SAW Coupled Diamond NV− Spin Oscillators and Quantum Sensors

Negatively charged nitrogen-vacancy defects (NV-) in diamond offer a unique spin 1 system with weak temperature dependent emission spectra. The circular polarization of phonons of the surface acoustic waves (SAW) on lithium niobate (LiNbO
3
) have been shown to magnetize nickel. The main objective of this work is to develop feedback mechanisms to couple SAW and the spin transitions in the NV-ground state to realize a stable oscillator for clocks, magnetometers, electrometers, and Qubits. Using diamond with NV- centers deposited on a 433.6225 MHz SAW filter, we show that NV- states affect the SAW propagation properties and SAW affects the NV- spin states.