The influence of transverse motion within an atomic gravimeter

Louchet-Chauvet, Anne; Farah, Tristan; Bodart, Quentin; Clairon, A.; Landragin, Arnaud; Merlet, Sébastien; Santos, Franck Pereira dos

doi:10.1088/1367-2630/13/6/065025

Cited by 230 publications

(289 citation statements)

References 22 publications

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“…The interferometric phase depends on the transverse motion of atoms [56]. The rotations can thus induce a drop of contrast because of the averaging over the spa- tial and the velocity spread distributions of the atomic clouds.…”

Section: Limit -Drop Of Contrast Because Of Inertial Effectsmentioning

confidence: 99%

Characterization of a simultaneous dual-species atom interferometer for a quantum test of the weak equivalence principle

2015

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We present here the performance of a simultaneous dual-species matter-wave accelerometer for measuring the differential acceleration between two different atomic species ( 87 Rb and 85 Rb). We study the expression and the extraction of the differential phase from the interferometer output. The differential accelerometer reaches a short-term sensitivity of 1.23 × 10 −7 g/ √ Hz limited by the detection noise and a resolution of 2 × 10 −9 g after 11000 s, the highest reported thus far with a dual-species atom interferometer to our knowledge. Thanks to the simultaneous measurement, such resolution levels can still be achieved even with vibration levels up to 3 × 10 −3 g, corresponding to a common-mode vibration noise rejection ratio of 94 dB (rejection factor of 50 000). These results prove the ability of such atom sensors for realizing a quantum based test of the weak equivalence principle (WEP) at a level of η ∼ 10 −9 even with high vibration levels and a compact sensor.

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Section: Limit -Drop Of Contrast Because Of Inertial Effectsmentioning

confidence: 99%

Characterization of a simultaneous dual-species atom interferometer for a quantum test of the weak equivalence principle

2015

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“…The displacement is induced by shifting the position of the zero magnetic field of the MOT using additional coils, while keeping the molasses beams well balanced. Two sets of The normalized response function of the detection along the EW direction, displayed at the bottom, is close to a square shape function (see [3] for more details). Left: Case of a cloud well centered with respect to the detection.…”

Section: Response Of the Detectionmentioning

confidence: 79%

“…Calculating the half difference between these two measurements, one gets the shift due to Coriolis acceleration and averaging the two measurements, the interferometer phase is corrected from Coriolis acceleration. We use this last method in [3], as well as during comparison campaigns [6,13,14].…”

Section: Introductionmentioning

confidence: 99%

Effective velocity distribution in an atom gravimeter: Effect of the convolution with the response of the detection

et al. 2014

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We present here a detailed study of the influence of the transverse motion of the atoms in a free-fall gravimeter. By implementing Raman selection in the horizontal directions at the beginning of the atoms free fall, we characterize the effective velocity distribution, ie the velocity distribution of the detected atom, as a function of the laser cooling and trapping parameters. In particular, we show that the response of the detection induces a pronounced asymetry of this effective velocity distribution that depends not only on the imbalance between molasses beams but also on the initial position of the displaced atomic sample. This convolution with the detection has a strong influence on the averaging of the bias due to Coriolis acceleration. The present study allows a fairly good understanding of results previously published in Louchet-Chauvet et al., NJP 13, 065025 (2011), where the mean phase shift due to Coriolis acceleration was found to have a sign different from expected.

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“…Un algorithme utilisant ces quatre mesures successives permettent de mesurer g tout en rejetant la majeure partie des biais systématiques à l'exception du biais lié à l'effet Coriolis et celui lié aux aberrations du front d'onde [47]. Cependant, l'alternance des quatre configurations dégrade la sensibilité d'un facteur √ 10.…”

Section: Performancesunclassified

“…Le bilan d'incertitude est dominé par le biais dû aux aberrations du front d'onde. Comme indiqué dans [47], l'expansion balistique des atomes lors de leur chute est la cause principale de ce biais. Nos études actuelles visent à réduire l'incertitude associée en refroidissant plus encore les atomes, pour réduire cette expansion.…”

Section: Performancesunclassified

Détermination de l’accélération de la pesanteur pour la balance du watt du LNE

Merlet¹,

Gillot²,

Farah³

et al. 2015

R. franç. métrol.

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RésuméLe projet « balance du watt » propose de relier la définition du kilogramme à la constante de Planck. La pesée de la masse impliquée nécessite une détermination de l'accélération de la pesanteur g avec une exactitude meilleure que 10 −8 . Les travaux résumés dans cet article visent à réaliser cette détermination à l'aide d'un gravimètre atomique et d'un site gravimétrique dédié. MOTS CLÉS: GRAVIMÉTRIE, CARTOGRAPHIE GRAVIMÉTRIQUE, MODÉLISATION GRAVIMÉTRIQUE, INTERFÉROMÉTRIE ATOMIQUE, BALANCE DU WATT. AbstractThe "watt balance" project aims at linking the kilogram definition to the Planck constant. The weighing of the mass involved requires a determination of the acceleration g with an uncertainty better than 10 −8 . This work aims at determining g with an atomic gravimeter and a dedicated gravimetric site.

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The influence of transverse motion within an atomic gravimeter

Cited by 230 publications

References 22 publications

Characterization of a simultaneous dual-species atom interferometer for a quantum test of the weak equivalence principle

Characterization of a simultaneous dual-species atom interferometer for a quantum test of the weak equivalence principle

Effective velocity distribution in an atom gravimeter: Effect of the convolution with the response of the detection

Détermination de l’accélération de la pesanteur pour la balance du watt du LNE

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