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Enhanced Quantum Magnetometry with a Femtosecond Laser-Written Integrated Photonic Diamond Chip.
Yanzhao Guo1,2, Giulio Coccia3,4, Vinaya Kumar Kavatamane5
1School of Engineering, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, United Kingdom.
Nano Letters
|April 21, 2025
Summary
Researchers enhanced quantum magnetometry using nitrogen-vacancy centers in diamond. A buried waveguide improved sensitivity for magnetic field sensing, achieving an order of magnitude improvement over conventional methods.
Area of Science:
- Quantum sensing
- Diamond quantum technologies
- Optoelectronics
Background:
- Ensemble negatively charged nitrogen-vacancy (NV) centers in diamond are highly promising for quantum sensing applications.
- Optimizing sensitivity requires increasing sampled spins and improving coupling to detection systems without compromising spin properties.
Purpose of the Study:
- To demonstrate enhanced quantum magnetometry using a buried laser-written waveguide in diamond.
- To investigate the spin coherence properties of waveguide-coupled NV centers.
- To achieve high-sensitivity magnetic field sensing in an integrated photonic chip.
Main Methods:
- Fabrication of a buried laser-written waveguide in diamond containing 4.5 ppm nitrogen-vacancy centers.
- Characterization of spin coherence properties of waveguide-coupled NV centers.
- Demonstration of fiber-coupled, on-chip waveguide-enhanced magnetic field sensing.
Main Results:
- Waveguide-coupled NV centers maintained spin coherence comparable to pristine diamond.
- Achieved DC magnetic field sensitivity of 63 pT·Hz-1/2 and AC sensitivity of 20 pT·Hz-1/2.
- Demonstrated over an order of magnitude improvement in sensitivity compared to confocal detection.
Conclusions:
- Buried waveguides enable enhanced quantum magnetometry with NV ensembles in diamond.
- Integrated photonic chip sensors offer significant sensitivity improvements for magnetic field detection.
- This approach paves the way for advanced, high-sensitivity quantum magnetometers.
