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|.
Quantum Energy Teleportation and Entropy Change due to Feedback Control in One-Dimensional Heisenberg Model
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abstract
We study the quantum energy teleportation in a four-spin one-dimensional Heisenberg model. A local magnetic field is applied at the edge sites to control the degree of the ground-state entanglement. In the teleportation protocol, an energy sender performs a projective measurement at one edge site, while an energy receiver performs a feedback control at the other edge site dependent on the measurement result to extract energy. We find that the energy extracted by the receiver takes a maximum at intermediate value of the local magnetic field. We also find that this magnetic-field behavior is almost proportional to entropy changes due to the feedback control. The role of a feedback control in an entropy change is discussed in terms of entanglement thermodynamics.
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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|.