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Piezoelectric Nanocavity Interface for Strong Coupling between a Superconducting Circuit, Phonon, and Spin

MetadataDetails
Publication Date2023-06-15
JournalPhysical Review Applied
AuthorsHamza Raniwala, Stefan Krastanov, Maree L. Hackett, Matt Eichenfield, Dirk Englund
InstitutionsDEVCOM Army Research Laboratory, United States Army Combat Capabilities Development Command
Citations6

We introduce a hybrid tripartite quantum system for strong coupling between a semiconductor spin, a mechanical phonon, and a microwave excitation of a superconducting circuit. Consisting of a piezoelectric resonator with an integrated diamond strain concentrator, this system achieves microwave-acoustic and spin-acoustic coupling rates of approximately megahertz or greater, allowing simultaneous ultrahigh cooperativities (approximately ${10}^{3}$ and approximately ${10}^{2}$, respectively). From finite-element modeling and master-equation simulations, we estimate superconducting-circuit-to-spin quantum state transfer fidelities exceeding 0.95 on the basis of separately demonstrated device parameters. We anticipate that this device will enable hybrid quantum architectures that leverage the advantages of both superconducting circuits and solid-state spins for information processing, memory, and networking.