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Silicon spin qubits

Creating spin qubits for scalable quantum computers.

Overview

Spin qubits are one of the prospective types of qubit for future scalable quantum computers. However, reliable fabrication of these basic quantum elements is challenging and requires nearly perfect materials and nanometer precision owing to their small size and sensitivity to the electromagnetic environment. Silicon, which has been the material of choice for classical computing for many years, also has highly desirable properties for the fabrication of spin qubits.

Individually confined electron and hole spins in silicon-based quantum dots have been shown to have exceptionally long lifetimes, up to seconds or longer for electrons in isotopically purified 28Si. Thanks to the tremendous advancement of silicon technology in recent years, reliable fabrication of silicon quantum dots has come within reach. Some of the silicon transistor devices in the latest technology nodes can actually be used directly as spin qubits.

Individually confined electron and hole spins in silicon-based quantum dots have been shown to have exceptionally long lifetimes, up to seconds or longer for electrons in isotopically purified 28Si. Thanks to the tremendous advancement of silicon technology in recent years, reliable fabrication of silicon quantum dots has come within reach. Some of the silicon transistor devices in the latest technology nodes can actually be used directly as spin qubits.

Spin Qubit Technology

image of a 500 nanometer qubit processor
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We focus on the bulk silicon FinFET platform as a basic element for qubit implementation. In conjunction with silicide based ohmic contacts this platform allows implementation of both electron and hole spin qubits in the same devices simply by changing the applied gate voltages. Lateral confinement in the fin reduces the gate complexity and allows the use of self-alignment techniques for smaller and more tunable devices.