Axion search with quantum nondemolition detection of magnons

The axion provides a solution for the strong CP problem and is one of leading candidates dark matter. This paper proposes an detection scheme based on quantum nondemolition magnon, i.e., quanta collective spin excitations in solid, which expected to be excited by axion-electron interaction predicted Dine-Fischer-Srednicki-Zhitnitsky (DFSZ) model. prototype detector composed ferrimagnetic sphere as electronic target superconducting qubit. Both these are embedded inside microwave cavity, leads coherent effective between uniform magnetostatic mode crystal An upper limit coupling constant electron obtained $g_{aee}<2.6\times10^{-6}$ at 95% confidence level mass $33.117$$\mu$eV $<m_{a}<33.130$$\mu$eV.