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Nanoscale Vector dc Magnetometry via Ancilla-Assisted Frequency Up-Conversion.
Yi-Xiang Liu1, Ashok Ajoy1,2, Paola Cappellaro1
1Research Laboratory of Electronics and Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Physical Review Letters
|April 2, 2019
Summary
Researchers developed a new hybrid platform for nanoscale vector magnetometry. This method uses a sensor and ancillary qubit to precisely measure static magnetic fields, improving sensitivity and spatial resolution.
Area of Science:
- Quantum sensing
- Nanoscale physics
- Materials science
Background:
- High-sensitivity, high-resolution static magnetic field sensing is crucial for physics, bioimaging, and materials science.
- Existing vector magnetometry often requires sensor ensembles or sacrifices sensitivity.
- Nitrogen-vacancy (NV) centers in diamond are a versatile magnetometry platform.
Purpose of the Study:
- To introduce a novel hybrid magnetometry platform for nanoscale vector magnetometry of static fields.
- To demonstrate a method overcoming limitations of current vector magnetometry techniques.
- To achieve sensitive vector dc magnetometry at the nanoscale.
Main Methods:
- A hybrid platform combining a sensor (NV center) and an ancillary qubit (nuclear spin).
- Frequency up-conversion of dc fields via the ancillary qubit for transverse field sensing.
- Quantum lock-in detection for low-frequency noise rejection.
- Ramsey detection for longitudinal field sensing.
Main Results:
- Demonstration of vector magnetometry for static fields using the hybrid platform.
- Successful frequency up-conversion enabling sensitive transverse field detection.
- Combined approach provides sensitive vector dc magnetometry at the nanoscale.
Conclusions:
- The hybrid magnetometry platform enables sensitive nanoscale vector magnetometry.
- Frequency up-conversion and quantum lock-in detection improve noise rejection and sensitivity.
- This technique offers a significant advancement for applications requiring precise magnetic field measurements.
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