Pushing the limits of a Differential Quantum Gravimeter

International audienceMeasuring the acceleration of the Earths gravity g and the gravity gradient simultaneously and at the same location promises to provide enhance information about the distribution of underground masses, especially at shallow depths [1]. Quantum sensors relying on Atom Interferometry with laser cooled-atoms [2,3] is a technology of choice to implement such new sensing capability and an industry-grade demonstrator has been recently developed. We present the performance of the device that has been integrated and discuss its stationary measurement capability, with the demonstration of a resolution below 1E for the measurement of the vertical gravity gradient (1E = 10-9 s-2 = 0.1 Gal/m) and 0.5 Gal for the measurement of g. In order to illustrate the potential for mass balance monitoring and gravity survey we will present a proof-of-principle experiment with realistic masses and measurement durations. The compactness of the instrument and the field-tested technology [4] on which it is based allows to consider the deployment of this new sensor in real environment as a future short-term outcome to investigate both spatial and temporal mass balance in the field. Promising case studies will be discussed, as this type of sensor can sense mass changes that are not detected by gravimeters. [1] G. Pajot, O. de Viron, M. M. Diament, M. F. Lequentrec-Lalancette, V. Mikhailov, Geophysics 73, 123 (2008) [2] R.Geiger, A.Landragin, S.Merlet, F. Pereira Dos Santos, AVS QuantumScience 2, 024702(2020) [3] V. Menoret et al., "Gravity measurements below 109 g with a transportable absolute quantum gravimeter", Nature Scientific Reports, vol. 8, 12300 (2018) [4] A.-K. Cooke, C. Champollion, N. Le Moigne, Geoscientific Instrumentation, Methods and Data Systems Discussions 2020, 1 (2020

Pushing the limits of a Differential Quantum Gravimeter

International audienceMeasuring the acceleration of the Earths gravity g and the gravity gradient simultaneously and at the same location promises to provide enhance information about the distribution of underground masses, especially at shallow depths [1]. Quantum sensors relying on Atom Interferometry with laser cooled-atoms [2,3] is a technology of choice to implement such new sensing capability and an industry-grade demonstrator has been recently developed. We present the performance of the device that has been integrated and discuss its stationary measurement capability, with the demonstration of a resolution below 1E for the measurement of the vertical gravity gradient (1E = 10-9 s-2 = 0.1 Gal/m) and 0.5 Gal for the measurement of g. In order to illustrate the potential for mass balance monitoring and gravity survey we will present a proof-of-principle experiment with realistic masses and measurement durations. The compactness of the instrument and the field-tested technology [4] on which it is based allows to consider the deployment of this new sensor in real environment as a future short-term outcome to investigate both spatial and temporal mass balance in the field. Promising case studies will be discussed, as this type of sensor can sense mass changes that are not detected by gravimeters. [1] G. Pajot, O. de Viron, M. M. Diament, M. F. Lequentrec-Lalancette, V. Mikhailov, Geophysics 73, 123 (2008) [2] R.Geiger, A.Landragin, S.Merlet, F. Pereira Dos Santos, AVS QuantumScience 2, 024702(2020) [3] V. Menoret et al., "Gravity measurements below 109 g with a transportable absolute quantum gravimeter", Nature Scientific Reports, vol. 8, 12300 (2018) [4] A.-K. Cooke, C. Champollion, N. Le Moigne, Geoscientific Instrumentation, Methods and Data Systems Discussions 2020, 1 (2020

Gravity measurements below 10-<SUP>9</SUP> g with a transportable absolute quantum gravimeter

International audienceThis paper presents the Absolute Quantum Gravimeter (AQG), atransportable gravity sensor based on light-pulse atom interferometrywith laser-cooled &lt;SUP&gt;87&lt;/SUP&gt;Rb atoms. Several units have beenintegrated so far and we present the detailed analysis of theirperformances. We report on a stability of the measurements of g at alevel below 10-&lt;SUP&gt;9&lt;/SUP&gt; g in various types of environment and on thecapability to sustain month-long drift-free continuous acquisitions. TheAQG is an industry-grade gravity sensor which meets the objective toprovide a device based on atom interferometry with laser-cooled atoms asa mobile and automated turn-key device. It is leaving the laboratory forgeophysical studies in hydrology, geodesy and volcanology. This paperwill also be the occasion to describe in more details the high degree ofmaturity of several key enabling technologies such as intelligentintegrated laser systems that can help Quantum Technologies with coldatoms in Quantum Computing, Quantum Simulation and QuantumCommunication

