Axel Hoffmann

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

  1. Sonia Rani,
  2. Xi Cao,
  3. Alejandro E. Baptista,
  4. Axel Hoffmann,
  5. and Wolfgang Pfaff
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.
arxiv pdf