Quantum computing has long faced a steep scalability challenge: building systems with enough stable qubits for real-world advantage, while managing extreme cooling requirements and enormous overhead for error correction. New research outlines two complementary breakthroughs that could dramatically accelerate progress.
One approach enables connecting multiple quantum processors across separate dilution refrigerators via optical links, allowing distributed scaling instead of cramming everything into a single cryogenic setup. The other, from Caltech and collaborators (including insights from ETH Zurich on neutral-atom platforms), shows that useful fault-tolerant quantum computers could require far fewer qubits than previously thought—around 10,000–20,000 instead of millions. This is achieved through highly efficient error correction, where a logical qubit might need as few as ~5 physical qubits (versus hundreds or thousands in traditional schemes).
These advances lower engineering complexity, reduce costs, shrink timelines, and make commercially relevant quantum systems more feasible in the coming years. They shift the focus from raw qubit counts to practical capability.
Learn more: Read the full article on the scalability breakthroughs