  We utilise a magneto-mechanical levitated massive resonator in the quantum
regime to prepare highly macroscopic quantum superposition states. Using these
macroscopic superpositions we present a novel interferometry protocol to
perform absolute gravimetry with a sensitivity that exceeds state of the art
atom-interferometric and corner-cube gravimeters by a factor of 20. In
addition, our scheme allows probing the gravitational field on a length scale
eight orders of magnitude smaller than other methods.
