Surface acoustic wave resonators in the quantum regime
Surface acoustic wave resonators in the quantum regime
We present systematic measurements of the quality factors of surface acoustic wave (SAW) resonators on ST-X quartz in the gigahertz range at a temperature of $10\phantom{\rule{0.16em}{0ex}}\mathrm{mK}$. We demonstrate an internal quality factor ${Q}_{\mathrm{i}}$ approaching $0.5$ million at $0.5\phantom{\rule{0.16em}{0ex}}\text{GHz}$ and show that ${Q}_{\mathrm{i}}\ensuremath{\ge}4.0\ifmmode\times\else\texttimes\fi{}{10}^{4}$ is achievable up to $4.4\phantom{\rule{0.16em}{0ex}}\text{GHz}$. We show evidence …