Re:Are “reversible” computers more energy efficient, faster?...
by Strilanc on Sunday July 26, 2020 @09:30PM
(#23961537)
Sort of. Measurement is not reversible, and often the most efficient method for uncomputing an intermediate value in a quantum computation is to measure it in the frequency domain and then perform a cheap fixup depending on what you measured [1]:
> Measurement based uncomputation intrinsically generates entropy (due to the X basis measurements), but it uses significantly fewer operations. So, ironically, we will optimize the energy usage of quantum computations not by staying pure to our reversible Landauer-less roots but instead by using an irreversible form of uncomputation that generates entropy.
https://physics.stackexchange.com/questions/392414/again-why...