  Leveraging the advanced manufacturing capabilities of the semiconductor
industry promises to help scale up silicon-based quantum processors by
increasing yield, uniformity and integration. Recent studies of quantum dots
fabricated on 300 mm wafer metal-oxide-semiconductor (MOS) processes have shown
control and readout of individual spin qubits, yet quantum processors require
two-qubit interactions to operate. Here, we use a 300 mm wafer MOS process
customized for spin qubits and demonstrate coherent control of two electron
spins using the spin-spin exchange interaction, forming the basis of an
entangling gate such as $\sqrt{\text{SWAP}}$. We observe gate dephasing times
of up to $T_2^{*}\approx500$ ns and a gate quality factor of 10. We further
extend the coherence by up to an order of magnitude using an echo sequence. For
readout, we introduce a dispersive readout technique, the radiofrequency
electron cascade, that amplifies the signal while retaining the spin-projective
nature of dispersive measurements. Our results demonstrate an industrial grade
platform for two-qubit operations, alongside integration with dispersive
sensing techniques.
