Erlangen 2022 – scientific programme
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A: Fachverband Atomphysik
A 13: Precision Measurements and Metrology I (joint session Q/A)
A 13.5: Poster
Tuesday, March 15, 2022, 16:30–18:30, P
Light-pulse atom interferometry with quantized light fields — •Tobias Aßmann1, Fabio Di Pumpo1, Katharina Soukup1, Enno Giese2, and Wolfgang P. Schleich1,3 — 1Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm — 2Institut für Angewandte Physik, Technische Universität Darmstadt — 3Institute of Quantum Technologies, German Aerospace Center (DLR)
The analogues of optical elements in light-pulse atom interferometers are generated from the interaction of matter waves with light, where the latter is usually treated as a classical field. Nonetheless, light fields are inherently quantum, which has fundamental implications for atom interferometry.
In particular, quantized light fields lead to a reduced visibility in the observed interference [J. Chem. Phys. 154, 164310 (2021)]. This loss is a consequence of the encoded which-way information about the atom’s path. However, the quantum nature of the atom-optical elements also offers possibilities to mitigate such effects: We demonstrate that involving superpositions in every light field yields an improved visibility, and an infinitely-strong coherent state recovers full visibility. Moreover, entanglement between all light fields can erase information about the atom’s path and by that partially recovers the visibility.
The QUANTUS project is supported by the German Aerospace Center (DLR) with funds provided by the Federal Ministry of Economics and Technology (BMWi) due to an enactment of the German Bundestag under grant DLR 50WM1956 (QUANTUS V).