In a four-site spin model, positive energy extraction in a quantum energy teleportation protocol occurs when h times a nonlocal Majorana correlator D_AB is nonzero, with maximum extracted energy sqrt(epsilon_B^2 + (h D_AB)^2) - |epsilon_B|.
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Nonlocal correlations in quantum energy teleportation: perspectives from their Majorana representations and information thermodynamics
In a four-site spin model, positive energy extraction in a quantum energy teleportation protocol occurs when h times a nonlocal Majorana correlator D_AB is nonzero, with maximum extracted energy sqrt(epsilon_B^2 + (h D_AB)^2) - |epsilon_B|.