Hannover 2020 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 28: Poster Session - Atomic Physics IV

A 28.19: Poster

Donnerstag, 12. März 2020, 16:00–18:00, Empore Lichthof

Single-atom-resolved fluorescence detection in a magneto-optical trap — •Cebrail Pür, Mareike Hetzel, Jiao Geng, Andreas Hüper, Wolfgang Ertmer, and Carsten Klempt — Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, D-30167 Hannover, Germany

Atom interferometers, which belong to today’s most precise sensors, are fundamentally limited by the standard quantum limit (SQL ∝1/√N) when operated with uncorrelated particles. Within our project, we will employ spin-dependent collisional interactions in Bose-Einstein condensates to generate metrologically useful entanglement to overcome this limitation. The new level of precision is then given by the Heisenberg limit, which necessitates the precise determination of the atom number with an error below the single atom level. In a new dedicated apparatus we demonstrate our single-particle resolving detection scheme with fluorescence imaging of a 3D-MOT filled with ⁸⁷Rb atoms. In contrast to absorption imaging, the signal-to-noise ratio (SNR) is greatly enhanced due to the long lifetime of the MOT and the large signal of photons scattered per atom and per unit time.

Single-particle resolving fluorescence measurements for up to 30 atoms are presented. According to our noise analysis the single-atom resolution extends to a limiting atom number of 390(20) atoms. The variance in atom number resolution is currently restricted by the stability of our laser frequency and intensity, which will be improved by active stabilization. We outline a path to approach the Heisenberg limit in phase sensitivity with mesoscopic ensembles.