Exail / Muquans
AQG instruments use falling cold atoms to measure local gravitational acceleration. Continuous gravity observations can support geodesy, mass metrology and investigations of changes underground; the output is a gravity measurement rather than a direct image of the subsurface.
France · Research reviewed 7 Sept 2026Latest record: research brief added · axis ratings unchanged.
Review history 2 records
Record dates show when an assessment or clarification was saved. Review dates show the evidence check. Earlier records were recovered from QubitWire’s source history; no earlier score movement is inferred.
Research brief added · axis ratings unchanged
Assessment reviewed 6 Sept 2026 · Research reviewed 7 Sept 2026What changed
- Research brief
- PreviouslyNone recorded
- NowInitial technology, access and evidence brief
Initial assessment recorded
Assessment reviewed 6 Sept 2026Sources in this record (4)
- Quantum gravimeters ↗
- Evaluation of the Exail absolute quantum gravimeters AQG-A02 and AQG-B10 by comparison to a precise gravity reference ↗
- New Quantum Gravimeter Reading Supports Kilogram Realization BIPM ↗
- Three Exail’s Absolute Quantum Gravimeters delivered to Tenerife for Advanced Volcano Monitoring ↗
What it does. Where it fits.
Laser-cooled rubidium atom interferometry for absolute gravity measurement
Who should look closer
Geodesy and geophysics teams evaluating continuous absolute gravity monitoring, and metrology laboratories needing a gravity reference.
QubitWire’s editorial assessment of practical fit.Compare AQG instruments
AQG-A is offered for indoor laboratory use and AQG-B for field measurements. Model datasheets and a quotation route are available from Exail.
Check the current access route ↗What has been demonstrated
BKG evaluated delivered AQG-A02 and AQG-B10 instruments against gravity references and confirmed specified quiet-site sensitivity. Separately, BIPM used an AQG-B01 for a March 2025 gravity measurement supporting its kilogram-realization work.
What remains unresolved
BKG's 2025 evaluation found the two tested units less accurate than FG5-type gravimeters and reported occasional reliability problems. Quiet-site precision must not be confused with overall accuracy.
The next question to watch
Do longer independent deployments demonstrate stable systematic errors and dependable uptime under the environmental conditions required by routine monitoring?
A research question, not a promised milestone.QubitWire coverage
No published QubitWire stories currently match this organization. The evidence sources below provide the starting point.
Sources & evidence
- Quantum gravimeters ↗Organization-originated source · Publication date not stated
Exail offers AQG-A for laboratory work and AQG-B for field gravity measurements, with published precision, stability and repeatability specifications.
- Evaluation of the Exail absolute quantum gravimeters AQG-A02 and AQG-B10 by comparison to a precise gravity reference ↗External source (may be a collaborator) · 4 Sept 2025
BKG tested delivered instruments at gravity reference stations, confirmed specified quiet-site sensitivity, and reported accuracy and reliability limitations alongside operational advantages for continuous measurements.
- New Quantum Gravimeter Reading Supports Kilogram Realization BIPM ↗External source (may be a collaborator) · 2 Apr 2025
An AQG-B01 measured absolute gravity in BIPM's Kibble balance laboratory in March 2025, supporting its kilogram-realization reference.
- Three Exail’s Absolute Quantum Gravimeters delivered to Tenerife for Advanced Volcano Monitoring ↗Organization-originated source · 16 Dec 2025
Exail reported three AQGs delivered to INVOLCAN. Its page documents the first configured installation while describing two further installations as planned; delivery is not proof all three were operational.
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