I just read another sensationally titled article in Quanta magazine, Physicists Use Quantum Mechanics to Pull Energy out of Nothing where they discuss the work of Masahiro Hotta on transferring energy from a distant lab to another by analyzing the quantum fields and vacua. Putting this theory aside, the article claims that two experimental results (Rodriguez-Briones et al (March 2022) and Ikeda (January 2023)) have been simulated using qubits, under what they call quantum energy teleportation. I want to focus the discussion on these demonstrations.
Looking at Ikeda's paper and a follow up paper it seems to me that quantum energy teleportation is just quantum state teleportation, in particular:
- Alice wants to teleport energy to Bob
- Alice and Bob start with a quantum system in the ground state
- Alice performs some operations on her system (this leads either to an excited state or some superposition of ground state and other stuff)
- Alice and Bob follow the usual quantum state teleportation protocol
- Bob receives a quantum state that has in average more energy than the ground state
Is this what is happening in quantum energy teleportation (at least in the case where we use qubits instead of quantum fields) or is this an oversimplification?