Landauer's principle (1961)
Rolf Landauer at IBM showed that erasing one bit of information must dissipate at least kT ln(2) of energy, about 0.017 electronvolts at room temperature. This set a thermodynamic floor for all computing.
The result was largely theoretical for decades, with real devices consuming millions of times more energy per operation.
The Landauer limit became a benchmark for energy-efficient computing research, and the Edinburgh team's work is explicitly measured against it.
The Edinburgh team's simulations bring magnetic switching within striking distance of this fundamental limit.
