  The transfer and storage of quantum information in a hybrid quantum system,
consisting of an ensemble of atoms or spins interacting with a cavity, is
adversely affected by the inhomogeneity of the spins, which negates the
coherent exchange of excitations between the physical components. Using a full
quantum treatment based on variational renormalization group, we show how
quantum information encoded in the states of a parametrically driven hybrid
system is strongly protected against any decoherence that may arise due to the
inhomogeneity in the spin-ensemble.
