A spaceborne gravity gradiometer concept based on cold atom   interferometers for measuring Earth's gravity field
  We propose a concept for future space gravity missions using cold atom interferometers for measuring the diagonal elements of the gravity gradient tensor and the spacecraft angular velocity. The aim is to achieve better performance than previous space gravity missions due to a very low white noise spectral behavior and a very high common mode rejection, with the ultimate goals of determining the fine structures of the gravity field with higher accuracy than GOCE and detecting time-variable signals in the gravity field better than GRACE. 
Olivier Carraz, Christian Siemes, Luca Massotti, Roger Haagmans,   Pierluigi Silvestrin
physics.atom-ph