Physicists built a quantum engine that runs entirely on heat—no moving parts, no timing, nothing.
arXiv · March 17, 2026 · 2603.15355
The Takeaway
Most engines, from car cylinders to steam turbines, require a 'drive' or timing mechanism to function. This experiment demonstrates a device that generates power purely from the natural flow of heat between hot and cold reservoirs at the atomic scale, fulfilling a long-standing theoretical goal in thermodynamics.
From the abstract
Quantum heat engines provide attractive means in quantum thermodynamics for studying the fundamentals of the flow of heat and work. Previous experimental implementations of heat engines operating at the level of a few excitation quanta have utilized external driving, which has made the observation of the produced work challenging. Conversely, autonomous quantum heat engines only require a flow of heat to operate and generate work. However, autonomous quantum heat engines have not yet been experi