2021/07/31 by A. J. Rasmusson, Marissa D'Onofrio, Yuanheng Xie +2 · 1 citation
Physics and Astronomy · #physics.atom-ph #quant-ph
paper · pdf · doi:10.1103/physreva.104.043108
published as Phys. Rev. A 104, 043108 (2021) · 11 pages, 6 figures including 2 appendices
arxiv created 2021/09/28 · arxiv updated 2021/10/26
Resolved sideband cooling is a standard technique for cooling trapped ions below the Doppler limit to near their motional ground state. Yet, the most common methods for sideband cooling implicitly rely on low Doppler-cooled temperatures and tightly confined ions, and they cannot be optimized for different experimental conditions. Here we introduce a framework which calculates the fastest possible pulsed sideband cooling sequence for a given number of pulses and set of experimental parameters, and we verify its improvement compared to traditional methods using a trapped 171Yb+ ion. After extensive cooling, we find that the ion motional distribution is distinctly non-thermal and thus not amenable to standard thermometry techniques. We therefore develop and experimentally validate an improved method to measure ion temperatures after sideband cooling. These techniques will enable more efficient cooling and thermometry within trapped-ion systems, especially those with high initial temperatures or spatially-extended ion wavepackets.