In Australia, a team made a breakthrough in MOS-based quantum computers, with a 99 percent accurate two-qubit gate performance crucial for error correction. These computers can integrate with existing CMOS technology, making mass qubit production easier. Other companies use superconducting qubits, trapped ions, charged atoms, or photons. UNSW, Diraq, and collaborating groups trapped single electrons in MOS devices to create qubits like traditional transistors. They identified and controlled noise sources, such as isotopic impurities and electric field variations. Scaling to more qubits is challenging due to input/output channel needs, but Intel and Diraq are working on solutions. Diraq plans a partnership with Global Foundries to scale to thousands of qubits.
https://spectrum.ieee.org/qubit-transistor