It's not really science fiction since there are scientists working on it right now, because capitalism is the brake of development. I would invest on photonic computer research, that would help advancement of society in all aspect.
this post was submitted on 03 Mar 2024
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Asklemmy
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I read an ieee paper a few years ago that went into why photonic computing failed and why it won't ever succeed.
The problem is that photons are fat compared to electrons so circuits couldn't be made as small as they are already today. When cmos was 500 nm and researchers weren't sure if things could be made smaller, photonics made sense. But now they're at 3nm process (yes it is a marketing label, but pitch is 24 nm ) . Visible light has a wavelength of 400nm. The wave function of a photon would smear across circuits that small.
Intel presented photonic data bus between chips couple of months ago so I don't think compute would be useful other than quantum stuff.
Being able to photosynthesize. It wouldn't be that hard either, we already can, just not to make food.
I would stay in relatively achievable things like a sugar fuel cell or microbial food production. Things we don't quite have yet but not do to the knowledge not being there.
Cybernetics hands down.
Replicator. But that kinda seems impossible so that Black and Decker rehydrator thingy from Back to the Future II.