Characterization of Inner Control Electrode Shapes for Multi-Layer Surface-Electrode Ion Traps

TL;DR

This paper analyzes asymmetric inner control electrode shapes in multi-layer surface-electrode ion traps, demonstrating their advantages in compactness, efficiency, and scalability for quantum processors.

Contribution

It introduces a systematic analysis of asymmetric inner control electrodes, showing their benefits over traditional designs in ion trap scalability and control efficiency.

Findings

Asymmetric inner electrodes improve space efficiency.

Eliminating outer electrodes reduces control complexity.

Enhanced control voltage efficiency enables integrated Cryo-CMOS use.

Abstract

Microfabricated surface-electrode traps are a scalable platform for trapped-ion quantum processors. Recent advances in fabrication techniques have enabled the design of increasingly complex multi-layer structures. Yet the control electrodes remain mostly unchanged and of rectangular shape. We systematically analyze asymmetric inner control electrode shapes for simultaneous axial and radial control in multi-layer surface traps, characterize and compare a selection of different shapes, and verify their capabilities in realistic use-case scenarios for ion transport and micromotion compensation. Eliminating the need for the commonly used additional outer control electrodes, asymmetric inner control electrodes increase the compactness and space efficiency of surface-electrode traps while concurrently reducing the number of control signals. The improved control voltage efficiency of using solely inner electrodes enables the device's entire direct-current (DC) supply to be provided by integrated Cryo-CMOS circuits, further enhancing the scalability of the processor.