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We report measurements of a superconducting coplanar waveguide resonator(CPWR) coupled to a sphere of yttrium-iron garnet. The non-uniform CPWR fieldallows us to excite various magnon modes in the sphere. Mode frequencies andrelative coupling strengths are consistent with theory. Strong coupling isobserved to several modes even with, on average, less than one excitationpresent in the CPWR. The time response to square pulses shows oscillations atthe mode splitting frequency. These results indicate the feasibility ofcombining magnonic and planar superconducting quantum devices.

Strong coupling of magnons in a YIG sphere to photons in a planar superconducting resonator in the quantum limit