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Recent experiments demonstrated the cooling of a microwave mode of ahigh-quality dielectric resonator coupled to optically cooled nitrogen-vacancy(NV) spins in diamond. Our recent theoretical study [arXiv:2110.10950] pointedout the cooled NV spins can be used to realize cavity quantum electrodynamicseffects (C-QED) at room temperature. In this article, we propose to modify thesetup used in a recent diamond maser experiment [Nature 55, 493-496 (2018)],which features a higher spin transition frequency, a lower spin-dephasing rateand a stronger NV spins-resonator coupling, to realize better microwave modecooling and the room-temperature CQED effects. To describe more precisely theoptical spin cooling and the collective spin-resonator coupling, we extend thestandard Jaynes-Cumming model to account for the rich electronic and spinlevels of the NV centers. Our calculations show that for the proposed setup itis possible to cool the microwave mode from $293$ K (room temperature) to $116$K, which is about $72$ K lower than the previous records, and to study theintriguing dynamics of the CQED effects under the weak-to-strong couplingtransition by varying the laser power. With simple modifications, our model canbe applied to, e.g., other solid-state spins or triplet spins of pentacenemolecules, and to investigate other effects, such as the operations of pulsedand continuous-wave masing.

Cavity Quantum Electrodynamics Effects of Optically Cooled Nitrogen-Vacancy Centers Coupled to a High Frequency Microwave Resonator