A superconducting qubit counts magnons in a ferrimagnet from a few to about 2000 excitations and resolves their decay with two agreed methods.
The Kittel mode and the cavity are magnetic-dipole coupled with strength gmc, while the qubit and the cavity are electric- dipole coupled with strength gqc
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High dynamic-range quantum sensing of magnons and their dynamics using a superconducting qubit
A superconducting qubit counts magnons in a ferrimagnet from a few to about 2000 excitations and resolves their decay with two agreed methods.