High dynamic-range quantum sensing of magnons and their dynamics using a superconducting qubit

TL;DR

This paper demonstrates the use of a superconducting qubit as a high-dynamic-range quantum sensor to detect and analyze magnon properties and dynamics with high precision over a broad excitation range.

Contribution

It introduces a novel quantum sensing method employing superconducting qubits for precise magnon characterization and decay measurement.

Findings

Sensitive detection of magnons with few excitations

Accurate resolution of magnon decay dynamics

Broad excitation range of about 2000

Abstract

Magnons can endow quantum devices with new functionalities. Assessing their potential requires precise characterization of magnon properties. Here, we use a superconducting qubit to probe magnons in a ferrimagnet over a range of about 2000 excitations. Using qubit control and parametrically induced qubit-magnon interactions we demonstrate few-excitation sensitive detection of magnons and are able to accurately resolve their decay. These results introduce quantum circuits as high-dynamic range probes for magnons and provide an avenue toward sensitive detection of nontrivial magnon dynamics.