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We study the quality of state and entanglement transmission through quantumchannels described by spin chains varying both the system parameters and theinitial state of the channel. We consider a vast class of one-dimensionalmany-body models which contains some of the most relevant experimentalrealizations of quantum data-buses. In particular, we consider spin-1/2 XY andXXZ model with open boundary conditions. Our results show a significantdifference between free-fermionic (non-interacting) systems (XY) andinteracting ones (XXZ), where in the former case initialization can beexploited for improving the entanglement distribution, while in the latter caseit also determines the quality of state transmission. In fact, we find that innon interacting systems the exchange with fermions in the initial state of thechain always has a destructive effect, and we prove that it can be completelyremoved in the isotropic XX model by initializing the chain in a ferromagneticstate. On the other hand, in interacting systems constructive effects can ariseby scattering between hopping fermions and a proper initialization procedure.Remarkably our results are the first example in which state and entanglementtransmission show maxima at different points as the interactions andinitializations of spin chain channels are varied.

Initializing an unmodulated spin chain to operate as a high quality quantum data-bus