Circuit QAD and quantum optomechanics with bulk acoustic wave resonators

Bulk acoustic wave (BAW) resonators are mechanical oscillators that confine sound waves in a solid-state material. Due to their use in a wide range of classical devices, they have been engineered to exhibit high quality factors, and their interactions with electromagnetic fields have been extensively studied. Recently, BAW resonators have also rapidly developed into a promising platform for new quantum devices. In this talk, I will give an overview of our work on interfacing them with microwave frequency superconducting circuits and infrared frequency optics. I will present our demonstrations of the strong dispersive regime in a circuit quantum acousto-dynamics device and Brillouin cavity optomechanics at cryogenic temperatures.