Journal
JOURNAL OF APPLIED PHYSICS
Volume 117, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4921291
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- Alfried Krupp von Bohlen und Halbach Foundation, DFG [BL 1197/2-1]
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High-fidelity control and unprecedented long dephasing times in silicon-based single spin qubits have recently confirmed the prospects of solid-state quantum computation. We investigate the feasibility of using a micro-magnet stray field for all-electrical, addressable spin qubit control in a Si/SiGe double quantum dot. For a micro-magnet geometry optimized for high Rabi-frequency, addressability, and robustness to fabrication misalignment as previously demonstrated by Yoneda et al. [Phys. Rev. Lett. 113, 267601 (2014)], we simulate the qubit decoherence due to magnetic stray-field fluctuations, which may dominate in nuclear spin-free systems, e.g., quantum dots in Si/SiGe, Si-MOS structures and (bilayer) graphene. With calculated Rabi-frequencies of 15 MHz, a qubit addressability error below 10(-3) is achievable. Magnetic fluctuations from a micro-magnet limits the spin relaxation time to T-1 greater than or similar to 3 s, while pure spin dephasing is negligible. Our results show that micro-magnets are a promising tool for spin qubit computation in nuclear spin-free systems. (C) 2015 AIP Publishing LLC.
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