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We examine quantum statistics of optical photons emitted from atomicensembles which are classically driven and simultaneously coupled to atwo-level atom via microwave photon exchange. Quantum statistics andcorrelations are analyzed by calculating second order coherence degree, vonNeumann entropy, spin squeezing for multi-particle entanglement, as well asgenuine two and three-mode entanglement parameters for steady state andnon-equilibrium situations. Coherent transfer of population between theradiation modes and quantum state mapping between the two-level atom and theoptical modes are discussed. A potential experimental realization of thetheoretical results in a superconducting coplanar waveguide resonatorcontaining diamond crystals with Nitrogen-Vacancy color centers and asuperconducting artificial two-level atom is discussed.

Quantum Coherence and Correlations of optical radiation by atomic ensembles interacting with a two-level atom in microwave cavity