Transport of Quantum Information Using Spin Wires

One-dimensional antiferromagnetically coupled spin systems have properties that make them useful as conduits for quantum information$_{ }$(PRL \textbf{90}, 047901 (2003)). Here we investigate possible mechanisms for using engineered spin chains as ``spin wires'' that can faithfully transport qubits. An analysis of the spin chains is carried out through numerical diagonalization of the effective spin Hamiltonian. We find that dimerized chains with a defect can support a highly localized qubit. We also demonstrate how it may be possible to propagate these kinks rapidly through a large system, thus providing a mechanism for producing ``flying'' spin qubits in the solid state.