How to Build a Quantum Supercomputer: Scaling from Hundreds to Millions of Qubits | Quantum Colloquium

In the span of four decades, quantum computation has evolved from an intellectual curiosity to a potentially realizable technology. Today, small-scale demonstrations have become possible on hundreds of physical qubits and proof-of-principle error-correction on a single logical qubit. Nevertheless, the path toward a full-stack scalable technology is largely unknown. There are significant outstanding quantum hardware, fabrication, software architecture, and algorithmic challenges that are either unresolved or overlooked. Here, we show how the road to scaling could be paved by adopting existing semiconductor technology to build much higher-quality qubits and employing system engineering approaches.