We study entanglement of charge qubits in a vertical tunnel-coupled double quantum dot containing two interacting electrons. Exact diagonalization is used to compute the negativity characterizing entanglement. We find that entanglement can be efficiently generated and controlled by sidegate voltages, and describe how it can be detected. For large enough tunnel coupling, the negativity shows a pronounced maximum at an intermediate interaction strength within the Wigner molecule regime.
@article{arxiv.cond-mat/0601699,
title = {Charge qubit entanglement in double quantum dots},
author = {S. Weiss and M. Thorwart and R. Egger},
journal= {arXiv preprint arXiv:cond-mat/0601699},
year = {2007}
}
Comments
revised version of the manuscript, as published in EPL, 7 pages, 4 figures