Quantum entanglement, instead of oil or coal, powers a new kind of engine

https://www.earth.com/news/quantum-entanglement-instead-of-oil-or-coal-powers-a-new-kind-of-engine/

"at very low temperatures bosons settle into lower energy states than fermions do... changing bosons into fermions and back creates work, cycling powers engine without using heat (quantum needs coolness), using energy difference... up to 25% efficient... tiny batteries, precise sensors"