Sub-10 nm Precision Engineering of Solid-State Defects via Nanoscale Aperture Array Mask

Area of Science:

• Quantum physics
• Materials science
• Nanotechnology

Background:

• Scalable quantum systems require precisely engineered qubit clusters.
• Solid-state qubits, like nitrogen vacancy (NV) centers in diamond, face fabrication challenges for large-scale, strongly coupled systems at room temperature.

Purpose of the Study:

• To develop a precise method for generating NV color centers in diamond for scalable quantum applications.
• To investigate the effectiveness of nanoscale aperture arrays (NAAs) in controlling ion implantation for qubit fabrication.

Main Methods:

• Utilized a combination of high-aspect-ratio (10:1) nanoscale aperture arrays (NAAs) and electron-beam lithography.
• Employed an ion-blocking mask technique during ion implantation to achieve sub-10 nm precision.
• Conducted optical and spin measurements on fabricated NV spin clusters.

Main Results:

• Achieved sub-10 nm precision in generating nitrogen vacancy (NV) color centers in diamond.
• Demonstrated the effectiveness of NAAs in controlling ion implantation for precise defect positioning.
• Statistically analyzed the impact of NAAs on the ion-implantation process for NV center generation.

Conclusions:

• The developed NAA-based technique enables precise fabrication of NV color centers, crucial for scalable quantum systems.
• This method addresses key challenges in creating strongly coupled qubit registers at room temperature.
• The findings pave the way for advancing quantum sensing and node-based quantum computing architectures.