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A flexible 300 mm integrated Si MOS platform for electron- and hole-spin qubits exploration
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We report on a flexible 300 mm process that optimally combines optical and electron beam lithography to fabricate silicon spin qubits. It enables on-the-fly layout design modifications while allowing devices with either n- or p-type ohmic implants, a pitch smaller than 100 nm, and uniform critical dimensions down to 30 nm with a standard deviation ~ 1.6 nm. Various n- and p-type qubits are characterized in a dilution refrigerator at temperatures ~ 10 mK. Electrical measurements demonstrate well-defined quantum dots, tunable tunnel couplings, and coherent spin control, which are essential requirements for the implementation of a large-scale quantum processor.
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Eight-Qubit Operation of a 300 mm SiMOS Foundry-Fabricated Device
Eight silicon spin qubits in a 300-mm CMOS foundry device were tuned and characterized, with Ramsey dephasing up to 41 μs and Hahn-echo coherence up to 1.31 ms.
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