Two-dimensional semiconductors pave the way towards dopant-based quantum computing.

Area of Science:

• Quantum computing
• Materials science
• Condensed matter physics

Background:

• Quantum computing proposals utilize dopants in silicon as qubits.
• Challenges exist in controlling exchange interactions and tunneling between dopants due to silicon's valley degeneracy.
• This oscillatory behavior complicates precise qubit control.

Purpose of the Study:

• Investigate two-dimensional (2D) materials as alternative hosts for donor qubits.
• Address challenges in controlling dopant interactions in quantum computing.
• Assess the feasibility of 2D materials for single and two-qubit operations.

Main Methods:

• Examined properties of available 2D semiconductor materials.
• Assessed quantum manipulability of isolated dopants for single qubit operations.
• Evaluated dopant pairs in 2D systems for two-qubit operations.

Main Results:

• Dopants in 2D systems are more tightly bound and easier to manipulate.
• Many 2D materials have conduction band minima at k=0, avoiding problematic exchange coupling oscillations.
• A variety of 2D materials show potential for donor qubit performance.

Conclusions:

• Two-dimensional materials present a promising alternative host for donor qubits.
• They offer potential advantages over traditional bulk silicon hosts for quantum computing.
• Further research into 2D materials could advance donor qubit technology.