Scalable Fault-Tolerant Quantum Technologies with Silicon Colour Centres

TL;DR

This paper proposes a silicon-based quantum architecture using colour centres for scalable, fault-tolerant quantum computing and networking, leveraging high connectivity and low-overhead error correction to overcome current scaling barriers.

Contribution

It introduces a novel silicon photonic platform with T centres enabling scalable, fault-tolerant quantum processing and networking in a unified architecture.

Findings

High connectivity enables efficient quantum error correction.

Silicon T centres facilitate manufacturability and high-fidelity processing.

The architecture accelerates development of scalable quantum repeaters and processors.

Abstract

The scaling barriers currently faced by both quantum networking and quantum computing technologies ultimately amount to the same core challenge of distributing high-quality entanglement at scale. In this Perspective, a novel quantum information processing architecture based on optically active spins in silicon is proposed that offers a combined single technological platform for scalable fault-tolerant quantum computing and networking. The architecture is optimized for overall entanglement distribution and leverages colour centre spins in silicon (T centres) for their manufacturability, photonic interface, and high fidelity information processing properties. Silicon nanophotonic optical circuits allow for photonic links between T centres, which are networked via telecom-band optical photons in a highly-connected graph. This high connectivity unlocks the use of low-overhead quantum error correction codes, significantly accelerating the timeline for modular, scalable fault-tolerant quantum repeaters and quantum processors.