Gravity measurements below 10-<SUP>9</SUP> g with a transportable absolute quantum gravimeter

International audienceThis paper presents the Absolute Quantum Gravimeter (AQG), atransportable gravity sensor based on light-pulse atom interferometrywith laser-cooled &lt;SUP&gt;87&lt;/SUP&gt;Rb atoms. Several units have beenintegrated so far and we present the detailed analysis of theirperformances. We report on a stability of the measurements of g at alevel below 10-&lt;SUP&gt;9&lt;/SUP&gt; g in various types of environment and on thecapability to sustain month-long drift-free continuous acquisitions. TheAQG is an industry-grade gravity sensor which meets the objective toprovide a device based on atom interferometry with laser-cooled atoms asa mobile and automated turn-key device. It is leaving the laboratory forgeophysical studies in hydrology, geodesy and volcanology. This paperwill also be the occasion to describe in more details the high degree ofmaturity of several key enabling technologies such as intelligentintegrated laser systems that can help Quantum Technologies with coldatoms in Quantum Computing, Quantum Simulation and QuantumCommunication

Gravity measurements below 10-<SUP>9</SUP> g with a transportable absolute quantum gravimeter

International audienceThis paper presents the Absolute Quantum Gravimeter (AQG), atransportable gravity sensor based on light-pulse atom interferometrywith laser-cooled &lt;SUP&gt;87&lt;/SUP&gt;Rb atoms. Several units have beenintegrated so far and we present the detailed analysis of theirperformances. We report on a stability of the measurements of g at alevel below 10-&lt;SUP&gt;9&lt;/SUP&gt; g in various types of environment and on thecapability to sustain month-long drift-free continuous acquisitions. TheAQG is an industry-grade gravity sensor which meets the objective toprovide a device based on atom interferometry with laser-cooled atoms asa mobile and automated turn-key device. It is leaving the laboratory forgeophysical studies in hydrology, geodesy and volcanology. This paperwill also be the occasion to describe in more details the high degree ofmaturity of several key enabling technologies such as intelligentintegrated laser systems that can help Quantum Technologies with coldatoms in Quantum Computing, Quantum Simulation and QuantumCommunication

Evaluating the performances of an operational absolute quantum gravimeter

International audienc

Evaluation of the repeatability and the stability of an operational Absolute Quantum Gravimeter

International audienceThe Absolute Quantum Gravimeter (AQG) is an industry-grade commercial gravimeter measuring g with laser-cooled atoms [1] that has been developed in close collaboration with RESIF (the French Seismologic and Geodetic Network, [2]). This paper offers to review the latest characterizations of the first unit of the AQG, that have been conducted by the scientific teams of both RESIF and Muquans. We will discuss the performances of the AQG in terms of sensitivity, stability and repeatability of the measurements provided by the first unit. In particular, we will report on a sensitivity to gravity better than 1 muGal in various types of environment and on stable month-long continuous measurements. The first unit of the AQG has been transported several times over the past two years and we will particularly focus on the recent studies and comparisons with other gravimeters that were carried at the H Observatory operated in France by Geoscience Montpellier, member of RESIF. This ensemble of results today validates the feasibility to operate a quantum gravimeter as a mobile turn-key device but also the ease of use and the robustness of the AQG. This work paves the way to practical investigation of both spatial and temporal gravity variations at the &micro;Gal level in both laboratory and field conditions [3]. [1] F. Pereira dos Santos, S. Bonvalot, &quot;Cold-atom absolute gravimetry&quot;, Encyclopedia of Geodesy, pp 1-6 (2016) [2] http://www.resif.fr/ [3] M. Van Camp, O. de Viron, A. Watlet, B. Meurers, O. Francis, C. Caudron, &quot;Geophysics from terrestrial time-variable gravity measurements&quot;, Rev. Geophys. (2017

Evaluation of the repeatability and the stability of an operational Absolute Quantum Gravimeter

