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We explore routing of propagating phonons in analogy with previousexperiments on photons. Surface acoustic waves (SAWs) in the microwave regimeare scattered by a superconducting transmon qubit. The transmon can be tuned onor off resonance with the incident SAW field using an external magnetic fieldor the Autler-Townes effect, and thus the reflection and transmission of theSAW field can be controlled in time. We observe 80% extinction in thetransmission of the low power continuous signal and a 40 ns rise time of therouter. The slow propagation speed of SAWs on solid surfaces allows forin-flight manipulations of the propagating phonons. The ability to route short,100 ns, pulses enables new functionality, for instance to catch an acousticphonon between two qubits and then release it in a controlled direction.

Towards phonon routing: Controlling propagating acoustic waves in the quantum regime