Re: Retrocausality Experiment
I have a feeling this will turn out to be another interesting-but-useless factoid about quantum entanglement. If one receives signals from the future, what happens if you do not then send the signal? Answer: probably nothing, which will invigorate SF and theoretical physics to no end, but will have no meaningful technological application.
I've got a spoof story on the backburner positing that information can be sent FTL, but the net amount of information must remain STL. In other words if you receive data FTL, an equal or greater amount of your existing information is destroyed. Which doesn't bode well when they launch an interstellar probe that sends back data via quantum entanglement.