An optical computer (also called a photonic computer) is a device thatuses the photons in visible light or infrared (IR) beams,rather than electric current, to perform digital computations.
Currently scientist are working on this : even government has just raised the fund ($6 million) to speed up the process.
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It strikes me as kind of a lottery ticket type of domain. You could luck out and it will be worth a lot some day, or it may be worth nothing. It's definitely worth holding though.