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Theses

Scaling-up the Tweezer Platform - Trapping Arrays of Single Atoms in a Cryogenic Environment

Kai-Niklas Schymik 1 
1 Laboratoire Charles Fabry / Optique Quantique
LCF - Laboratoire Charles Fabry
Abstract : Tweezer atom arrays are a promising platform for the quantum simulation of spin models. As for most quantum simulation platforms, scaling up the number of individually controlled quantum objects is a major challenge. In this thesis, I present our work on lifting principal limitations to achieving large defect-free atom arrays with high fidelities. These limitations of the preparation fidelities include the vacuum-limited lifetime of a single atom in the tweezer, and the time needed to prepare large arrays atom-by-atom with a moveable optical tweezer. We first improved the assembly of large defect-free atom arrays by developing a new algorithmic framework. Using the new framework, we increased the number of atoms from around forty to two hundred on our room-temperature setup. We then built a novel cryogenic atom tweezer platform in which the single-atom lifetime is over 6000 seconds, an approximately 300-fold improvement over our room-temperature experiment. We describe the design and construction of the new cryogenic setup and evaluate its performance in a series of tests. Finally, we demonstrate the trapping of single atoms in tweezer arrays at cryogenic temperatures and analyze different loss mechanisms present during the lifetime measurement. These results open the way to large-scale quantum simulations on our platform.
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Submitted on : Friday, April 15, 2022 - 2:47:31 PM
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Kai-Niklas Schymik. Scaling-up the Tweezer Platform - Trapping Arrays of Single Atoms in a Cryogenic Environment. Optics [physics.optics]. Université Paris-Saclay, 2022. English. ⟨NNT : 2022UPASP031⟩. ⟨tel-03643133⟩

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