International audienceThe Absolute Quantum Gravimeter (AQG) is an industry-grade commercial gravimeter measuring g with laser-cooled atoms [1] that has been developed in close collaboration with RESIF (the French Seismologic and Geodetic Network, [2]). This paper offers to review the latest characterizations of the first unit of the AQG, that have been conducted by the scientific teams of both RESIF and Muquans. We will discuss the performances of the AQG in terms of sensitivity, stability and repeatability of the measurements provided by the first unit. In particular, we will report on a sensitivity to gravity better than 1 muGal in various types of environment and on stable month-long continuous measurements. The first unit of the AQG has been transported several times over the past two years and we will particularly focus on the recent studies and comparisons with other gravimeters that were carried at the H Observatory operated in France by Geoscience Montpellier, member of RESIF. This ensemble of results today validates the feasibility to operate a quantum gravimeter as a mobile turn-key device but also the ease of use and the robustness of the AQG. This work paves the way to practical investigation of both spatial and temporal gravity variations at the &micro;Gal level in both laboratory and field conditions [3]. [1] F. Pereira dos Santos, S. Bonvalot, &quot;Cold-atom absolute gravimetry&quot;, Encyclopedia of Geodesy, pp 1-6 (2016) [2] http://www.resif.fr/ [3] M. Van Camp, O. de Viron, A. Watlet, B. Meurers, O. Francis, C. Caudron, &quot;Geophysics from terrestrial time-variable gravity measurements&quot;, Rev. Geophys. (2017

Evaluating and comparing the performances of the first units of Absolute Quantum Gravimeter in the time domain

International audienceWe report on the performances of the first three units of the Absolute Quantum Gravimeter that have been integrated so far and discuss their stationary measurement capability. The Absolute Quantum Gravimeter (AQG) is an industry-grade commercial gravimeter measuring g with laser-cooled atoms [1] that has been developed in close collaboration with RESIF (the French Seismologic and Geodetic Network, [2]). This new type of gravimeter is presently the only technology that allows for continuous drift-free monitoring of gravity over timescales from a few minutes to several months. We will discuss the performances of the AQG in terms of sensitivity, stability and repeatability of the measurements provided by the three units. In particular, we report on a reproducible sensitivity to gravity at a level of 1 μGal in various types of environment. We will also present the status of the development of the field version of the AQG designed to be compatible with field operation. This work demonstrates the feasibility to operate a free-falling atom gravimeter as a transportable turn-key device and paves the way to practical investigation of both spatial and temporal gravity variations at the µGal level in both laboratory and field conditions [3]. [1] V. Ménoret et al., "Gravity measurements below 10^-9 g with a transportable absolute quantum gravimeter", Nature Scientific Reports, vol. 8, 12300 (2018) [2] http://www.resif.fr/ [3] M. Van Camp, O. de Viron, A. Watlet, B. Meurers, O. Francis, C. Caudron, "Geophysics from terrestrial time-variable gravity measurements", Rev. Geophys. (2017)

Evaluating and comparing the performances of the first units of Absolute Quantum Gravimeter in the time domain

International audienceWe report on the performances of the first three units of the Absolute Quantum Gravimeter that have been integrated so far and discuss their stationary measurement capability. The Absolute Quantum Gravimeter (AQG) is an industry-grade commercial gravimeter measuring g with laser-cooled atoms [1] that has been developed in close collaboration with RESIF (the French Seismologic and Geodetic Network, [2]). This new type of gravimeter is presently the only technology that allows for continuous drift-free monitoring of gravity over timescales from a few minutes to several months. We will discuss the performances of the AQG in terms of sensitivity, stability and repeatability of the measurements provided by the three units. In particular, we report on a reproducible sensitivity to gravity at a level of 1 μGal in various types of environment. We will also present the status of the development of the field version of the AQG designed to be compatible with field operation. This work demonstrates the feasibility to operate a free-falling atom gravimeter as a transportable turn-key device and paves the way to practical investigation of both spatial and temporal gravity variations at the µGal level in both laboratory and field conditions [3]. [1] V. Ménoret et al., "Gravity measurements below 10^-9 g with a transportable absolute quantum gravimeter", Nature Scientific Reports, vol. 8, 12300 (2018) [2] http://www.resif.fr/ [3] M. Van Camp, O. de Viron, A. Watlet, B. Meurers, O. Francis, C. Caudron, "Geophysics from terrestrial time-variable gravity measurements", Rev. Geophys. (2017)