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In their author manuscript, Hotta and Ikeda propose a quantum-battery protocol that uses quantum energy teleportation to increase energy stored in a local subsystem. The protocol starts from an entangled highest-energy state of locally interacting spins, rather than the ground state used in conventional quantum energy teleportation. Alice measures her subsystem and sends the result through a classical channel; Bob uses that information to choose a local operation. In an analytical two-qubit model, this feedback raises Bob’s local energy above its initial value, with the classical comparison defined as maximum total energy divided by subsystem count. The authors identify scaling to larger systems and experimental validation on quantum devices as further research.

Exceeding the maximum classical energy density in fully charged quantum batteries