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Quantum-enhanced sensing and synthetic Landau levels with ultracold dysprosium atoms

Abstract : This thesis presents several experimental studies based on light-spin interaction in ultracold gases of dysprosium. The complex electronic structure of dysprosium is at the origin of peculiar atomic properties, which can be used to explore a large variety of physical phenomena. In the first part, we give a global description of the apparatus, and of the experimental protocol that leads to the production of degenerate gases of bosonic dysprosium. A key step of our experimental sequence consists in using the intercombination line at 626 nm to perform in-trap Doppler cooling. We show in particular that the strong anisotropy of the excited state's polarizability is beneficial for the following evaporative cooling scheme. In the second part, we present experiments that use the strong light-spin coupling associated to this intercombination line to manipulate the internal states of the atoms and to realize non-classical spin states. We focus on the realization of N00N states, which are coherent superpositions of classical states with opposite magnetizations. We experimentally demonstrate that the magnetic field sensitivity of these states is close to the Heisenberg limit. The last part is dedicated to the study of quantum Hall physics, which we realize by encoding a synthetic dimension in the internal degree of freedom of the atoms. We show in particular that, using spin-orbit coupling, we realize a system that has the same structure as Landau levels. We probe paradigmatic properties of the lowest Landau level: suppressed dispersion in the bulk, chiral edge modes, cyclotron and skipping orbits, and a Hall response that is characteristic of a non-trivial topology.
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https://hal.archives-ouvertes.fr/tel-02495722
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Submitted on : Thursday, September 16, 2021 - 9:36:33 AM
Last modification on : Friday, December 3, 2021 - 11:43:18 AM

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  • HAL Id : tel-02495722, version 2

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Thomas Chalopin. Quantum-enhanced sensing and synthetic Landau levels with ultracold dysprosium atoms. Quantum Gases [cond-mat.quant-gas]. Sorbonne Université, 2019. English. ⟨NNT : 2019SORUS589⟩. ⟨tel-02495722v2⟩

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