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Buried nanomagnet realizing high-speed/low-variability silicon spin qubits: implementable in error-correctable large-scale quantum computers

A proposed buried nanomagnet (BNM) realizing highspeed/low-variability silicon spin qubit operation, inspired by buried wiring technology, could pave the way to practical large-scale quantum computers with silicon.

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Abstract:
“We propose a buried nanomagnet (BNM) realizing highspeed/low-variability silicon spin qubit operation, inspired by buried wiring technology, for the first time. High-speed quantum-gate operation results from large slanting magnetic-field generated by the BNM disposed quite close to a spin qubit, and low-variation of fidelity thanks to the self-aligned fabrication process. Employing TCAD-based simulation, we demonstrate that the BNM realizes 10 times faster Rabi oscillation (faster spin-flip) than previous works and >99% fidelity under certain process variations. Also, the proposed BNM arrangement is implementable for error-correctable large-scale quantum computers employing a 2D-latticed qubit layout. This technology paves the way to practical large-scale quantum computers with silicon.”

Find technical paper link here.  Presented at the 2021 Symposium on VLSI Technology in June 2021.

S. Iizuka et al., “Buried nanomagnet realizing high-speed/low-variability silicon spin qubits: implementable in error-correctable large-scale quantum computers,” 2021 Symposium on VLSI Technology, 2021, pp. 1-2.



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