Quantum Computing with Electron Spins in Quantum Dots
Abstract
We present a set of concrete and realistic ideas for the implementation of a small-scale quantum computer using electron spins in lateral GaAs/AlGaAs quantum dots. Initialization is based on leads in the quantum Hall regime with tunable spin-polarization. Read-out hinges on spin-to-charge conversion via spin-selective tunneling to or from the leads, followed by measurement of the number of electron charges on the dot via a charge detector. Single-qubit manipulation relies on a microfabricated wire located close to the quantum dot, and two-qubit interactions are controlled via the tunnel barrier connecting the respective quantum dots. Based on these ideas, we have begun a series of experiments in order to demonstrate unitary control and to measure the coherence time of individual electron spins in quantum dots.
Cite
@article{arxiv.quant-ph/0207059,
title = {Quantum Computing with Electron Spins in Quantum Dots},
author = {L. M. K. Vandersypen and R. Hanson and L. H. Willems van Beveren and J. M. Elzerman and J. S. Greidanus and S. De Franceschi and L. P. Kouwenhoven},
journal= {arXiv preprint arXiv:quant-ph/0207059},
year = {2007}
}
Comments
to be published in "Quantum Computing and Quantum Bits in Mesoscopic Systems", Kluwer Academic Plenum Publishers (due Dec. 2002)