On 9/20/2013 10:38 AM, John Clark wrote:
On Thu, Sep 19, 2013 at 6:10 PM, LizR <lizj...@gmail.com 
<mailto:lizj...@gmail.com>> wrote:

        >> As Rolf Landauer said "Computation is physical", all computations 
must use
        energy and generate heat. And what's the difference between a physical 
        and a non-physical process anyway?

    > I thought it was only erasing the results of computations that had to use 
    and increase entropy? - if so - quibbling, I know, but sometimes quibbles 
    important consequences.

A computation always takes a nonzero amount of energy to perform, theoretically you can make the energy used be as close to zero as you like, but the less energy you use the slower the calculation.

That's in the limit of erasing registers isentropically. But if you don't erase at all, you keep the calculation reversible, there's no necessary loss.


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