Almost perfect transport of an entangled two-qubit state through a spin chain

Publication date: Available online 18 July 2018Source: Physics Letters AAuthor(s): Rafael Vieira, Gustavo RigolinAbstractWe show that using a slightly modified XX model for a spin-1/2 chain, one can transmit almost perfectly a maximally entangled two-qubit state from one end of the chain to the other one. This is accomplished without external fields or modulation of the coupling constants among the qubits. We also show that this strategy works for any size of the chain and is relatively robust to imperfections in the coupling constants among the qubits belonging to the chain. Actually, under certain scenarios of small disorder, we obtain better results than those predicted by the optimal ordered and noiseless case.

Source: Physics Letters A - July 19, 2018 Category: Physics Source Type: research