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Hyperpolarized Molecular Nuclear Spins Achieve Magnetic Amplification
Shengbang Zhou1,2, Qing Li1,2, Yi Ren1
1University of Science and Technology of China, Laboratory of Spin Magnetic Resonance, School of Physical Sciences, Anhui Province Key Laboratory of Scientific Instrument Development and Application, Hefei 230026, China.
Physical Review Letters
|April 17, 2026
Summary
Researchers developed a new method using hyperpolarized molecular nuclear spins to significantly boost magnetic field detection. This breakthrough enhances magnetic responsivity, paving the way for advanced quantum sensors.
Area of Science:
- Quantum Sensing
- Nuclear Magnetic Resonance
- Spintronics
Background:
- Nuclear spins have low signal responsivity compared to electron spins due to small gyromagnetic ratios and polarization challenges.
- Existing magnetometers struggle with sensitivity, limiting applications in precision measurements.
Purpose of the Study:
- To develop a novel approach for investigating hyperpolarized molecular nuclear spins' response to magnetic fields.
- To achieve orders-of-magnitude enhanced magnetic responsivity for nuclear spin-based sensing.
Main Methods:
- Utilizing hyperpolarized molecules with proton spins for magnetic amplification studies.
- Extending amplification techniques to hyperpolarized scalar-coupled multispin molecules.
- Analyzing magnetic interference effects causing anomalous amplification.
Main Results:
- Demonstrated orders-of-magnitude enhanced magnetic responsivity over proton and Overhauser magnetometers.
- Achieved substantial magnetic amplification exceeding 10% in multispin molecules.
- Observed anomalous amplification with dispersive frequency dependence due to magnetic interference.
Conclusions:
- Hyperpolarized molecular nuclear spins offer potential for a new generation of quantum sensors.
- The enhanced responsivity is promising for highly accurate absolute magnetometry.
- This technique could enable exploration of fundamental physics, such as axion-nucleon interactions.
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