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Confined electron spins are preferred candidates for embodying quantuminformation in the solid state. A popular idea is the use of optical excitationto achieve the ``best of both worlds'', i.e. marrying the long spin decoherencetimes with rapid gating. Here we study an all-optical adiabatic approach togenerating single qubit phase gates. We find that such a gate can be extremelyrobust against the combined effect of all principal sources of decoherence,with an achievable fidelity of 0.999 even at finite temperature. Crucially thisperformance can be obtained with only a small time cost: the adiabatic gateduration is within about an order of magnitude of a simple dynamicimplementation. An experimental verification of these predictions isimmediately feasible with only modest resources.

High fidelity all-optical control of quantum dot spins: detailed study of the adiabatic approach