Designs for a two-dimensional Si quantum dot array with spin qubit addressability.

Area of Science:

• Quantum computing
• Solid-state physics
• Materials science

Background:

• Silicon (Si) electron spins are promising for quantum computation due to scalability and high-fidelity gates.
• Two-dimensional integration with efficient qubit connectivity is crucial for scaling quantum processors, but practical designs ensuring qubit addressability are lacking.

Purpose of the Study:

• To propose a practical 3x3 quantum dot device design for silicon quantum computing.
• To ensure qubit addressability and connectivity to nearest neighbors in a 2D array.
• To explore a novel structure for scaling beyond 3x3 arrays.

Main Methods:

• Device design of a 3x3 quantum dot array.
• Simulation of a four-qubit Grover's algorithm execution.
• Proposal of a novel structure with ferromagnetic gate electrodes for scalability.

Main Results:

• A 3x3 quantum dot array demonstrates efficient execution of a four-qubit Grover's algorithm compared to 1D arrays.
• The proposed design ensures qubit addressability and connectivity.
• A novel scalable design using ferromagnetic gate electrodes is introduced.

Conclusions:

• The proposed 3x3 quantum dot design is a practical step towards medium-sized silicon quantum processors.
• The novel scalable design offers a pathway for larger quantum computing architectures.
• These advancements pave the way for silicon quantum computers with fast gates and long coherence times.