A new study uses a quantum battery that stores quantum entanglement information. Scientists successfully reversed mix-state quantum entanglement, which could improve the manipulation and efficiency of future quantum systems. Take, for instance, the concept of quantum entanglement. In an idealized quantum system, for example, entanglement does feature a kind of entropy analogous to the first law of thermodynamics. The team succeeded by introducing another party to this quantum duo known as a “quantum battery.” Just as a normal battery stores thermodynamic energy, a quantum battery stores entanglement.