A lateral quantum dot design for coherent electrical manipulation of a two-level spin-charge system is presented. Two micron-size permanent magnets integrated to high-frequency electrodes produce a static slanting magnetic field suitable for voltage controlled single qubit gate operations. Stray field deviation from the slanting form is taken into account in the Hamiltonian describing the two-level system, which involves hybridization of a single electron spin to the quantum dot's orbitals. Operation speed and gate fidelity are related to device parameters. Sub 100 ns π pulse duration can be achieved with lattice fluctuations coherence time of 4 ms for GaAs.
@article{arxiv.cond-mat/0612314,
title = {Micro-magnets for coherent control of spin-charge qubit in lateral quantum dots},
author = {M. Pioro-Ladriere and Y. Tokura and T. Obata and T. Kubo and S. Tarucha},
journal= {arXiv preprint arXiv:cond-mat/0612314},
year = {2015}
}
Comments
4 pages, 2 figures. Accepted for publication in App. Phys. Lett