Quantum entanglement is like an invisible spring between particles — squeeze one, and the other twitches, no matter where it is. In the new work, physicists built a model of four spins (tiny magnetic arrows) in a chain, where the end spins are held by a local magnetic field. This field acts like an adjustable clamp: it can weaken or strengthen the coupling of the end particles to the rest of the chain.
The energy teleportation protocol works like this. At one end of the chain, a measurement is performed, like giving the spring a tug. At the other end, upon learning the measurement result, the magnetic field is quickly 'tweaked' to extract energy. And here's the surprise: the most energy is extracted not at the strongest field, nor at the weakest, but somewhere in between.
The authors noticed that the curve of extracted energy almost exactly mirrors the graph of entropy (a measure of disorder) change under feedback. This suggests that feedback doesn't just command, but redistributes entanglement so that part of it turns into pure energy. It turns out that quantum information is not an abstraction, but a fuel that can be extracted from the vacuum if you know how to turn the knob.
Quantum energy teleportation does not violate the conservation law: energy does not arise from nothing, but is extracted from entanglement that was 'stored' in the system beforehand.
In Isaac Asimov's novel 'The End of Eternity', energy is drawn from time — here, its source is quantum entanglement, reminiscent of the idea of instant transfer of resources across space.