Overcoming frequency resolution limits using a solid-state spin quantum sensor
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.
IQSQM 2025