High-cooperativity coupling of a rare-earth spin ensemble to a superconducting resonator using yttrium orthosilicate as a substrate

Gavin Dold, Christoph W. Zollitsch, James O'Sullivan +6

Yttrium orthosilicate (Y${}_2$SiO${}_5$, or YSO) has proved to be a convenient host for rare-earth ions used in demonstrations of microwave quantum memories and optical memories with m…