  The transfer of an unknown quantum state, from a sender to a receiver, is one
of the main requirements to perform quantum information processing tasks. In
this respect, the state transfer of a single qubit by means of spin chains has
been widely discussed, and many protocols aiming at performing this task have
been proposed. Nevertheless, the state transfer of more than one qubit has not
been properly addressed so far. In this paper, we present a modified version of
a recently proposed quantum state transfer protocol [Phys. Rev. A 87, 062309
(2013)] to obtain a quantum channel for the transfer of two qubits. This goal
is achieved by exploiting Rabi-like oscillations due to excitations induced by
means of strong and localized magnetic fields. We derive exact analytical
formulae for the fidelity of the quantum state transfer, and obtain a
high-quality transfer for general quantum states as well as for specific
classes of states relevant for quantum information processing.
