Ultralight dark matter detection with mechanical quantum sensors

Abstract We consider the use of quantum-limited mechanical force sensors to detect ultralight (sub-meV) dark matter (DM) candidates which are weakly coupled standard model. show that with masses around or below milligram scale, operating quantum limit, would enable novel searches for DM natural frequencies kHz scale. This complement existing strategies based on torsion balances, atom interferometers, and atomic clock systems.