Atom-mediated Nonlinear Sources of Quantum Light

Sources of highly nonclassical light are important building blocks of many proposed implementations of optical quantum technologies [1]. The most common realisations of nonclassical light sources are either based on two-level quantum emitters or on nonlinear sources of photon pairs and squeezed light [2] and are generally limited in the properties of the quantum states of light they can efficiently generate: single-photon states for two-level systems and squeezed states (with a Gaussian Wigner function) for nonlinear sources.