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• W3103607407 abstract "One of the biggest challenges impeding the progress of metal-oxide-silicon (MOS) quantum dot devices is the presence of disorder at the Si/SiO2 interface which interferes with controllably confining single and few electrons. In this work, we have engineered a low-disorder MOS quantum double-dot device with critical electron densities, i.e., the lowest electron density required to support a conducting pathway, approaching critical electron densities reported in high quality Si/SiGe devices and commensurate with the lowest critical densities reported in any MOS device. Utilizing a nearby charge sensor, we show that the device can be tuned to the single-electron regime where charging energies of ≈8 meV are measured in both dots, consistent with the lithographic size of the dot. Probing a wide voltage range with our quantum dots and charge sensor, we detect three distinct electron traps, corresponding to a defect density consistent with the ensemble measured critical density. Low frequency charge noise measurements at 300 mK indicate a 1/f noise spectrum of 3.4 μeV/Hz1∕2 at 1 Hz and magnetospectroscopy measurements yield a valley splitting of 110 ± 26 μeV. This work demonstrates that reproducible MOS spin qubits are feasible and represent a platform for scaling to larger qubit systems in MOS." @default.
• W3103607407 created "2020-11-23" @default.
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• W3103607407 date "2019-01-28" @default.
• W3103607407 modified "2023-10-17" @default.
• W3103607407 title "A low-disorder metal-oxide-silicon double quantum dot" @default.
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• W3103607407 doi "https://doi.org/10.1063/1.5075486" @default.
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