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We investigate a hybrid quantum system where an ensemble of nitrogen-vacancy(NV) centers in diamond is interfaced with a piezomagnetic superlattice thatsupports surface phonon polaritons (SPhPs). We show that the strong magneticcoupling between the collective spin waves in the NV spin ensemble and thequantized SPhPs can be realized, thanks to the subwavelength nature of theSPhPs and relatively long spin coherence times. The magnon-polariton couplingallows different modes of the SPhPs to be mapped and orthogonally stored indifferent spatial modes of excitation in the solid medium. Because of its easyimplementation and high tunability, the proposed hybrid structure with NV spinsand piezoactive superlattices could be used for quantum memory and quantumcomputation.

Hybrid quantum system with nitrogen-vacancy centers in diamond coupled to surface phonon polaritons in piezomagnetic superlattices