  For a double quantum dot system in a parallel geometry, we demonstrate that
by combining the effects of a flux and driving an electrical current through
the structure, the spin correlations between electrons localized in the dots
can be controlled at will. In particular, a current can induce spin
correlations even if the spins are uncorrelated in the initial equilibrium
state. Therefore, we are able to engineer an entangled state in this double-dot
structure. We take many-body correlations fully into account by simulating the
real-time dynamics using the time-dependent density matrix renormalization
group method. Using a canonical transformation, we provide an intuitive
explanation for our results, related to Ruderman-Kittel-Kasuya-Yoshida physics
driven by the bias.
