A versatile laser-machined rf trap for arrays of 100+ ions

Research Overview

This paper introduces a macroscopic rf Paul trap designed to support a wide range of ion crystal geometries, including long 1D chains and lateral 2D arrays containing more than 100 ions. By utilizing precision-machined fused silica wafers, the authors achieve high fabrication tolerances that allow for smaller feature sizes and improved control over the trapping potential compared to traditional macroscopic traps. The design is specifically optimized for quantum simulation experiments, where flexibility in potential shaping is more critical than the rapid shuttling capabilities required for universal quantum computing.

Design and Versatility

The trap structure consists of five stacked wafers, including ten independently biased dc electrodes. This electrode configuration allows researchers to tailor the axial potential to create various ion arrangements, such as equispaced 1D strings, split-well chains, and 2D lateral crystals. The authors demonstrate that by adjusting the voltages on these electrodes, they can tune radial secular frequencies, compensate for micromotion, and rotate the principal axes of the trap to minimize unwanted rf-driven heating in 2D configurations.

Performance and Characterization

The authors characterize the trap by measuring radial secular frequencies, which exceed 2 MHz, and by quantifying micromotion modulation indices. They report a center-of-mass heating rate of approximately 257 quanta/s, which is notably lower than that of similar room-temperature laser-machined traps. The study confirms the stability of various ion configurations, ranging from 31-ion 1D chains to 2D arrays, and provides all design files and documentation to the community to lower the barrier for adopting this platform.

This work provides a high-performance, accessible hardware platform for researchers conducting quantum simulation experiments. By offering a design that is both easy to fabricate and highly flexible, the authors enable the study of complex many-body physics and quantum chemical dynamics in diverse ion geometries without the high costs and long development times associated with more complex, monolithic trap architectures.