Introduction of DC line structures into a superconducting microwave 3D cavity

TL;DR

This paper introduces a noninvasive method to integrate DC wires into a superconducting microwave 3D cavity, enabling quantum device control while analyzing impacts on cavity performance and device heating effects.

Contribution

A novel technique for adding multiple DC lines into a 3D superconducting cavity without compromising its quality, demonstrated with quantum dot integration.

Findings

Cavity quality factor decreases when wires cross equipotential planes.

Successfully integrated and controlled a quantum dot device within the cavity.

Studied microwave-induced heating effects on the quantum dot.

Abstract

We report a technique that can noninvasively add multiple DC wires into a 3D superconducting microwave cavity for electronic devices that require DC electrical terminals. We studied the influence of our DC lines on the cavity performance systematically. We found that the quality factor of the cavity is reduced if any of the components of the electrical wires cross the cavity equipotential planes. Using this technique, we were able to incorporate a quantum dot (QD) device into a 3D cavity. We then controlled and measured the QD transport signal using the DC lines. We have also studied the heating effects of the QD by the microwave photons in the cavity.