Do they have self powered electronics yet?

[Dave]

I was wondering if they have self powered electronics, from shot noise,
quantum fluctuations, remnant EMC, or something yet (at room temperature).

This should make devices much cheaper and more powerful at scale, since
there should be no need for cooling or power tracks on the board.

[Jim Pennino]

For well over a hundred years now.

https://en.wikipedia.org/wiki/Crystal_radio

[Lou]

https://news.uark.edu/articles/54830/physicists-build-circuit-that-generates-clean-limitless-power-from-graphene

[Clutterfreak]

There was an article around 1990 that even hit the regular newspapers (I
read in in Dallas Morning News). It was a description of how physicists
were going to create an electronic board for PCs which worked by
electric charges moving in both directions rather than just one way.
Each motion in a direction would also preserve the moved charge on a
storage creating a potential, and then if a move in the opposite
direction was needed this stored charge would again be used moving in
that other direction, not the charge supplied by connected outside
power! In this way instead of using a stream of direct current by a 5
volt potential difference which used up outside power constantly, most
of the "consumption" of electricity was just reconsumption of what was
used before, reducing the outside power usage to minimum.

I wonder if this thing took off.

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[Dave]

Thanks for that. The necessary calculations don't need much computing
power. (Apollo missions computer vs smart smart watches). Maybe they
need to put encryption/decryption into hardware like they have done with
graphics.