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We present cavity QED experiments with an Er:YSO crystal magnetically coupledto a 3D cylindrical sapphire loaded copper resonator. Such waveguide cavitiesare promising for the realization of a superconducting quantum processor. Here,we demonstrate the coherent integration of a rare-earth spin ensemble with the3D architecture. The collective coupling strength of the Er$^{3+}$ spins to the3D cavity is 21 MHz. The cylindrical sapphire loaded resonator allowed us toexplore the anisotropic collective coupling between the rare-earth dopedcrystal and the cavity. This work shows the potential of spin doped solids in3D quantum circuits for application as microwave quantum memories as well asfor prospective microwave to optical interfaces.

3D Cavity quantum electrodynamics with a rare-earth spin ensemble