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

Abstract

We 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.

11 pages, 12 figures, two columns, RevTex4; v2: published version

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• Long-distance dissipation-assisted transport of entangled states via a chiral waveguide
• Perturbatively-perfect many-body transfer
• Quantum transfer of interacting qubits
• Almost perfect transmission of multipartite entanglement through disordered and noisy spin chains
• Multipartite entanglement transfer in spin chains
• Photonic Newton's Cradle for Remote Energy Transport
• Robust and efficient transport of two-qubit entanglement via disordered spin chains
• Quantum Corralling
• Two-excitation routing via linear quantum channels
• Barenco gate implementation using driven two- and three-qubit spin chains