SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 12: Poster I
A 12.9: Poster
Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof
Coherent and Dephasing Spectroscopy for Single-Impurity Probing of an Ultracold Bath — •Sabrina Burgardt1, Daniel Adam1, Quentin Bouton2, Jens Nettersheim1, and Artur Widera1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern-Landau, Kaiserslautern 67663, Germany — 2Laboratoire de Physique des Lasers, CNRS, UMR 7538, Universite Sorbonne Paris Nord, F-93430 Villetaneuse, France
We report Ramsey spectroscopy on the clock states of individual Cs impurities immersed in an ultracold Rb bath. We record both the interaction-driven phase evolution and the decay of fringe contrast of the Ramsey interference signal to obtain information about bath density or temperature nondestructively. The Ramsey fringe is modified by a differential shift of the collisional energy when the two Cs states superposed interact with the Rb bath. This differential shift is directly affected by the mean gas density and the details of the Rb-Cs interspecies scattering length, affecting the phase evolution and the contrast of the Ramsey signal. Additionally, we enhance the temperature dependence of the phase shift preparing the system close to a low-magnetic-field Feshbach resonance where the s-wave scattering length is significantly affected by the collisional (kinetic) energy. Analyzing coherent phase evolution and decay of the Ramsey fringe contrast, we probe the Rb clouds density and temperature. Our results point at using individual impurity atoms as nondestructive quantum probes in complex quantum systems.