I know its risky to rely on wikipedia, but on the page on quantum entanglement, it claims that possibly instantly, as soon as one of a pair of entangled particles is measured (say A), then the opposite one (say B) takes on the opposite value. Now to know this, I assume B must somehow know the time when the value of B's particle takes on a value. To labor the point, lets say A measures their particle at 12:00, so at 11:59 B must have known that their particle hadn't been measured, but at 12:00+ a small amount of time, that it had. So if everything above here is true, can't this be used for faster than light communication. To do this, if A wants to send a 0, the procedure would be to measure the particle at some pre-specified time (say 12:00), but for 1, to not measure the particle. So then B, wherever they were, would simply have to check their particle at 12:00+a small amount of time, and then by seeing whether or not the particle had been measured, they would know whether or not A wanted to send a 0 or 1. To labor the point, the value of the particle is irrelavant - its merely necessary to establish whether the particles are still indefinite, or if they have been measured.