A phononic network of spin qubits for quantum computing*

We describe a general architecture for networking solid-state qubits through
vibrational motion. The architecture makes use of alternating phononic
crystal waveguides to facilitate communication between distant qubits in a
scalable manner. We discuss a specific realization of the architecture
using Nitrogen vacancy centers in diamond, and show that state-of-the-art
devices operating at 500 mK can implement two-qubit universal quantum gates
with a fidelity exceeding 0.99.