Shuttling a single charge across a one-dimensional array of silicon quantum dots

Area of Science:

• Quantum computing
• Solid-state physics
• Nanotechnology

Background:

• Silicon spin qubits show high fidelity for fault-tolerant quantum computing.
• Limited connectivity in current silicon qubit architectures hinders scalability.
• Quantum state transfer beyond nearest-neighbor interactions is crucial for advanced quantum registers.

Purpose of the Study:

• To develop a scalable method for quantum state transfer in silicon quantum dot arrays.
• To overcome the limitations of nearest-neighbor connectivity in silicon spin qubits.
• To demonstrate the physical transport of single electrons across a large array.

Main Methods:

• Demonstrated shuttling of single electrons across a linear array of nine series-coupled silicon quantum dots.
• Utilized pairwise interdot charge transfers for electron transport.
• Employed complex pulse sequences for parallel shuttling of multiple electrons.

Main Results:

• Achieved electron shuttling in approximately 50 nanoseconds.
• Successfully demonstrated parallel shuttling of two and three electrons.
• Validated a scalable approach for physical transport of single electrons in silicon.

Conclusions:

• The developed electron shuttling technique provides a scalable solution for quantum state transfer in silicon.
• This method enhances connectivity in silicon quantum dot arrays, moving beyond nearest-neighbor limitations.
• Enables the construction of larger, more complex silicon-based quantum registers for quantum information processing.