Demonstration of highly-sensitive wideband microwave sensing using ensemble nitrogen-vacancy centers

Abstract

Microwave magnetometry is essential for the advancement of microwave technologies. We demonstrate a broadband microwave sensing protocol using the AC Zeeman effect with ensemble nitrogen-vacancy (NV) centers in diamond. A widefield microscope can visualize the frequency characteristics of the microwave resonator and the spatial distribution of off-resonant microwave amplitude. Furthermore, by combining this method with dynamical decoupling, we achieve the microwave amplitude sensitivity of $5.2\mu \mathrm{T}/\sqrt{\mathrm{Hz}}$, which is 7.7 times better than $40.2\mu \mathrm{T}/\sqrt{\mathrm{Hz}}$ obtained using the protocol in previous research over a sensing volume of $2.77\mu \mathrm{m}\times 2.77\mu \mathrm{m}\times 30\mathrm{nm}$. Our achievement is a concrete step in adapting ensemble NV centers for wideband and widefield microwave imaging.

6 pages, 4 figures, and supplementary materials

References in corpus (2)

• Tackling Systematic Errors in Quantum Logic Gates with Composite Rotations
• Construction and operation of a tabletop system for nanoscale magnetometry with single nitrogen-vacancy centers in diamond