Freezing distributed entanglement in spin chains
Irene D’Amico, Brendon W. Lovett, Timothy P. Spiller · Physical Review A · 2007
We show how to freeze distributed entanglement that has been created from the natural dynamics of spin chain systems. The technique that we propose simply requires single-qubit operations and isolates the entanglement in specific qubits at the ends of branches. Such frozen entanglement provides a useful resource, for example for teleportation or distributed quantum processing. The scheme can be applied to a wide range of systems---including actual spin systems and alternative qubit embodiments in strings of quantum dots, molecules, or atoms.