Ground-State Entanglement Bound for Quantum Energy Teleportation of General Spin-Chain Models

Understand

Many-body quantum systems in the ground states have zero-point energy due to the uncertainty relation.

• In many cases, the system in the ground state accompanies spatially-entangled energy density fluctuation via the noncommutativity of the energy density operators, though the total energy takes a fixed value, i.e.
• the lowest eigenvalue of the Hamiltonian.
• Quantum energy teleportation (QET) is protocols for extraction of the zero-point energy out of one subsystem using information of a remote measurement of another subsystem.