Coupling of a locally implanted rare-earth ion ensemble to a superconducting micro-resonator

Abstract

We demonstrate the coupling of rare-earth ions locally implanted in a substrate (Gd${}^{3+}$ in Al${}_2$O${}_3$) to a superconducting NbN lumped-element micro-resonator. The hybrid device is fabricated by a controlled ion implantation of rare-earth ions in well-defined micron-sized areas, aligned to lithographically defined micro-resonators. The technique does not degrade the internal quality factor of the resonators which remain above $10^5$. Using microwave absorption spectroscopy we observe electron-spin resonances in good agreement with numerical modelling and extract corresponding coupling rates of the order of $1$ MHz and spin linewidths of $50-65$ MHz.

arXiv comment4 pages, 2 Figures

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