Parity measurement in the strong dispersive regime of circuit quantum acoustodynamics (Part II)

Mechanical resonators are emerging as an important new platform for quantum science and technologies.

By interfacing mechanical resonators with superconducting circuits, circuit quantum acoustodynamics (cQAD) can make a variety of important tools available for manipulating and measuring quantum states of mechanical motion.

We demonstrate direct measurements of the phonon number distribution and parity of non-classical mechanical states, which are useful for a variety of protocols such as quantum state preparation and error correction. In this talk, we show the use of a cQAD device operating in the strong dispersive regime to directly map the phonon number parity onto the qubit state. We then use this ability to perform full Wigner tomography of the phonon state.