Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 15: Poster I

A 15.13: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent A

Measuring the environment of a Cs qubit with dynamical decoupling sequences — •Sabrina Burgardt, Simon Jäger, Julian Feß, Silvia Hiebel, Imke Schneider, and Artur Widera — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern-Landau, Kaiserslautern 67663, Germany

We report the experimental implementation of dynamical decoupling (DD) on a small, non-interacting ensemble of optically trapped, neutral Cs atoms. We observe a significant enhancement of the coherence time when employing Carr-Purcell-Meiboom Gill (CPMG) DD. A CPMG sequence with ten refocusing pulses increases the coherence time by more than one order of magnitude. In addition, we make use of the filter function formalism and utilize the CPMG sequence to measure the background noise floor affecting the qubit coherence. Our findings point toward noise spectroscopy of engineered atomic baths through single-atom DD in a system of individual Cs impurities immersed in an ultracold Rb-87 bath.

Keywords: single impurities; dynamical decoupling; noise spectroscopy