Unmodulated spin chains as universal quantum wires (3 pages)

Vahid Karimipour, Abolfazl Bayat

V. Subrahmanyam

Jill C. Bonner, Henk W. J. Blöte, Hans Beck +1 more

Antoni Wójcik, Tomasz Łuczak, Paweł Kurzyński +3 more

We study a quantum state transfer between two qubits interacting with the ends of a quantum wire consisting of linearly arranged spins coupled by an excitation conserving, time-independent Hamiltonian. We show that, if we control the coupling between the source and the destination qubits and the ends of the wire, the evolution of the system can lead to an almost perfect transfer even in the case in which all nearest-neighbour couplings between the internal spins of the wire are equal.

G. Benfatto, V. Mastropietro

Jie Ren, Shiqun Zhu

A teleportation scheme between two arbitrary locations is introduced. The locations only need to establish a quantum wire to a super-location. The super-location can create and transfer Bell states by two unmodulated and coupled spin chains or by two engineered spin chains. The entanglement of transferring the Bell state of [Formula: see text] is better than that of transferring state [Formula: see text].