reversible cellular automata
... that for conventional computers, Landauer's principle gives a nonzero lower bound on energy per step, but the energy usage of reversible cellular automata can be arbitrarily close to zero?
... that for conventional computers, <a href="./Landauer's_principle" id="mwBb4" rel="mw:WikiLink" title="Landauer's principle">Landauer's principle</a> gives a nonzero lower bound on energy per step, but the energy usage of <b id="mwBb8"><a href="./Reversible_cellular_automaton" id="mwBcA" rel="mw:WikiLink" title="Reversible cellular automaton">reversible cellular automata</a></b> can be arbitrarily close to zero?