Stabilizing Wall States to Protect Quantum Information

A new approach to the decoupling of quantum information from undesired environmental interactions is proposed, based on the preparation and stabilization of particular "wall" states on the interface between the system of interest and the environment. These states can be selected by minimizing the purity loss of the system of interest or by identifying the dominant interaction couplings. The effectiveness of the method is discussed with numerical simulations for paradigmatic systems and different ways to stabilize the wall state. Some promising features of stabilization via strong Hamiltonian driving are highlighted in the examples.