Warwick and NRC Canada develop phonon-based links to scale quantum chip connectivity

Researchers from the University of Warwick and NRC Canada have introduced a chip architecture called Quantum Phononic Links, designed to overcome a key bottleneck in quantum computing: the inability of qubits to communicate beyond immediate neighbors. The system uses acoustic vibrations, or phonons, traveling through a semiconductor's crystal lattice to transmit quantum information across distances of up to 300 mm — matching standard industrial wafer sizes. The technology relies on compressively strained germanium grown on silicon, a material whose physical properties make qubits sensitive to the precise vibrations that carry data. Unlike earlier approaches using microwaves or surface acoustic waves, Quantum Phononic Links are built directly into the chip substrate, keeping the design compact and compatible with existing silicon-based manufacturing infrastructure. The researchers argue that reliable long-distance qubit connectivity is essential for scaling quantum processors to the millions of qubits needed for practical applications.