Useful quantum computers could be built with as few as 10,000 qubits, team finds

A Caltech-led team, including startup Oratomic, has slashed the qubit requirement for practical quantum computers from millions to just 10,000–20,000, potentially accelerating real-world deployment by the late 2020s. The breakthrough combines theoretical and experimental advances to drastically reduce error rates, the primary barrier to scalable quantum computing, by optimizing qubit architecture and error correction protocols. Previous estimates demanded millions of physical qubits to compensate for errors, but the new method achieves fault tolerance with far fewer, lowering hardware complexity and cost barriers. This research suggests useful quantum computers—capable of solving classically intractable problems—could emerge within a decade, provided engineering challenges in qubit stability and control are overcome. The collaboration highlights how academic-industry partnerships are fast-tracking quantum progress, shifting focus from theoretical limits to near-term, achievable milestones.