If you want to take this question to the next level (and beyond any current real-world applications), read up on Reversible Computing (https://en.wikipedia.org/

If you want to take this question to the next level (and beyond any current real-world applications), read up on Reversible Computing (https://en.wikipedia.org/wiki/Reversible_computing https://en.wikipedia.org/wiki/Reversible_computing), which is the concept of performing computation at (near) zero energy cost.