A phononic crystal coupled to a transmission line via an artificial atom. Experimental data for the article figures

We study a phononic crystal interacting with an articial atom - a
superconducting quantum system - in the quantum regime. The phononic
crystal is made of a long lattice of narrow metallic stripes on a quatz
surface. The articial atom in turn interacts with a transmission line.
Therefore, two degrees of freedom of different nature, acoustic and
electromagnetic, are coupled with a single quantum object. A scattering
spectrum of propagating electromagnetic waves on the articial atom
visualizes acoustic modes of the phononic crystal. We simulate the system
and found quasinormal modes of our phononic crystal and their properties.
The calculations are consistent with the experimentally found modes, which
are tted to the dispersion branches of the phononic crystal near the rst
Brillouin zone edge. Our geometry allows to realize effects of quantum
acoustics on a simple and compact phononic crystal.