We consider the use of quantum-limited mechanical force sensors to detect ultralight (sub-meV) dark matter candidates which are weakly coupled to the standard model. We emphasize the scalable nature of an array of sensors, which can be used to reject many backgrounds, and leads to sensitivities scaling at least as fast as Ndet−−−−√. We show that for some ultralight dark matter candidates, a pair of milligram-scale, mechanical sensors operating at the standard quantum limit already has detection reach competitive with other quantum acceleration sensors.

1 aCarney, Daniel1 aHook, Anson1 aLiu, Zhen1 aTaylor, Jacob, M.1 aZhao, Yue uhttps://arxiv.org/abs/1908.04797