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⏪ Physicists designed a way to make a quantum system's arrow of time point backward. Not time travel. Something weirder and more useful.
Every time you measure a quantum system, the measurement kicks it and pumps energy in. A Los Alamos-led team built feedback protocols that can cancel, amplify, or flip that kick. Run it one way and you recover all the energy the measurement added. Run it harder and the system behaves as if time is flowing in reverse.
It's basically a working Maxwell's demon, pulling usable energy out of the act of observing. The catch: it's still theory, published in Physical Review X in February, and real measurements today only catch about half the signal, so the perfect version needs better detectors first.
Next up: testing it on superconducting qubits, where it could chip away at decoherence, the thing that keeps breaking quantum computers.
Paper: doi.org/10.1103/l18s-9vmh
LANL: lanl.gov/media/news/0319-resha…
