  We analyze, from a quantum information theory perspective, the possibility of
realizing a SU(4) entangled Kondo regime in semiconductor double quantum dot
devices. We focus our analysis on the ground state properties and consider the
general experimental situation where the coupling parameters of the two quantum
dots differ. We model each quantum dot with an Anderson type Hamiltonian
including an interdot Coulomb repulsion and tunnel couplings for each quantum
dot to independent fermionic baths. We find that the spin and pseudospin
entanglements can be made equal, and the SU(4) symmetry recovered, if the gate
voltages are chosen in such a way that the average charge occupancies of the
two quantum dots are equal, and the double occupancy on the double quantum dot
is suppressed. We present density matrix renormalization group numerical
results for the spin and pseudospin entanglement entropies, and analytical
results for a simplified model that captures the main physics of the problem.
