Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 30: Ultra-cold atoms, ions, and BEC VII (joint session A/Q)
A 30.5: Vortrag
Freitag, 13. März 2020, 12:15–12:30, f303
Atom number stabilization with single-atom precision — Andreas Hüper1, Cebrail Pür1, •Mareike Hetzel1, Jiao Geng1, Mick Kristensen2, Jan Arlt2, and Carsten Klempt1 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Germany — 2Institut for Fysik og Astronomi, Aarhus Universitet, Denmark
The preparation and evaluation of quantum states for optimal entanglement-enhanced metrology relies on an accurate determination of the number of atoms. We present an accurate fluorescence detection of atoms trapped in a miniature magneto-optical trap. We utilize the accurate atom number detection for a number stabilization of a laser-cooled atomic ensemble. For a target ensemble size of seven atoms prepared on demand, we achieve a 92 % preparation fidelity and reach number fluctuation 18 dB below the shot noise level using real-time feedback on the magneto-optical trap.