A theorem connects teleportation fidelity to concurrence of X-state channels; nonlocal broadcasting of entanglement produces superior channels for teleportation than local broadcasting, with all such inseparable states proven useful.
Sen (De), Current Science 112 (2017) 1361
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The use of the output states generated by the broadcasting of entanglement in quantum teleportation
A theorem connects teleportation fidelity to concurrence of X-state channels; nonlocal broadcasting of entanglement produces superior channels for teleportation than local broadcasting, with all such inseparable states proven useful.