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A nanoelectromechanical system made from a nanobeam embedded in a phononic crystal and coupled to a pair of superconducting microwave oscillators can couple hypersonic sound quanta at 0.425 GHz and light quanta with high coherence.
Far-field photons can be coupled to acoustic graphene plasmons with near 100% efficiency and used to acquire infrared spectra of thin, subnanometre-layer samples.
On the route towards a useful quantum computer, we must not ignore the materials challenges facing us nor the opportunities that materials science may provide for disruptive new qubits.