Engineering Non-Classical Light In Photonic Integrated Devices With Linearly Coupled And Uncoupled Resonators

Integrated micro- and nanostructures allow for the efficient generation of photon pairs via parametric fluorescence, thanks to the enhancement of the light-matter interaction associated with light confinement in small volumes. Yet the advantages of using integrated devices go well-beyond the improvement of generation efficiency, for micro-structures can be designed to enable a precise control over the properties of the generated non-classical light. Particularly interesting are structures composed of more than one micro-resonator. In such systems one can control the spectral properties of the generated light, and suppress unwanted phenomena, with a careful engineering of the linear and nonlinear coupling of the resonant elements. Here we show that we can exploit this structure to generate photon pairs that are highly energy entangled or completely uncorrelated.