Scientists have discovered a way to make quantum entanglement reversible, something long thought to be impossible, by using a conceptual device called an entanglement battery.
Much like a regular battery stores energy, this theoretical tool can store and release entanglement, allowing quantum states to be transformed and reversed without loss. This breakthrough reveals a new “second law” for quantum mechanics, echoing the principles of thermodynamics and opening the door to more efficient quantum technologies and a unified framework for manipulating quantum resources.
More than 200 years after French physicist Sadi Carnot introduced the second law of thermodynamics, scientists have uncovered a strikingly similar rule in the quantum world. A team of international researchers has discovered what they’re calling a second law of entanglement manipulation.
This new law shows that quantum entanglement, a phenomenon at the heart of quantum mechanics, can be reversibly manipulated, much like how heat or energy behaves in thermodynamics. Until now, many experts believed such reversibility was impossible. The findings, published on July 2, 2025, in Physical Review Letters, offer powerful new insights into the basic nature of entanglement and how it might be harnessed more effectively in future quantum technologies.
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