Tunable Non-local Spin Control in a Coupled Quantum Dot System
  The effective interaction between magnetic impurities in metals that can lead to various magnetic ground states often competes with a tendency for electrons near impurities to screen the local moment (Kondo effect). The simplest system exhibiting the richness of this competition, the two-impurity Kondo system, is here realized experimentally in the form of two quantum dots coupled through an open conducting region. We demonstrate non-local spin control by suppressing and splitting Kondo resonances in one quantum dot by changing electron number and coupling of the other dot. Results suggest an approach to non-local spin control relevant to quantum information processing. 
N. J. Craig, J. M. Taylor, E. A. Lester, C. M. Marcus, M. P. Hanson,   and A. C. Gossard