Reducing number fluctuations in an ultracold atomic sample using Faraday rotation and iterative feedback

• URL: http://arxiv.org/abs/2102.01773v2
• Date: Thu, 16 Sep 2021 02:57:12 GMT
• Title: Reducing number fluctuations in an ultracold atomic sample using Faraday rotation and iterative feedback
• Authors: R. Thomas, J. S. Otto, M. Chilcott, A.B. Deb, and N. Kj{\ae}rgaard
• Abstract summary: We demonstrate a method to reduce number fluctuations in an ultracold atomic sample using real-time feedback. We iteratively remove a fraction of the excess atoms from the sample to converge on a target proxy value.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We demonstrate a method to reduce number fluctuations in an ultracold atomic sample using real-time feedback. By measuring the Faraday rotation of an off-resonant probe laser beam with a pair of avalanche photodetectors in a polarimetric setup we produce a proxy for the number of atoms in the sample. We iteratively remove a fraction of the excess atoms from the sample to converge on a target proxy value in a way that is insensitive to environmental perturbations and robust to errors in light polarization. Using absorption imaging for out-of-loop verification, we demonstrate a reduction in the number fluctuations from $3\%$ to $0.45\%$ for samples at a temperature of 16.4 $\mu$K over the time-scale of several hours which is limited by temperature fluctuations, beam pointing noise, and photon shot noise.

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