Quantum energy teleportation

Quantum energy teleportation (QET) is an application of quantum information science. It is a variation of the quantum teleportation protocol. Quantum energy teleportation allows energy to be teleported from a sender to a receiver, regardless of location. This protocol works by having the sender inject energy into the quantum vacuum state which the receiver can then extract positive energy from.^[1] QET differs from quantum teleportation as instead of information about an unknown state being teleported from a sender to a receiver, energy is transferred instead.

This procedure does not allow faster-than-light transfer of energy and does not allow the spontaneous creation of energy. The sender and receiver share a pair of entangled spins in a spin chain. Energy can be teleported from the sender, Alice, to the receiver, Bob, instantly by using the effects of local operators. However, in order for Bob to extract this energy from his spin he requires a classically communicated signal from Alice. Since this classical signal cannot be transmitted faster than the speed of light, the speed at which energy can be transferred from Alice to Bob is also limited by the speed of light.^[1]

Quantum energy teleportation was first proposed conceptually by Masahiro Hotta in 2008.^[1] The protocol was first experimentally demonstrated in 2023 by Kazuki Ikeda who used superconducting quantum computers to show the energy teleportation effect.^[2]