Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 28: Precision Measurements and Metrology: Interferometry II

Q 28.7: Talk

Tuesday, March 7, 2017, 16:00–16:15, P 104

Phase magnification for robust atom interferometry beyond the SQL — •Fabian Anders — Institut für Quantenoptik, LUH Hannover, Deutschland

The two-axis counter-twisting interaction provides the possibility for detection noise robust atom interferometry beyond the standard quantum limit. Our scheme complements recent approaches based on one-axis twisting to magnify the interferometric phase.

In both concepts, the non-linear interaction is not only applied before the interferometer to generate entanglement, but also afterwards to amplify the signal. We compare both squeezing-echo approaches in their optimal performance as well as for experimentally feasible parameters. We find that varying the echo strength can further improve the robustness against detection noise. We obtain simple analytical results for the one-mode approximation of the scheme. Additionally, we investigate spin dynamics in a spinor condensate as suitable interaction to effectively implement this technique.