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In general, it is important to identify what is the informational resourcefor quantum tasks. Quantum energy teleportation (QET) is a quantum task, whichattains energy transfer in an operational meaning by local operations andclassical communication, and is expected to play a role in future developmentof nano scale smart grids. We consider QET protocols in a three-element Isingspin system with non periodic boundary conditions coupled to a thermal bath.The open chain is the minimal model of QET between two edge spins that allowsthe measurement and operation steps of the QET protocol to be optimized withoutrestriction. It is possible to analyze how two-body correlations of the system,like mutual information, entanglement and quantum discord, can be resources ofthis QET at each temperature. In particular, we stress that quantum discord isnot the QET resource in some cases even if arbitrary measurements andoperations are available.

Quantum Energy Teleportation across a three-spin Ising chain in a Gibbs State