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We show that a magnetically levitated microsphere in high vacuum can be usedas an accelerometer by comparing its response to that of a commerciallyavailable geophone. This system shows great promise for ultrahigh accelerationsensitivities without the need for large masses or cryogenics. With feedbackcooling, the transient decay time is reduced and the center-of-mass motion iscooled to \SI{9}{K} or less. Remarkably, the levitated particle accelerometerhas a sensitivity down to \SI{3.6e-8}{\mathit{g}/\sqrt{Hz}} and givesmeasurements similar to those of the commercial geophone at frequencies up to\SI{14}{Hz} despite a test mass that is four billion times smaller. With nofree parameters in the calibration, the responses of the accelerometers matchwithin \num{3}\% at \SI{5}{Hz}. The system reaches this sensitivity due to arelatively large particle mass of \SI{0.25}{\upmu g}, a low center of massoscillation frequency of \SI{1.75}{Hz}, and a novel image analysis method thatcan measure the displacement with an uncertainty of \SI{1.6}{nm} in a singleimage.

High sensitivity accelerometry with a feedback-cooled magnetically levitated microsphere