Nanoscale continuous quantum light sources based on driven dipole emitter arrays

Regular arrays of two-level emitters at distances smaller that the transition wavelength collectively scatter, absorb and emit photons. The strong inter-particle dipole coupling creates large energy shifts collective delocalized excitations, which generates a highly nonlinear response single few photon level. This should allow to implement nanoscale non-classical light sources via weak coherent illumination. At generic tailored examples regular chains or polygons we show fields emitted perpendicular illumination direction exhibit directional confinement with genuine quantum properties as antibunching. For short interparticle superradiant emission can enhance radiated intensity by an order magnitude compared atom focused strongly confined solid angle but still keeping anti-bunching parameter level $g^{(2)}(0) \approx 10^{-2}$.