Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 9, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4867905
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Funding
- Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology [CE110001027]
- US Army Research Office [W911NF-13-1-0024]
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The main limitation to the high-fidelity quantum control of spins in semiconductors is the presence of strongly fluctuating fields arising from the nuclear spin bath of the host material. We demonstrate here a substantial improvement in single-qubit inversion fidelities for an electron spin qubit bound to a P-31 atom in natural silicon, by applying adiabatic sweeps instead of narrow-band pulses. We achieve an inversion fidelity of 97%, and we observe signatures in the spin resonance spectra and the spin coherence time that are consistent with the presence of an additional exchange-coupled donor. This work highlights the effectiveness of simple adiabatic inversion techniques for spin control in fluctuating environments. (C) 2014 AIP Publishing LLC.
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