Qingyun Cao, Genko T. Genov, Yaoming Chu, Jianming Cai, Yu Liu, Alex Retzker, Fedor Jelezko,arXiv:2506.20416 (2025)
We demonstrate experimentally a protocol for superresolution quantum sensing that resolves two incoherent signals with sub-kHz frequency separation using a solid-state spin sensor. By utilizing the naturally occurring signal noise, we identify optimal interrogation times to make the estimation uncertainty remains finite even when the signal frequencies approach each other.
