New Quantum Gravimeter Reading Supports Kilogram Realization BIPM
UPDATE: Quantum gravimetry at the BIPM
In March 2025, a new absolute gravity measurement was carried out using an AQG-B01 quantum gravimeter in the Kibble balance laboratory at the BIPM. The result confirms the gravity value currently used in kilogram realization work and strengthens the gravimetry link with the LNE gravity reference station in Trappes—reinforcing the BIPM’s site as a stable and reliable reference location.
This updated value will contribute to the laboratory’s result in the ongoing CCM.M-K8.2024 key comparison of kilogram realizations, coordinated by the BIPM.
The measurement was conducted in partnership with LNE-OP and PGravi in partnership with Action Spécifique Gravimétrie Epos-France, as part of a continuing effort to maintain a precisely characterized reference environment for high-accuracy mass metrology.
Image description: The absolute quantum gravimeter (AQG-B01) measuring gravitational acceleration in the Kibble balance laboratory at the BIPM.
Background
Since the early 2000s, the BIPM has carried out a long-term programme of absolute gravity measurements to support traceability and consistency at the site. Originally through international comparisons (ICAG), and more recently through collaborations with institutes such as METAS, LNE-OP and PGravi, this work ensures that the gravity value used in kilogram realization remains stable and globally comparable.