Fiber-coupled silicon carbide divacancy magnetometer and thermometer

Area of Science:

• Quantum sensing
• Solid-state physics
• Quantum metrology

Background:

• Divacancy defects in silicon carbide (SiC) are promising solid-state systems for quantum applications.
• Existing quantum sensors often lack portability and multi-functionality.

Purpose of the Study:

• To develop a compact, fiber-coupled quantum sensor based on silicon carbide divacancies.
• To achieve simultaneous measurement of magnetic fields and temperature using a single device.

Main Methods:

• Efficient fiber coupling to divacancy defects in a silicon carbide slice.
• Optimization of optically detected magnetic resonance (ODMR) for enhanced magnetic field sensitivity.
• Utilizing Ramsey interferometry for precise temperature sensing.

Main Results:

• Achieved a magnetic field sensitivity of 3.9 μT/Hz^1/2.
• Demonstrated temperature sensing with a sensitivity of 163.2 mK/Hz^1/2.
• Successfully integrated divacancy sensing into a fiber-coupled platform.

Conclusions:

• The developed fiber-coupled divacancy sensor enables simultaneous, high-sensitivity quantum measurements.
• This technology offers a versatile platform for practical quantum sensing in various environments.
• The compact and robust design enhances the potential for real-world applications.