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Trapped Ion Quantum Computing

Λ-Enhanced Gray Molasses Cooling of ⁸⁵Rb Atoms in Tweezers Using the D₂ Line

arXiv

Authors: Deon Janse van Rensburg, Rogier Venderbosch, Yuri van der Werf, Jesus del Pozo Mellado, Marijn Venderbosch, Rianne Lous, Edgar Vredenbregt, Servaas Kokkelmans

Year

2025

Paper ID

5849

Status

Preprint

Abstract Read

~2 min

Abstract Words

108

Citations

N/A

Abstract

We demonstrate the implementation of Λ-enhanced gray molasses cooling on the D₂ line of ⁸⁵Rb atoms in an optical tweezer array. This technique yields lower atomic temperatures of 4.0(2) μK compared to red-detuned polarization gradient cooling, and consequently extends the T₂^* coherence time of the hyperfine clock qubit by a factor of 1.5. The method is alignment-free and can be readily implemented on laser beams used for magneto-optical trapping, as it only requires frequency and phase modulation control. Our experimental observations are corroborated by a numerical model based on a semi-classical force approach extended to a four-level system, including two hyperfine states of the upper manifold that are 120 MHz apart.

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This paper contributes to the Trapped-Ion Quantum Computing research area in the Quantum Articles archive.
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We demonstrate the implementation of Λ-enhanced gray molasses cooling on the D2 line of ^85Rb atoms in an optical tweezer array.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2512.17653 [2] arXiv https://arxiv.org/abs/2512.17653 [3] Publisher https://arxiv.org/abs/2512.17653

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