Integrated phononic waveguides in diamond
Sophie Weiyi Ding (Harvard University)
Benjamin Pingault (Kavli institute of nanoscience Delft, Harvard University, TU Delft - Communication QuTech, TU Delft - QID/Taminiau Lab, TU Delft - QuTech Advanced Research Centre)
Linbo Shao (Virginia Tech, Harvard University)
Neil Sinclair (Harvard University)
Bartholomeus Machielse (AWS Center for Quantum Computing, Harvard University)
Cleaven Chia (Harvard University)
Smarak Maity (Harvard University)
Marko Lončar (Harvard University)
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Abstract
Efficient generation, guiding, and detection of phonons, or mechanical vibrations, are of interest in various fields, including radio-frequency communication, sensing, and quantum information. Diamond is a useful platform for phononics because of the presence of strain-sensitive spin qubits, and its high Young's modulus, which allows for low-loss gigahertz devices. We demonstrate a diamond phononic waveguide platform for generating, guiding, and detecting gigahertz-frequency surface acoustic wave (SAW) phonons. We generate SAWs using interdigital transducers integrated on AlN/diamond and observe SAW transmission at 4-5 GHz through both ridge and suspended waveguides, with wavelength-scale cross sections (approximately 1 m2) to maximize spin-phonon interaction. This work is a crucial step for developing acoustic components for quantum phononic circuits with strain-sensitive color centers in diamond.