Fig. 1: Quantum delay line.
From: Quantum communication with itinerant surface acoustic wave phonons
a Schematic representation of the two quantum communication nodes and the phononic quantum channel. Each node comprises a superconducting qubit, a tunable coupler that allows shaping phonon release and capture, and a unidirectional phonon transducer. Details in the Methods section. b Circuit diagram of the assembled device. Each qubit Qj is excited through its dedicated Qxyj microwave line and frequency-controlled through a separate Qz j flux-bias line, and each tunable coupler Gk is controlled via its associated Gz k flux-bias line.
