  The development of the first generation of commercial quantum computers is
based on superconductive qubits and trapped ions respectively. Other
technologies such as semiconductor quantum dots, neutral ions and photons could
in principle provide an alternative to achieve comparable results in the medium
term. It is relevant to evaluate if one or more of them is potentially more
effective to address scalability to millions of qubits in the long term, in
view of creating a universal quantum computer. We review an all-electrical
silicon spin qubit, that is the double quantum dot hybrid qubit, a quantum
technology which relies on both solid theoretical grounding on one side, and
massive fabrication technology of nanometric scale devices by the existing
silicon supply chain on the other.
