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Atom Interferometry for inertial sensors: fundamental and practical sensitivity limits

Arnaud Landragin, Indranil Dutta, Pierre Gillot, Ralf Kohlhaas, Jean Lautier, Matthieu Meunier, Denis Savoie, Bing Cheng, Bess Fang, Carlos L. Garrido Alzar, Rémi Geiger, Sébastien Merlet, Franck Pereira dos Santos

Published Aug 24, 2015• 0 citations
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Developments in atom interferometry have led to atomic inertial sensors with extremely high sensitivity. Their performances are for the moment limited by the ground vibrations, the impact of which is exacerbated by the sequential operation, resulting in aliasing and dead time. We discuss several experiments performed at LNE-SYRTE in order to reduce these problems and achieve the intrinsic limit of atomic inertial sensors. These techniques have resulted in transportable and high-performance instruments that participate in gravity measurements, and pave the way to applications in inertial navigation.
Inertial sensors based on cold atom interferometry are characterized by extremely high sensitivity and stability. They are therefore compatible with the stringent requirements of applications ranging from geophysics, navigation, positioning, and civil engineering to fundamental physics tests. However, the practical use of these sensors remains essentially limited by their relative bulkiness and low measurement bandwidth. Here, we address these drawbacks by implementing a novel solution for atomic state detection. It is based on the modification of the radiation resistance of an antenna in the presence of a cold atom ensemble. This method allowed us the nondestructive monitoring of a coherent quantum dynamics with a bandwidth of about 30 kHz and a chosen destructiveness of less than 0.1%. In addition, by performing a typical Ramsey sequence (a clock measurement), we demonstrate the preservation of the atomic quantum coherence.