Hannah Earley


"When voltage turns on in a wire, for example, the metal heats up, with more heat the faster the voltage changes. The more slowly a reversible computer runs, the less heat it emits, a relationship Earley calculated precisely.

"That relationship between heat and speed is crucial for reversible computing’s most promising application: AI. 

"Computations in AI are often run in parallel, meaning different processors each run one part of a computation. 

"This creates an opportunity for reversible computing to shine. If you run reversible chips more slowly, but use more of them to compensate, you end up saving energy: The advantage of running each chip more slowly wins out against the disadvantage of running more chips. 

"And if you run them slowly enough, you might get away with not needing as much cooling, which will let you pile chips closer together to save on space, materials, and time spent shuttling data between them."

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