I don't understand quantum theory, the quantum communication described in the book at present, I saw it from the Internet, according to the information on the Internet, it has been possible to achieve 700 meters of underwater communication, according to this, it is not particularly out of place to achieve global coverage after 20 years, and I only said that it is underwater communication, but I did not say that the speed of light, and the fact that it is not faster than the speed of light should still be popularized in my book, at least most book friends, should know from me.

So, well, don't bother with quantum communication, it's really just an encryption method at present, and it really can't exceed the speed of light, because its carrier is a blue-green laser, and the attenuation of the blue-green laser in the water is relatively small, so it can reach 700 meters underwater.

It's really a bit overwritten here, and for the needs of the plot, the efficacy of quantum communication is amplified.

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