Enhanced quantum sensing with room-temperature solid-state masers.

The article reports that quantum sensing with solid-state electron spin systems finds broad applications in diverse areas ranging from material and biomedical sciences to fundamental physics. Topics include examines exploiting collective behavior of noninteracting spins holds the promise of pushing the detection limit to even lower levels, while to date, those levels are scarcely reached because of the broadened line width and inefficient readout of solid-state spin ensembles.