Temperature Fluctuations Compensation with Multi-Frequency Synchronous Manipulation for a NV Magnetometer in...

Area of Science:

• Quantum Sensing
• Solid-State Physics
• Optics

Background:

• Nitrogen-vacancy (NV) centers in diamonds are crucial for quantum sensing applications.
• Temperature fluctuations in the environment and measurement system interfere with NV center magnetic field measurements.
• Fiber-optic NV magnetometers face challenges due to temperature sensitivity.

Purpose of the Study:

• To develop a method for compensating temperature fluctuations in fiber-optic NV magnetometers.
• To analyze the temperature sensitivity of different diamonds and system-generated noise.
• To improve the practicality and accuracy of NV magnetometers in real-world applications.

Main Methods:

• A homemade NV magnetometer in a fiber-optic scheme was utilized.
• Temperature-sensitive characteristics of diamonds and system noise were analyzed.
• A multi-frequency synchronous manipulation method was proposed and tested to resonate with NV centers in all axial directions.

Main Results:

• The multi-frequency method effectively compensated for common-mode fluctuations, including temperature variations.
• Fluorescence change due to temperature fluctuations was reduced from 5.5% to 1.0% within a ±2 °C range.
• Improved fluorescence contrast and magnetic field measurement signal-to-noise ratio (SNR) were achieved through omnidirectional manipulation.

Conclusions:

• Compensating for temperature fluctuations is critical for the practical application of fiber-optic NV magnetometers.
• The multi-frequency synchronous manipulation method enhances the reliability and performance of NV-based quantum sensing.
• This work facilitates the advancement and broader adoption of quantum sensing technologies.