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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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.
In general, there will be noise in models like this, and some energy dissipation is required to remove it through error-correction. But there's no in principle lower bound to that noise.
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Horizon radiation actually gives a lower bound to temperature. Still, Robin pointed out one can cool further with absurd insulation; am still working out the total thermodynamic cost and optimizing. Would love to see time bounds too - reversible is *slow*.
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What horizon are you referring to? If you simply mean there's ambient noise due to the rest of the universe, the standard approach is to isolate the system. I'm not sure what the fundamental physical limits will be to that, but (a) they'll be incredibly low; and (b) they seem
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