Honeycomblike Phononic Networks of Spins with Closed Mechanical Subsystems
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Abstract
In a mechanical network of solid-state spins, spin qubits in adjacent mechanical resonators are coupled via vibrations. This nearest-neighbor (NN) mechanical coupling, however, can also lead to the formation of spectrally dense mechanical modes, with crosstalk spoiling the required control of individual modes. With phononic band-gap engineering, a honeycomblike mechanical network is designed such that vibrations can be confined to any two adjacent resonators and the waveguide between them, enabling NN coupling without spectrally dense modes. This mechanical network can serve as an experimental platform for exploring topological quantum excitations and quantum computing.