Optimized pulsed sideband cooling and enhanced thermometry of trapped ions

TL;DR

This paper introduces an optimized pulsed sideband cooling framework for trapped ions, improving cooling efficiency and thermometry, especially under high initial temperatures or extended wavepackets, verified with $^{171}$Yb$^+$ ions.

Contribution

It presents a novel framework for calculating the fastest pulsed sideband cooling sequences tailored to specific experimental conditions.

Findings

Optimized cooling sequences outperform traditional methods.

Ion motional distribution after cooling is non-thermal.

Developed an improved thermometry method validated experimentally.

Abstract

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 $^{171}$Yb$^+$ 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.