Such optical cavities could be used in quantum engines
Max Planck Institute for Quantum Optics
A single atom in a reflective cavity could be enough to drive the piston of a small quantum engine.
The essential feature of an engine is its ability to convert heat into work and move mechanical parts. In an internal combustion engine, when gases are combusted, they expand and push pistons, which ultimately move the car's wheels or turbine blades. Alvaro Tejero At the University of Granada in Spain…
Source: www.newscientist.com
