  This Technical Review collects values of selected performance characteristics
of semiconductor spin qubits defined in electrically controlled nanostructures.
The characteristics are envisioned to serve as a community source for the
values of figures of merit with agreed-on definitions allowing the comparison
of different spin qubit platforms. We include characteristics on the qubit
coherence, speed, fidelity, and the qubit-size of multiqubit devices. The focus
is on collecting and curating the values of these characteristics as reported
in the literature, rather than on their motivation or significance.
