I reject the idea that energy consumption is inherently bad. We want more energy for everyone. Energy is freedom. You could measure economic and social progress largely by the useful energy individuals have at their disposal.
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Reversible computing can be used to do computing with (in principle) zero energy consumption.
The proof is usually attributed to a 1973 paper by Bennett, but I particularly like the explanation of Fredkin and Toffoli and their billiard ball model of computing: http://fab.cba.mit.edu/classes/862.16/notes/computation/Fredkin-2002.pdf …
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Yes, my bad.
@anderssandberg and@robinhanson have pointed this out to me, and I should have remembered. I definitely don't understand the physics yet, but thanks for pointing to the paper - it looks like it might be a clearer explanation than I've yet seen. But the point stands:https://twitter.com/davidmanheim/status/1083645585784299520 … -
Section 3.6 has a model which is just billiard balls rolling round a table, doing universal computing. No energy consumption at all. It's a very nice model, albeit not physically practical.
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