Suppression of nuclear spin bath fluctuations in self-assembled quantum dots induced by inhomogeneous strain

E.A. Chekhovich (), M. Hopkinson, M.S. Skolnick and A.I. Tartakovskii
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E.A. Chekhovich: University of Sheffield
M. Hopkinson: University of Sheffield
M.S. Skolnick: University of Sheffield
A.I. Tartakovskii: University of Sheffield

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Interaction with nuclear spins leads to decoherence and information loss in solid-state electron-spin qubits. One particular, ineradicable source of electron decoherence arises from decoherence of the nuclear spin bath, driven by nuclear–nuclear dipolar interactions. Owing to its many-body nature nuclear decoherence is difficult to predict, especially for an important class of strained nanostructures where nuclear quadrupolar effects have a significant but largely unknown impact. Here, we report direct measurement of nuclear spin bath coherence in individual self-assembled InGaAs/GaAs quantum dots: spin-echo coherence times in the range 1.2–4.5 ms are found. Based on these values, we demonstrate that strain-induced quadrupolar interactions make nuclear spin fluctuations much slower compared with lattice-matched GaAs/AlGaAs structures. Our findings demonstrate that quadrupolar effects can potentially be used to engineer optically active III-V semiconductor spin-qubits with a nearly noise-free nuclear spin bath, previously achievable only in nuclear spin-0 semiconductors, where qubit network interconnection and scaling are challenging.

Date: 2015
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DOI: 10.1038/ncomms7348

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