Quantum communication with itinerant surface acoustic wave phonons

Surface acoustic waves are commonly used in classical electronics applications, and their use quantum systems is beginning to be explored, as evidenced by recent experiments using Fabry-P\'erot resonators. Here we explore for communication, where demonstrate a single-phonon surface wave transmission line, which links two physically-separated qubit nodes. Each node comprises microwave phonon transducer, an externally-controlled superconducting variable coupler, qubit. Using this system, precisely-shaped individual itinerant phonons coherently transfer information between the physically-distinct nodes, enabling high-fidelity node-to-node of states well generation two-node Bell state. We further dispersive interactions emitted from one interacting with remote node. The observed promise future optics-style phonons.