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Updated: May 3, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Coherent operations and screening in multielectron spin qubits
A P Higginbotham1, F Kuemmeth2, M P Hanson3
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA and Center for Quantum Devices, Niels Bohr Institute, 2100 Copenhagen, Denmark.
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.
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