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Title: Simulation of micro-magnet stray-field dynamics for spin qubit manipulation

Abstract

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{sup −3} is achievable. Magnetic fluctuations from a micro-magnet limits the spin relaxation time to T{sub 1} ≳ 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.

Authors:
;  [1]
  1. Quantum Technology Group, JARA-Institute for Quantum Information, RWTH Aachen University, 52056 Aachen (Germany)
Publication Date:
OSTI Identifier:
22410209
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 77 NANOSCIENCE AND NANOTECHNOLOGY; CALCULATION METHODS; FLUCTUATIONS; GERMANIUM SILICIDES; GRAPHENE; LAYERS; MAGNETS; MHZ RANGE; QUANTUM COMPUTERS; QUANTUM DOTS; QUBITS; RELAXATION TIME; SILICON; SILICON OXIDES; SOLIDS; SPIN

Citation Formats

Neumann, R., and Schreiber, L. R., E-mail: lars.schreiber@physik.rwth-aachen.de. Simulation of micro-magnet stray-field dynamics for spin qubit manipulation. United States: N. p., 2015. Web. doi:10.1063/1.4921291.
Neumann, R., & Schreiber, L. R., E-mail: lars.schreiber@physik.rwth-aachen.de. Simulation of micro-magnet stray-field dynamics for spin qubit manipulation. United States. doi:10.1063/1.4921291.
Neumann, R., and Schreiber, L. R., E-mail: lars.schreiber@physik.rwth-aachen.de. Thu . "Simulation of micro-magnet stray-field dynamics for spin qubit manipulation". United States. doi:10.1063/1.4921291.
@article{osti_22410209,
title = {Simulation of micro-magnet stray-field dynamics for spin qubit manipulation},
author = {Neumann, R. and Schreiber, L. R., E-mail: lars.schreiber@physik.rwth-aachen.de},
abstractNote = {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{sup −3} is achievable. Magnetic fluctuations from a micro-magnet limits the spin relaxation time to T{sub 1} ≳ 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.},
doi = {10.1063/1.4921291},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 19,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}