Coherent Operations and Screening in Multielectron Spin Qubits
Research output: Contribution to journal › Journal article › Research › peer-review
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.
|Journal||Physical Review Letters|
|Number of pages||5|
|Publication status||Published - 14 Jan 2014|
preprint can be found at http://arxiv.org/abs/1306.2720