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Quantum Memory Enhanced Multipoint Correlation Spectroscopy for Statistically Polarized NMR
Tobias Spohn1, Nicolas Staudenmaier1, Philipp J Vetter1
1Ulm University, Institute of Quantum Optics and Center for Integrated Quantum Science and Technology (IQST), Albert-Einstein-Allee 11, 89081 Ulm, Germany.
Physical Review Letters
|January 20, 2026
Summary
Multipoint correlation spectroscopy enhances nanoscale nuclear magnetic resonance (NMR) sensitivity using spin ensembles. This novel method improves measurements of statistically polarized nuclear spins, achieving high frequency precision.
Area of Science:
- Quantum sensing
- Spectroscopy
- Nanoscale science
Background:
- Solid-state spin sensors offer promising nanoscale nuclear spin detection.
- Leveraging spin ensembles enhances sensitivity for statistically polarized nuclear spins.
Purpose of the Study:
- Introduce multipoint correlation spectroscopy for temporally efficient nanoscale measurements.
- Combine correlation spectroscopy and quantum heterodyne detection for enhanced sensitivity.
Main Methods:
- Developed a theoretical framework for multipoint correlation spectroscopy.
- Experimental proof of concept using a nitrogen vacancy center in diamond.
- Utilized spin ensembles for signal detection.
Main Results:
- Demonstrated temporally efficient measurements of statistically polarized samples.
- Achieved single hertz uncertainty in estimated signal frequency.
- Validated the technique with a nitrogen vacancy center in diamond.
Conclusions:
- Multipoint correlation spectroscopy enables sensitive nanoscale NMR with spin ensembles.
- The technique offers potential for advanced applications in nanoscale magnetic resonance.
- High frequency precision achieved highlights the method's effectiveness.
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