Photon-counting readout with high-volume cavities could make DFSZ-sensitivity axion searches possible over 1-30 GHz, provided photon counters achieve wide tuning or very low dark count rates.
A good milestone is the the reduction in the steepness of frequency scaling from V ∼ ν−3 to ν−0.5
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Maximizing Quantum Enhancement in Axion Dark Matter Experiments
Photon-counting readout with high-volume cavities could make DFSZ-sensitivity axion searches possible over 1-30 GHz, provided photon counters achieve wide tuning or very low dark count rates.