Title: A hybrid source of quantum light for generation of frequency tunable Fock states

Abstract: We propose a scheme for quantum-light generation in a nonlinear cavity hybridized with a 2-level system. We theoretically show that, when excited by a series of controlled pump pulses, the hybrid source can generate various Fock states with high probabilities, such as near-on-demand generation of 1- and 2-photon states, and above 50% probability for generation of Fock states with up to 7 photons. More importantly, the tailorable nature of the nonlinear cavity and its pumping allows for generating Fock states with arbitrary frequencies, even with a fixed 2-level system, creating fundamentally new opportunities in all areas of quantum technologies.