Nanosecond-timescale spin transfer using individual electrons in a quadruple-quantum-dot device

Journal article (2016)

Authors

T.A. Baart QCD/Vandersypen Lab - QuTech Advanced Research Centre , QuTech Advanced Research Centre, Kavli institute of nanoscience Delft
N. Jovanovic Kavli institute of nanoscience Delft, QuTech Advanced Research Centre, Applied Probability - EEMCS
C. Reichl ETH Zürich
W. Wegscheider ETH Zürich
L.M.K. Vandersypen QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, QCD/Vandersypen Lab - QuTech Advanced Research Centre
Research Group
QCD/Vandersypen Lab (QuTech Advanced Research Centre) (TU Delft)
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Published Date

2016

Language

English

Faculty

QuTech Advanced Research Centre

Department

Quantum Computing Division

Research Group

QCD/Vandersypen Lab

Abstract

The ability to coherently transport electron-spin states between different sites of gate-defined semiconductor quantum dots is an essential ingredient for a quantum-dot-based quantum computer. Previous shuttles using electrostatic gating were too slow to move an electron within the spin dephasing time across an array. Here, we report a nanosecond-timescale spin transfer of individual electrons across a quadruple-quantum-dot device. Utilizing enhanced relaxation rates at a so-called hot spot, we can upper bound the shuttle time to at most 150 ns. While actual shuttle times are likely shorter, 150 ns is already fast enough to preserve spin coherence in, e.g., silicon based quantum dots. This work therefore realizes an important prerequisite for coherent spin transfer in quantum dot arrays.