Glad it was worth rereading. I do put real effort in when I take the time to post here.

Delightfully, my searches around the topic of vacuum pressure you mention brought to my attention an unsolved physics problem. I'll surely enjoy trying to get a handle on the cosmological constant problem and all the trappings needed to comprehend it.

To more directly address this comment, I'm highly skeptical about the idea of computers without physical extension or energy demands. I'm dubious about anything without physical extension, but I'll refrain from ontological digression this time.

I took a bit of time to dip my autodidactic toes into topics related vacuum energy, as I mentioned. My first (admittedly plebeian, as the math employed easily outstrips my current knowledge) impression is that using virtual particles, quantum fluctuations and other such teeny-tiny phenomena to do useful computing might self-sabotage in subtle ways. It gives me a shadowy and vague impression of similarity to a brownian ratchet.

If you've never looked into it, the brownian ratchet thought experiment is quite interesting. Simply put it considers an itsy-bitsy ratcheting wheel, small enough to be driven by being bumped into by the random movement of particles in a fluid at thermal equilibrium. Since the wheel is prevented from moving in one direction by a pawl, at first glance it would seem that useful work could be extracted from this device without any input of energy. The wheel would advance in one direction and in principal you could lift a weight, drive a motor or what have you.

Sounds great, but it doesn't pan out so smoothly. Essentially the device's parts must be so small as to themselves be knocked around by brownian motion, causing the pawl to bounce up and down, allowing the wheel to slip and move backward as often as forward. All of this has been more rigorously proved, and I encourage you (or anyone else who might happen upon this) to check it out on your favorite open collaboration encyclopedia that begins with a 'W', or anywhere else you can find acceptable info.

It strikes me that a similar thing might happen to these vacuum pressure computers. Just a blurry hunch though, I'm not terribly sure.

Another thing to think about is that you might have to wrangle the system into some useful state which will require energy. Like how superconductors can carry electrical energy with 100% efficiency, but if you factor in the energy input needed to cool the superconducting materials the efficiency drops from that ideal.

Just returning the favor with some stuff to think about.

See you around.