Nanoscale broadband transmission lines for spin qubit control

TL;DR

This paper presents a new nanoscale broadband microwave transmission line design that enhances spin qubit control while minimizing disturbance to charge sensors, validated through experiments up to 30 GHz.

Contribution

It introduces a novel on-chip microwave line design optimized for spin qubit manipulation with accurate simulation methods.

Findings

Successful implementation in a single-spin qubit experiment

Accurate magnetic field predictions at frequencies up to 30 GHz

Minimized disturbance to charge sensors during operation

Abstract

The intense interest in spin-based quantum information processing has caused an increasing overlap between two traditionally distinct disciplines, such as magnetic resonance and nanotechnology. In this work we discuss rigourous design guidelines to integrate microwave circuits with charge-sensitive nanostructures, and describe how to simulate such structures accurately and efficiently. We present a new design for an on-chip, broadband, nanoscale microwave line that optimizes the magnetic field driving a spin qubit, while minimizing the disturbance on a nearby charge sensor. This new structure was successfully employed in a single-spin qubit experiment, and shows that the simulations accurately predict the magnetic field values even at frequencies as high as 30 GHz.