Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 37: Precision Measurements and Metrology II
Q 37.8: Talk
Wednesday, March 13, 2019, 15:45–16:00, S SR 111 Maschb.
Gravity gradient cancellation in satellite quantum tests of the Equivalence Principle — •Sina Loriani1, Wolfgang Ertmer1, Franck Pereira Dos Santos2, Dennis Schlippert1, Christian Schubert1, Peter Wolf2, Ernst Maria Rasel1, and Naceur Gaaloul1 — 1Leibniz Universität Hannover, Institute of Quantum Optics, Germany — 2LNE-SYRTE, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, France
Recent tests of the Einstein Equivalence Principle based on the simultaneous operation of two atomic gravimeters have become a promising tool to compare the differential free fall acceleration of a large variety of test masses for diverse violation scenarios. However, the uncertainty in the initial co-location of the two atomic sources couples into the measurement in the presence of gravity gradients and rotations, displaying one major systematic uncertainty.
In this work, we present a combined strategy of gravity gradient compensation and signal demodulation, which allows to reduce the systematic contributions due to the initial co-location below the 10−18 level. Operating on a satellite in inertial configuration leads to temporally modulated gravity gradients in the local frame of the satellite, which requires an extension of the technique presented in [Roura, Phys. Rev. Lett 118, 160401 (2017)] . We analyse the feasibility of this scheme and find that for moderate requirements, the mission duration dominated by verification measurements of the initial co-location can be reduced drastically. Moreover, it allows to integrate the induced differential acceleration uncertainty below 10−18 faster than shot-noise.