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Well, we will have to wait for any possible actual working thing.
That is working in the way of being at all useful.
I see idea like this come and go all the time. I equate it to using antennas and diodes and getting power out of the air.
It may have a practical application for spies. A small trickle charge to miniature battery and circuit, can digitally record audio, and then the battery charges enough, send a single microsecond transmission to a receiver, with very little power, and continually recharge and do it over and over for decades.