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High-sensitivity DC magnetic field detection with ensemble NV centers by pulsed quantum filtering technology
Optics Express
|June 19, 2020
Summary
Pulsed quantum filtering enhances DC magnetic field sensitivity using nitrogen-vacancy defects. This technique improves sensitivity by an order of magnitude compared to continuous wave optically detected magnetic resonance, achieving 1nT/Hz.
Area of Science:
- Quantum sensing
- Materials science
- Solid-state physics
Background:
- Continuous wave optically detected magnetic resonance (CW-ODMR) is used for DC magnetic field sensing.
- Large ensembles of nitrogen-vacancy (NV) defects in diamond are promising for magnetometry.
- CW-ODMR faces challenges with simultaneous microwave and laser excitation, leading to spectral deterioration and sideband noise from P1 electron spins.
Purpose of the Study:
- To improve the sensitivity and signal quality of DC magnetometry using NV defects.
- To overcome limitations of CW-ODMR in large ensemble NV systems.
- To demonstrate a novel approach for high-sensitivity DC magnetic field measurements.
Main Methods:
- Implementation of continuous wave optically detected magnetic resonance (CW-ODMR).
- Application of pulsed quantum filtering (PQF) technology to mitigate spectral artifacts.
- Utilizing large ensemble nitrogen-vacancy (NV-) defects for magnetometry.
Main Results:
- Achieved a DC photon-shot-noise-limited magnetic sensitivity of 12 nT/√Hz using CW-ODMR.
- Demonstrated a magnetic sensitivity of approximately 1 nT/√Hz with PQF.
- PQF technology effectively eliminated unwanted sideband excitations and spectral deterioration.
Conclusions:
- Pulsed quantum filtering offers a significant, order-of-magnitude enhancement in DC magnetic sensitivity compared to CW-ODMR.
- PQF provides a simple yet effective method for high-sensitivity DC magnetometry with large ensemble NV- defects.
- The technique yields a pure resonance signal, crucial for accurate magnetic field measurements.
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