Abstract：
:Solid-state quantum acoustodynamic (QAD) systems provide a compact platform for quantum information storage and processing by coupling acoustic phonon sources with superconducting or spin qubits. The multi-mode composite high-overtone bulk acoustic wave resonator (HBAR) is a popular phonon source well suited for QAD. However, scattering from defects, grain boundaries, and interfacial/surface roughness in the composite transducer severely limits the phonon relaxation time in sputter-deposited devices. Here, we grow an epitaxial-HBAR, consisting of a metallic NbN bottom electrode and a piezoelectric GaN film on a SiC substrate. The acoustic impedance-matched epi-HBAR has a power injection efficiency >99% from transducer to phonon cavity. The smooth interfaces and low defect density reduce phonon losses, yielding (f × Q) and phonon lifetimes up to 1.36 × 1017 Hz and 500 µs respectively. The GaN/NbN/SiC epi-HBAR is an electrically actuated, multi-mode phonon source that can be directly interfaced with NbN-based superconducting qubits or SiC-based spin qubits.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Gokhale VJ,Downey BP,Katzer DS,Nepal N,Lang AC,Stroud RM,Meyer DJdoi
10.1038/s41467-020-15472-wsubject
Has Abstractpub_date
2020-05-08 00:00:00pages
2314issue
1issn
2041-1723pii
10.1038/s41467-020-15472-wjournal_volume
11pub_type
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