Pound-locking for characterization of superconducting microresonators

TL;DR

This paper introduces a Pound-locking technique for superconducting microresonator characterization, enabling access to new resonator properties, improved measurement accuracy, and enhanced throughput over traditional methods.

Contribution

The paper presents a novel application of Pound locking for superconducting resonators, providing deeper noise analysis and better measurement performance.

Findings

Enhanced noise characterization of superconducting resonators.

Significant improvement in measurement accuracy and throughput.

Ability to access properties not measurable with traditional methods.

Abstract

We present a new application and implementation of the so-called Pound locking technique for the interrogation of superconducting microresonators. We discuss how by comparing against stable frequency sources this technique can be used to characterize properties of resonators that can not be accessed using traditional methods. Specifically, by analyzing the noise spectra and the Allan deviation we obtain valuable information about the nature of the noise in superconducting planar resonators. This technique also greatly improves the read-out accuracy and measurement throughput compared to conventional methods.