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It's dealing with values of orbital momentum. If you need more capacity, you can add a new "channel" that has more momentum, and run it right next to all the others. Rinse repeat, unbounded capacity without increasing spectrum usage. I suppose eventually the amount of energy you have to put into it will cause relativistic effects :)

Given unbounded transmission power, just about any transmission method has unbounded capacity, no? Of course, assuming unbounded transmission power is stupidly unrealistic.

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