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Quantum acoustodynamics (QAD) is a rapidly developing field of research, offering possibilities to realize and study macroscopic quantum-mechanical systems in a new range of frequencies and implement transducers and new types of memories for hybrid quantum devices. Here we propose a novel design for a versatile diamond QAD cavity operating at gigahertz (GHz) frequencies, exhibiting effective mode volumes of about 10-4λ3. Our phononic crystal waveguide cavity implements a nonresonant analog of the optical lightning-rod effect to localize the energy of an acoustic mode into a deeply subwavelength volume. We demonstrate that this confinement can readily enhance the orbit-strain interaction with embedded nitrogen-vacancy (NV) centers towards the highcooperativity regime and enable efficient resonant cooling of the acoustic vibrations towards the ground state using a single NV. This architecture can be readily translated towards setup with multiple cavities in one- or two-dimensional phononic crystals and the underlying nonresonant localization mechanism will pave the way to further enhance optoacoustic coupling in phoxonic crystal cavities.
Bibliographical notePublished by the American Physical Society in Physical Review Research, 2(3), 033153. The original publication is available at https://doi.org/10.1103/PhysRevResearch.2.033153. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.
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