the various current difficulties with creating photon based computers
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Photons are pretty much unstorable. Researchers were able to “stop” a photon very briefly, but that’s using super high tech lab equipment, and even then, it was only for fractions of a second. It would be unfeasably hard to get a pure photon computer to work on the timescales of a human, especially when we have transistor based computation available.
You could absorb the photon into an excited electron state, moving a magnetic bit, but that’s just what we do now in the first place.
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