A scalable high-performance magnetic shield for very long baseline atom interferometry

Wodey, Étienne; Tell, Dorothee; Rasel, Ernst M.; Schlippert, Dennis; Baur, R.; Kissling, U.; Kölliker, B.; Lorenz, M.; Marrer, M.; Schläpfer, U.; Widmer, Marino; Ufrecht, Christian; Stuiber, S.; Fierlinger, P.

doi:10.1063/1.5141340

Cited by 31 publications

(20 citation statements)

References 23 publications

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“…Advanced cooling techniques such as evaporation in an optical dipole trap [68] are expected to enhance the contrast [69,70] and will allow us to reduce wave front-related errors by achieving colder temperatures and by tuning the differential expansion of the two species. The homogeneity of the magnetic field can be improved by an upgrade of the magnetic shield [71], a more in-depth characterization, and advanced center-of-mass control over the ensembles. By relying on the differential suppression of vibration noise between the two elements [57] we envisage the perspective for a test on the level of 10 −9 .…”

Section: Discussionmentioning

confidence: 99%

Quantum test of the Universality of Free Fall using rubidium and potassium

et al. 2020

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We report on an improved test of the Universality of Free Fall using a rubidium-potassium dual-species matter wave interferometer. We describe our apparatus and detail challenges and solutions relevant when operating a potassium interferometer, as well as systematic effects affecting our measurement. Our determination of the Eötvös ratio yields ηRb,K = −1.9 × 10−7 with a combined standard uncertainty of ση = 3.2 × 10−7. Graphical abstract

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Section: Discussionmentioning

confidence: 99%

Quantum test of the Universality of Free Fall using rubidium and potassium

et al. 2020

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“…eff as shown in Equation ( 5), largely cancel in Equation ( 8) . Other systematic effects that act differently on both species and hence do not cancel in the differential phase shift need to be well controlled such as magnetic field gradients (second-order Zeeman effect [144]) and temperature gradients in the setup (black-body radiation [145,146]). The most precise test performed so far with atom interferometry [143] is currently limited by two systematic effects.…”

Section: Tests Of the Weak Equivalence Principlementioning

confidence: 99%

Bose-Einstein condensates in microgravity and fundamental tests of gravity

Ufrecht,

Roura,

Schleich

2021

Preprint

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Light-pulse atom interferometers are highly sensitive to inertial and gravitational effects. As such they are promising candidates for tests of gravitational physics. In this article the state-of-the-art and proposals for fundamental tests of gravity are reviewed. They include the measurement of the gravitational constant G, tests of the weak equivalence principle, direct searches of dark energy and gravitational-wave detection. Particular emphasis is put on long-time interferometry in microgravity environments accompanied by an enormous increase of sensitivity. In addition, advantages as well as disadvantages of Bose-Einstein condensates as atom sources are discussed.

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“…4, 5 and 6; 3. The 10.5-m-long baseline consists of a 20-cm-diameter cylindrical aluminium vacuum chamber and a highperformance magnetic shield (Wodey et al 2020). The interferometric sequences take place along this baseline, In order to decouple the instrument from oscillations of the walls of the building, the apparatus is only rigidly connected to the foundations of the building.…”

Section: The Hannover Vlbai Facilitymentioning

confidence: 99%

“…As a final step, the VLBAI magnetic shield and vacuum system (Wodey et al 2020 installed December 2019) will be added to the model. Similarly to the VSS and VTS, this component was designed using CAD, built with known materials, and can be exported into the required format for our model.…”

Section: Combination Of Model and Measurementmentioning

confidence: 99%

Gravity field modelling for the Hannover 10 m atom interferometer

Schilling

Wodey

Timmen

et al. 2020

J Geod

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Absolute gravimeters are used in geodesy, geophysics and physics for a wide spectrum of applications. Stable gravimetric measurements over timescales from several days to decades are required to provide relevant insight into geophysical processes. Users of absolute gravimeters participate in comparisons with a metrological reference in order to monitor the temporal stability of the instruments and determine the bias to that reference. However, since no measurement standard of higher-order accuracy currently exists, users of absolute gravimeters participate in key comparisons led by the International Committee for Weights and Measures. These comparisons provide the reference values of highest accuracy compared to the calibration against a single gravimeter operated at a metrological institute. The construction of stationary, large-scale atom interferometers paves the way for a new measurement standard in absolute gravimetry used as a reference with a potential stability up to $$1\,\hbox {nm}{/}{\hbox {s}^{2}}$$ 1 nm / s 2 at 1 s integration time. At the Leibniz University Hannover, we are currently building such a very long baseline atom interferometer with a 10-m-long interaction zone. The knowledge of local gravity and its gradient along and around the baseline is required to establish the instrument’s uncertainty budget and enable transfers of gravimetric measurements to nearby devices for comparison and calibration purposes. We therefore established a control network for relative gravimeters and repeatedly measured its connections during the construction of the atom interferometer. We additionally developed a 3D model of the host building to investigate the self-attraction effect and studied the impact of mass changes due to groundwater hydrology on the gravity field around the reference instrument. The gravitational effect from the building 3D model is in excellent agreement with the latest gravimetric measurement campaign which opens the possibility to transfer gravity values with an uncertainty below the $${10}\,\hbox {nm}{/}{\hbox {s}^{2}}$$ 10 nm / s 2 level.

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A scalable high-performance magnetic shield for very long baseline atom interferometry

Cited by 31 publications

References 23 publications

Quantum test of the Universality of Free Fall using rubidium and potassium

Quantum test of the Universality of Free Fall using rubidium and potassium

Bose-Einstein condensates in microgravity and fundamental tests of gravity

Gravity field modelling for the Hannover 10 m atom interferometer

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