DMRadio-GUT: paths toward the ultimate low frequency dark matter axion experiment  

DMRadio-GUT is the ultimate experiment in the DMRadio series, searching for electromagnetically coupled dark matter axions at DFSZ couplings over 0.4–120 neV /c² (0.1–30 MHz). These axions correspond to symmetry breaking scales at grand-unified-theory energies. The requirements for the experiment to have sensitivity to such weakly coupled axions are ambitious but within reach. In this talk we present a path toward DMRadio-GUT, specifically highlighting recent experimental advances in resonator technology and superconducting devices that operate below the standard quantum limit, namely radiofrequency quantum upconverters. These experimental advances mark significant steps toward realizing the requirements for DMRadio-GUT.