Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 63: Ultra-cold atoms, ions and BEC V (with A)
Q 63.1: Talk
Friday, March 4, 2016, 11:00–11:15, f107
Production of ultracold atomic clouds at the shot noise limit through feedback — •Andrew Hilliard, Miroslav Gajdacz, Mick Kristensen, Jacob Sherson, and Jan Arlt — Institute for Physics and Astronomy, Ny Munkegade 120, 8000, Aarhus C, Denmark
The reliable production of cold atomic clouds with well-defined properties is a notoriously difficult task. Variations in the atom number and temperature typically arise due to technical fluctuations during the experimental sequence. However, non-destructive measurements of the ensemble properties during an experimental sequence allow for an active adjustment of the cooling procedure to obtain the desired outcome.
To achieve this, we use a dispersive imaging technique based on Faraday rotation combined with on-line digital image evaluation to provide feedback to the evaporative cooling sequence. Our imaging technique achieves a relative precision below 10−3 and thus allows for active feedback that can beat the atomic shot noise limit. We have implemented feedback based on the Faraday rotation signal and thus achieved run-to-run stability at the shot noise limit.