Coherent Operations and Screening in Multielectron Spin Qubits

Andrew Patrick Higginbotham, Ferdinand Kuemmeth, M.P. Hanson, A.C. Gossard, Charles M. Marcus

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Abstract

Multielectron spin qubits are demonstrated, and performance examined by comparing coherent exchange oscillations in coupled single-electron and multielectron quantum dots, measured in the same device. Fast (>1 GHz) exchange oscillations with a quality factor Q ∼ 15 are found for the multielectron case, compared to Q ∼ 2 for the single-electron case, the latter consistent with experiments in the literature. A model of dephasing that includes voltage and hyperfine noise is developed that is in good agreement with both single- and multielectron data, though in both cases additional exchange-independent dephasing is needed to obtain quantitative agreement across a broad parameter range.
Original languageEnglish
Article number026801
JournalPhysical Review Letters
Volume112
Number of pages5
ISSN0031-9007
DOIs
Publication statusPublished - 14 Jan 2014

Bibliographical note

preprint can be found at http://arxiv.org/abs/1306.2720

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