  Due to the strong spin-orbit interaction in indium antimonide, orbital motion
and spin are no longer separated. This enables fast manipulation of qubit
states by means of microwave electric fields. We report Rabi oscillation
frequencies exceeding 100 MHz for spin-orbit qubits in InSb nanowires.
Individual qubits can be selectively addressed due to intrinsic dierences in
their g-factors. Based on Ramsey fringe measurements, we extract a coherence
time T_2* = 8 +/- 1 ns at a driving frequency of 18.65 GHz. Applying a Hahn
echo sequence extends this coherence time to 35 ns.
