[readerrrr]

I think you could get away with it without violating anything, if both parties are stationary to each other in time and space just in different locations in space.

For example, a ship travels to a nearby star, at near c. It gets there almost immediately in its time, and it takes 4 years in out time. But once it is there and is not moving relative to us, ftl communication doesn't violate anything. Or at least I can't image a scenario how could it as long as you can only transmit with that rule.

Unfortunately we can only test collapse in the same( practically ) reference frame. You know what would be interesting; measuring if the collapse is really instantaneous, if the two parties are moving away from each other at significant fractions of c. Maybe it isn't and that solves the problem. Or maybe collapse stops working if one party is moving very fast.

[phazmatis]

If the ship flies out and comes back immediately, then stops, can it then send information back in time?

[readerrrr]

No. I don't see how. Be more specific if that wasn't a question.

Now, my idea works if you assume that the collapse is instantaneous, it doesn't travel at all. Therefore the logic that the equations show that the information ends in the past doesn't apply.