The QFM-CASR protocol gives NV-diamond sensors sub-hertz spectral resolution across a 10 MHz to 4 GHz range with nanotesla-scale noise and phase accuracy near 0.4 degrees.
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High-resolution, Wide-frequency-range Magnetic Spectroscopy with Solid-state Spin Ensembles
The QFM-CASR protocol gives NV-diamond sensors sub-hertz spectral resolution across a 10 MHz to 4 GHz range with nanotesla-scale noise and phase accuracy near 0.4 degrees.