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State-of-the-art methods for sensing weak AC fields are only efficient in thelow frequency domain (< 10 MHz). The inefficiency of sensing high frequencysignals is due to the lack of ability to use dynamical decoupling. In thispaper we show that dynamical decoupling can be incorporated into high frequencysensing schemes and by this we demonstrate that the high sensitivity achievedfor low frequency can be extended to the whole spectrum. While our scheme isgeneral and suitable to a variety of atomic and solid-state systems, weexperimentally demonstrate it with the nitrogen-vacancy center in diamond. Fora diamond with natural abundance of $^{13}$C we achieve coherence times up to1.43 ms resulting in a smallest detectable magnetic field strength of 4 nT at1.6 GHz. Attributed to the inherent nature of our scheme, we observe anadditional increase in coherence time due to the signal itself.

Narrow-bandwidth sensing of high-frequency fields with continuous dynamical decoupling