Physicists at the University of Warsaw have uncovered a remarkable twist in quantum mechanics: entanglement, once thought irreversible, can now be shuffled back and forth without loss, if assisted by an entanglement battery. Much like a regular battery stores energy, this quantum version stores entanglement, letting scientists reversibly transform quantum states. Published in Physical Review Letters, the breakthrough reveals a quantum equivalent to Carnot’s second law of thermodynamics and could lead to more efficient quantum computing, secure communication, and even complex quantum networks, rewriting how we think about the flow of quantum information.
