  Scalability from single qubit operations to multi-qubit circuits for quantum
information processing requires architecture-specific implementations.
Semiconductor hybrid qubit architecture is a suitable candidate to realize
large scale quantum information processing, as it combines a universal set of
logic gates with fast and all-electrical manipulation of qubits. We propose an
implementation of hybrid qubits, based on Si Metal-Oxide-Semiconductor (MOS)
quantum dots, compatible with the CMOS industrial technologic standards. We
discuss the realization of multi-qubit circuits capable of fault-tolerant
computation and quantum error correction, by evaluating the time and space
resources needed for their implementation. As a result, the maximum density of
quantum information is extracted from a circuit including 8 logical qubits
encoded by the [[7,1,3]] Steane code. The corresponding surface density of
logical qubits is 2.6 Mqubit/cm$^2$.
