Just to offer a slightly different rewording that may be more intuitive: Under quantum mechanics, information may not be destroyed, only moved around (this is

Just to offer a slightly different rewording that may be more intuitive: Under quantum mechanics, information may not be destroyed, only moved around (this is implied by the fancy physics/math term 'unitarity'). When you 'destroy' a bit in your (sub-)system, you’re actually transferring that bit into the surrounding environment, which shows up as heat. Reversible computing avoids that heat generation by keeping all relevant state within your subsystem. The terminology around 'destroying information' can be confusing because the particular system under discussion isn’t always clear.