  A comparison of gate fidelities between different spin qubit types defined in
quantum dots and a donor under different control errors is reported. We studied
five qubit types, namely the quantum dot spin qubit, the double quantum dot
singlet-triplet qubit, the double quantum dot hybrid qubit, the donor qubit and
the quantum dot spin-donor qubit. For each one, we derived analytical time
sequences that realize single qubit rotations along the principal axis of the
Bloch sphere. We estimated the effects of control errors on the gate fidelity
by using a Gaussian noise model. Then we compared the gate fidelities among
qubit implementations due to pulse timing errors by using a realistic set of
values for the error parameters of control amplitudes.
