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COMPANY RESEARCH · Sensing & timing

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.

Official website ↗
France · Research reviewed 7 Sept 2026

Latest record: research brief added · axis ratings unchanged.

Review history 2 records

Record dates use UTC and 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.

  1. Research brief added · axis ratings unchanged

    Assessment reviewed 6 Sept 2026 · Research reviewed 7 Sept 2026

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    What changed
    Research brief
    Previously

    None recorded

    Now

    Initial technology, access and evidence brief

    Sources in this record (4)
Identity & attribution
Organization record
Exail / Muquans (organization-123)
Recorded role
Absolute quantum gravimetry for geodesy and volcano monitoring
Recorded aliases
No aliases recorded in this assessment.
Name and period
No dated name or ownership transition is recorded here. An alias is a search aid, not evidence of a legal ownership relationship.
Product scope
Laser-cooled rubidium atom interferometry for absolute gravity measurement

A company profile may discuss several systems. Capabilities remain attached to the product and conditions named in each source; they do not transfer automatically to related organizations. A verified security relationship has not been attached to this record.

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TECHNOLOGY & ACCESS

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 ↗
DOCUMENTED EVIDENCE

What the sources establish

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.

link.springer.com ↗bipm.org ↗

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.

Open research questions

Editorial questions for this profile. No reviewed closure decision has been recorded; unanswered questions do not lower the official score.

Open research question

Do longer independent deployments demonstrate stable systematic errors and dependable uptime under the environmental conditions required by routine monitoring?

What evidence would help

A source addressing this question must identify the named system, experiment or deployment, its conditions, measured outcome and remaining limitations. Was the instrument evaluated outside the supplier’s laboratory?

What would resolve it?

An editorial review must explain which part of this question the evidence resolves. A roadmap or an announcement alone does not close it.

No resolved, partial or disputed outcome is asserted without a reviewed transition and its evidence.

Suggest evidence
Open research question

Which named system or service can I use under the documented access route?

What evidence would help

Check the current terms for compare aqg instruments. Identify the system version, eligibility, restrictions and whether the result used hardware or simulation.

What would resolve it?

Current primary documentation must identify the offering, eligible user and access conditions. An unspecified company-level access claim is insufficient.

No resolved, partial or disputed outcome is asserted without a reviewed transition and its evidence.

Suggest evidence
Open research question

What shielding, temperature control and calibration are required?

What evidence would help

Provide the source location, relevant product or generation, workload, resource constraints and reported uncertainty. Keep measurements, simulations and announced targets distinct.

What would resolve it?

A source reviewer must map the evidence to this exact scope. Missing disclosure remains unknown; it is not technical failure.

No resolved, partial or disputed outcome is asserted without a reviewed transition and its evidence.

Suggest evidence

Questions are drawn from the existing brief and sector reading guide. Research brief reviewed 7 Sept 2026. Following stores a local bookmark; it does not send email alerts or imply a scheduled review.

Since your review

Scope: Exail / Muquans. Reading a page never marks its records reviewed.

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From claim to assessment

These are the existing assessment claims and their recorded criterion links. A source link is not an independent replication. New research does not change these published ratings automatically.

Source references in method 1.0 · assessment reviewed 6 Sept 2026
Recorded claim & sourceAssessment linkageProvenance & limits
Source 1

Exail offers AQG-A for laboratory work and AQG-B for field gravity measurements, with published precision, stability and repeatability specifications.

Quantum gravimeters ↗Published Not recorded
Exact source location

No page, figure or section locator is recorded. Open the source and check the claim in its original context.

Capability

Independent comparisons characterize the tested AQG units and disclose accuracy and reliability limitations.

Delivery

Specified commercial instruments have documented deliveries and operating resources.

Published rating inputs remain unchanged.		Organization-originated source

Source type: technical. Independent replication, experiment date and source-version fingerprint are not separately recorded.

Product and measurement scope: read the named system and conditions in this claim. No normalized product revision is assigned.

Review recorded 6 Sept 2026. Research brief reviewed 7 Sept 2026. These dates do not establish publication or experiment dates.

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Source 2

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.

Evaluation of the Exail absolute quantum gravimeters AQG-A02 and AQG-B10 by comparison to a precise gravity reference ↗Published 4 Sept 2025
Exact source location

No page, figure or section locator is recorded. Open the source and check the claim in its original context.

Capability

Independent comparisons characterize the tested AQG units and disclose accuracy and reliability limitations.

Use in practice

Independent geodetic evaluation and metrology use provide repeated instrument use with reported outcomes.

Integration

The instruments have been incorporated into geodetic reference and mass-metrology workflows.

Published rating inputs remain unchanged.		External source; collaborators may be involved

Source type: paper. Independent replication, experiment date and source-version fingerprint are not separately recorded.

Product and measurement scope: read the named system and conditions in this claim. No normalized product revision is assigned.

Review recorded 6 Sept 2026. Research brief reviewed 7 Sept 2026. These dates do not establish publication or experiment dates.

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Source 3

An AQG-B01 measured absolute gravity in BIPM's Kibble balance laboratory in March 2025, supporting its kilogram-realization reference.

New Quantum Gravimeter Reading Supports Kilogram Realization BIPM ↗Published 2 Apr 2025
Exact source location

No page, figure or section locator is recorded. Open the source and check the claim in its original context.

Use in practice

Independent geodetic evaluation and metrology use provide repeated instrument use with reported outcomes.

Integration

The instruments have been incorporated into geodetic reference and mass-metrology workflows.

Published rating inputs remain unchanged.		External source; collaborators may be involved

Source type: customer. Independent replication, experiment date and source-version fingerprint are not separately recorded.

Product and measurement scope: read the named system and conditions in this claim. No normalized product revision is assigned.

Review recorded 6 Sept 2026. Research brief reviewed 7 Sept 2026. These dates do not establish publication or experiment dates.

Report an issue with this claim →
Source 4

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.

Three Exail’s Absolute Quantum Gravimeters delivered to Tenerife for Advanced Volcano Monitoring ↗Published 16 Dec 2025
Exact source location

No page, figure or section locator is recorded. Open the source and check the claim in its original context.

Delivery

Specified commercial instruments have documented deliveries and operating resources.

Published rating inputs remain unchanged.		Organization-originated source

Source type: official. Independent replication, experiment date and source-version fingerprint are not separately recorded.

Product and measurement scope: read the named system and conditions in this claim. No normalized product revision is assigned.

Review recorded 6 Sept 2026. Research brief reviewed 7 Sept 2026. These dates do not establish publication or experiment dates.

Report an issue with this claim →
Revision and evidence-family boundaries

Record reference: ab03a87c7d507c1bb1ab85e10c6eb3d806be83bb491bea3c48b5b4ff8504a759. Read prior recorded revisions.

Repeated coverage can describe the same experiment. The assessment does not contain a reviewed claim-family grouping, so the number of links is never shown as a replication count. Source pages can change independently of this saved assessment; the original source text is not archived here.

CHECK THE ORIGINALS

Sources & evidence

  1. 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.

  2. 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.

  3. 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.

  4. 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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