A NIS junction and an MKID array measure substrate phonon burst speed in silicon, extracting vph = 12.9 ± 2.6 mm/µs and a 1.3% phonon-to-quasiparticle conversion efficiency from a power-dependent velocity model.
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Propagation velocity measurements of substrate phonon bursts using MKIDs for superconducting circuits
A NIS junction and an MKID array measure substrate phonon burst speed in silicon, extracting vph = 12.9 ± 2.6 mm/µs and a 1.3% phonon-to-quasiparticle conversion efficiency from a power-dependent velocity model.