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Coherence and Screening in Multi-Electron Spin Qubits

The performance of multi-electron spin qubits is examined by comparing exchange oscillations in coupled single-electron and multi-electron quantum dots in the same device. Fast (> 1 GHz) exchange oscillations with a quality factor Q > 15 are found for the multi-electron case, compared to Q ~ 2 for the single-electron case, the latter consistent with previous experiments. A model of dephasing that includes voltage and hyperfine noise is developed that is in good agreement with both single- and multi-electron data, though in both cases additional exchange-independent dephasing is needed to obtain quantitative agreement across a broad parameter range.

preprint2013arXivOpen access
A. P. HigginbothamF. KuemmethM. P. HansonA. C. GossardC. M. Marcus
cond-mat.mes-hallquant-ph
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A. P. HigginbothamF. KuemmethM. P. HansonA. C. GossardC. M. Marcus

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