In the quest for purer silicon for quantum computing, researchers in England have developed a method to eliminate disruptive isotopes in silicon that interfere with qubit states. By focusing on purifying only the regions used by qubits, they use a focused ion beam to replace unwanted silicon-29 with silicon-28. This innovative approach results in silicon samples with significantly fewer impurities than natural silicon. This process is not only more efficient and scalable but also avoids introducing additional contaminants. The potential for this technology to be integrated into industrial processes could pave the way for the scalability of silicon-based quantum computing to millions of qubits.
https://spectrum.ieee.org/silicon-quantum-computing-purified-si