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An atom in a cavity between two mirrors (left) acts as a heat engine in a driven-dissipative quantum system in which energy is continuously added and lost to the environment. The fluctuations in the escaping light (centre) are reduced (right) if only the atom but not the light is described quantum mechanically.
A new framework separates useful light from waste heat inside atom-sized engines, resolving a conflict between two descriptions.
Shy Cohenupda