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arXiv · 2501.06162

On-the-Spot Loading of Single-Atom Traps

Mark IJspeert·Naomi Holland·Benjamin Yuen·Axel Kuhn
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Abstract

Reconfigurable arrays of trapped single atoms are an excellent platform for the simulation of many-body physics and the realisation of high-fidelity quantum gates. The confinement of atoms is often achieved with focussed laser beams acting as optical dipole-force traps that allow for both static and dynamic positioning of atoms. In these traps, light-assisted collisions -- enhancing the two-atom loss rate -- ensure that single atom occupation of traps can be realised. However, the time-averaged probability of trapping a single atom is limited to $0.5$ when loading directly from a surrounding cloud of laser-cooled atoms, preventing deterministic filling of large arrays. In this work, we demonstrate that increasing the depth of a static, optical dipole trap enables the transition from fast loading on a timescale of $2.1\,$s to an extended trap lifetime of $7.9\,$s. This method demonstrates an achievable filling ratio of $(79\pm2)\,\%$ without the need of rearranging atoms to fill vacant traps.

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Mark IJspeert, Naomi Holland, Benjamin Yuen, Axel Kuhn. 2025-01-10. On-the-Spot Loading of Single-Atom Traps. https://arxiv.org/abs/2501.06162

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