European QUantum Infrastructure Project for Gravimetry

Imaging the Earth's interior has always been one of the key challenges in geosciences, as it is a prerequisite for understanding our planet's internal dynamics and the coupling between its inner and outer envelopes. Gravity measurements at different altitudes (ground, airborne and space-based observations) provide a unique imaging tool, as they supply direct information on mass changes at different spatio-temporal scales. Following decades of research, developments and industrial transfers, quantum technology has reached a high level of maturity and it is now possible to deliver operational quantum gravimeters offering various advantages with respect to devices that have been hitherto used.

Aligned with the objective of strengthening EU’s strategic autonomy and competitiveness, the Horizon Europe project EQUIP-G [1] started in June 2025. It represents the first step towards establishing the terrestrial segment of the pan-European quantum gravimetry infrastructure, revolving around a shared Instrumental Park and a network of absolute reference stations. For this purpose, quantum gravimeters, dual quantum gravi-gradiometers and an onboard quantum gravimeter are employed. Instruments are comprehensively tested, before being deployed in the field and will demonstrate, through innovative measurement strategies, the ability of the quantum gravity network to contribute to EU priorities, such as green deal, energy management and risk mitigation. Metrological oversight ensures that all collected quantum gravity data will be SI traceable. Data are managed in line with the FAIR principles and with a long-term perspective to establish a TCS for gravimetry within EPOS. EQUIP-G engages in strong community building, aimed at involving the entire European gravimetry community in the development of the long-term Instrumental Park initiative that will extend beyond the end of the project, democratizing the use of quantum gravity devices produced in Europe. This contribution provides an overview of the structure and main objectives of EQUIP-G and presents some preliminary achievements of the project.

EQUIP-G project is funded by the European Commission under the Horizon Europe program, grant number 101215427

[1] https://www.equip-g.eu