Adiabatic Cooling of Planar Motion in a Penning Trap Ion Crystal to Sub-Millikelvin Temperatures

TL;DR

This paper demonstrates through simulations that adiabatic tuning of rotation frequency in a Penning trap can enhance cooling of planar ion crystal modes to sub-millikelvin temperatures, improving quantum information processing capabilities.

Contribution

It introduces a novel method of adiabatic cooling by dynamically tuning rotation frequency to achieve lower temperatures in planar ion crystal modes.

Findings

Achieved sub-millikelvin temperatures for planar modes.

Enhanced spectral resolution of drumhead modes.

Demonstrated feasibility via numerical simulations.

Abstract

Two-dimensional planar ion crystals in a Penning trap are a platform for quantum information science experiments. However, the low-frequency planar modes of these crystals are not efficiently cooled by laser cooling, which can limit the utility of the drumhead modes for quantum information processing. Recently, it has been shown that nonlinear mode coupling can enhance the cooling of the low-frequency planar modes. Here, we demonstrate in numerical simulations that this coupling can be dynamically tuned by adiabatically changing the rotation frequency of the ion crystal during experiments. Furthermore, we show that this technique can, in addition, produce lower temperatures for the low-frequency planar modes via an adiabatic cooling process. This result allows cooling of the planar modes to sub-millikelvin temperatures, resulting in improved spectral resolution of the drumhead modes at experimentally relevant rotation frequencies, which is crucial for quantum information processing applications.