Reversible computing[1] allows us to use less energy than the von Neumann–Landauer limit of kT ln(2) energy dissipated per irreversible bit operation (note that

Reversible computing[1] allows us to use less energy than the von Neumann–Landauer limit of kT ln(2) energy dissipated per irreversible bit operation (note that our current technology is still many orders of magnitude from this limit). It does not reduce the energy requirements to zero. [1] https://en.wikipedia.org/wiki/Reversible_computing https://en.wikipedia.org/wiki/Reversible_computing