Efficient, uniform, and large area microwave magnetic coupling to NV centers in diamond using double split-ring...

Area of Science:

• Quantum sensing and metrology
• Diamond quantum technologies
• Microwave engineering for quantum systems

Background:

• Nitrogen-vacancy (NV) centers in diamond are promising solid-state qubits for quantum sensing.
• Efficient and uniform delivery of microwave magnetic fields is critical for controlling NV centers over large areas.
• Existing methods often struggle with uniformity and scalability for practical applications.

Purpose of the Study:

• To develop and demonstrate a novel double split-ring resonator for enhanced microwave field coupling.
• To achieve uniform microwave magnetic field generation over a millimeter-squared area for NV centers.
• To characterize the performance of the resonator using Rabi nutation experiments.

Main Methods:

• Fabrication of a double split-ring microwave resonator.
• Utilization of Rabi nutation experiments on ensemble nitrogen-vacancy (NV) centers in diamond nanowires.
• Measurement of Rabi nutation frequency to assess microwave field uniformity and magnitude.

Main Results:

• Demonstrated uniform microwave magnetic field coupling to NV centers over a 0.95 × 1.2 mm² area.
• Achieved an average Rabi nutation frequency of 15.65 MHz at 0.5 W input power.
• Determined an average magnetic field of 5.59 G with a standard deviation of 0.24 G over the target area.

Conclusions:

• The developed double split-ring resonator enables highly uniform and efficient microwave magnetic field delivery to NV centers.
• This advancement is significant for scalable quantum sensing and quantum information processing applications.
• The system provides a reliable platform for precise magnetic field measurements using diamond NV centers.