuous variable systems. Our
criteria are based on the Husimi Q distribution and allow for optimization over the set of all …

We discuss the use of the transverse spatial degrees of freedom of photons propagating in
the paraxial approximation for continuous-variable information processing. Given the wide …

We prove a general class of continuous variable entanglement criteria based on the Husimi
Q distribution, which represents a quantum state in canonical phase space, by employing a …

We examine experimentally how the degree of position-momentum entanglement of photon
pairs depends on the transverse coherence of the pump beam that excites them in a process …

Entangled photons produced by spontaneous parametric down-conversion have been of
paramount importance for our current understanding of quantum mechanics and advances …

We utilise the position and orbital angular momentum (OAM) correlations between the signal
and idler photons generated in the down-conversion process to obtain ghost images of a …

We derive a family of entanglement criteria for continuous-variable systems based on the
Rényi entropy of complementary distributions. We show that these entanglement witnesses …