Abstract. 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.

PACS numbers: 73.21.La, 03.65.Ud, 73.23.-b

Print publication: Issue 5 (December 2006)
Received 21 July 2006, in final form and accepted for publication 4 October 2006
Published 1 November 2006