China has started mass-producing ultra-pure silicon-28, a key material for building stable quantum computers, in a move that strengthens the country's technological independence and deepens the rivalry with the United States over advanced chips and computing.
A material essential for stable qubits
Ultra-pure silicon-28 is a specially refined form of silicon that contains almost no nuclear spins — atomic-scale magnetic noise that can corrupt quantum bits, or qubits. By removing the silicon-29 isotope that causes interference, the material allows qubits to maintain their quantum states longer, a critical requirement for building practical quantum computers. Until now, only a handful of labs worldwide could produce small batches of the material. China's ability to scale up production changes the dynamic.
Why self-reliance matters
Chinese researchers have long relied on imports of high-purity silicon isotopes, often from US or European suppliers. With mass production now underway, Beijing reduces its dependence on foreign sources for a material seen as strategic to next-generation computing. The development aligns with broader state-led efforts to secure supply chains for critical technologies, including semiconductors and rare-earth metals. Officials have not disclosed production volumes or the identity of the facility involved, but the project is believed to be backed by the Chinese Academy of Sciences.
Supply chain shake-up
The shift affects global supply chains for quantum computing materials. Producers in the US and Europe that previously supplied small quantities of ultra-pure silicon-28 now face a large-scale competitor. Companies developing quantum processors will have another sourcing option, potentially lowering costs. But the change also raises concerns about export controls: if China restricts overseas sales of the material, foreign firms could struggle to secure enough supply for their own research. The US government has already tightened export rules on quantum-related technologies, and this development may trigger further restrictions.
The next front in tech competition
The mass production milestone marks quantum computing as the newest battleground in US-China technology rivalry. Washington has invested billions through the National Quantum Initiative Act, while Beijing has made quantum a pillar of its five-year plans. Each side sees quantum computers as a future tool for code-breaking, drug discovery, and advanced materials design. The ability to produce key building blocks domestically gives China a strategic advantage in a race where first-mover benefits are enormous.
No timeline has been set for when any potential export controls on silicon-28 might take effect, but US policymakers are expected to review the situation in the coming weeks.
