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The main limitation to the high-fidelity quantum control of spins insemiconductors is the presence of strongly fluctuating fields arising from thenuclear spin bath of the host material. We demonstrate here a substantialimprovement in single-qubit gate fidelities for an electron spin qubit bound toa $^{31}$P atom in natural silicon, by applying adiabatic inversion instead ofnarrow-band pulses. We achieve an inversion fidelity of 97%, and we observesignatures in the spin resonance spectra and the spin coherence time that areconsistent with the presence of an additional exchange-coupled donor. This workhighlights the effectiveness of adiabatic inversion techniques for spin controlin fluctuating environments.

High-fidelity adiabatic inversion of a $^{31}\mathrm{P}$ electron spin qubit in natural silicon