Detecting nuclear spins at the nanoscale is a key challenge for advancing nuclear magnetic resonance spectroscopy beyond its traditional limits. In this work, we introduce multipoint correlation spectroscopy, a new measurement approach that combines correlation spectroscopy with quantum heterodyne detection to efficiently detect statistically polarized nuclear spin signals using spin ensembles. We develop a theoretical framework for the method and demonstrate its feasibility
experimentally using a nitrogen-vacancy center in diamond, achieving single-hertz precision in frequency estimation. These results highlight the potential of the technique for high-sensitivity nanoscale NMR applications with sensor spin ensembles.
The research has been published in Physical Review Letters and can be viewed here (link to: doi.org/10.1103/1cj2-rxkm).
Quantum Memory Enhanced Multipoint Correlation Spectroscopy for Statistically Polarized NMR Publiziert
Ulm University Ulm University
We introduce "multipoint correlation spectroscopy", a new technique that combines correlation spectroscopy and quantum heterodyne detection to enable highly sensitive and temporally efficient nanoscale nuclear magnetic resonance (NMR) measurements using spin ensembles, achieving
single-hertz frequency precision.