Compact phononic circuits guide sound at 1.5 GHz frequencies for chip-scale devices

https://techxplore.com/news/2025-09-compact-phononic-circuits-gigahertz-frequencies.html

"compact, reconfigurable, based on waveguides, topological edge structures... GHz so compatible with existing infrastructure... light waves non-scattering... topological sound transport and a phononic Mach–Zehnder interferometer directly on a chip at gigahertz frequencies... communications acoustic filters, phonon-based  quantum processors, high-precision sensors, hybrid communication/ computer systems"