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OK, but can you detect in the spaceship when Q2 collapses? (I know no quantum physics beyond a few articles0

If so why can't you simply modulate the signal on top of a series of collapsing entangled pairs. Basically morse code with the timing of the collapses, you don't care what value they collapse too.

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Nice try, but no - basically, to use your phrasing, there's nothing to detect when Q2 collapses.

No. You can ask the spaceship to measure Q2 after a certain period of time. So "fly away and at a specific time T measure Q2" would be the command. Sorry I should have made that more clear.

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