Evaluation of the AQG-A02 and AQG-B02 absolute quantum gravimeter accuracy

Quantum gravimeters measure absolute gravity by the matter-wave interference of ultracold atoms. This poses a promising new alternative technology to the established falling corner cube gravimeters, such as the FG5/X, which currently provide the reference for absolute terrestrial gravimetry. Due to the lack of mechanical components, quantum gravimeters offer advantages in maintenance and allow for continuous operation over extended time periods. Moreover, the fundamental difference in measurement principle could reveal potentially unknown systematic biases in either system.

The iXblue Absolute Quantum Gravimeter (AQG) is the first commercially available instrument of this kind. As one of the early users, BKG and GFZ are evaluating the AQG-A02 and AQG-B02 for performance and future application in routine operations. In autumn 2021, both instruments have for the first time taken part in a comparison, the international comparison of absolute gravimeters WET-CAG2021 at the Geodetic Observatory Wettzell, Germany. Here we present current results based on these measurements, regarding the AQG’s absolute accuracy. Further, we evaluate signal stability from a long-term measurement over 6 weeks.