Quantum Frequency Mixing using an N-$V$ Diamond Microscope

TL;DR

This paper demonstrates a quantum frequency mixing technique in NV diamond microscopy, enabling wide-field magnetic imaging of AC fields up to 70 MHz, surpassing previous frequency limitations and broadening applications.

Contribution

The authors implement quantum frequency mixing in NV diamond microscopy to extend the detectable frequency range to 70 MHz, enabling new high-frequency magnetic imaging capabilities.

Findings

Achieved magnetic imaging of AC currents up to 70 MHz.

Extended the frequency range beyond traditional NV magnetometry methods.

Potential applications in electronics diagnostics and quantum hardware validation.

Abstract

Wide-field magnetic microscopy using nitrogen-vacancy (NV) centers in diamond can yield high-quality magnetic images of DC and AC magnetic fields. The unique combination of micron-scale spatial resolution of scalar or vector fields at room temperature and parallel camera readout make this an appealing technique for applications in biology, geology, condensed-matter physics, and electronics. However, while NV magnetic microscopy has achieved great success in these areas, historically the accessible frequency range has been limited. In this paper, we overcome this limitation by implementing the recently developed technique of quantum frequency mixing. With this approach, we generate wide-field magnetic images of test structures driven by alternating currents up to 70 MHz, well outside the reach of DC and Rabi magnetometry methods. With further improvements, this approach could find utility in hyperspectral imaging for electronics power spectrum analysis, electronics diagnostics and troubleshooting, and quantum computing hardware validation.