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Cavity quantum electrodynamics (C-QED) effects, such as Rabi splitting, Rabioscillations and superradiance, have been demonstrated with nitrogen vacancycenter spins in diamond in microwave resonators at cryogenic temperature. Inthis article we explore the possibility to realize strong collective couplingand the resulting C-QED effects with ensembles of spins at room temperature.Thermal excitation of the individual spins by the hot environment leads topopulation of collective Dicke states with low symmetry and a reducedcollective spin-microwave field coupling. However, we show with simulationsthat the thermal excitation can be compensated by spin-cooling via opticalpumping. The resulting population of Dicke states with higher symmetry impliesstrong coupling with currently available high-quality resonators and enablesC-QED effects at room temperature with potential applications in quantumsensing and quantum information processing.

Cavity Quantum Electrodynamics Effects with Nitrogen Vacancy Center Spins in Diamond and Microwave Resonators at Room Temperature