When i read the title, as a non-physicist, non-scientist, it sounds like the precursor to...teleportation! Over 20 miles distance. What is wrong with me for thinking that :)
A fellow non-physicist, non-scientist here. If I understand correctly the problem is that if you attempt to change the state of one particle, two particles are no longer entangled. In other words you can observe one particle and be sure that the other particle has the same properties but the moment you decide to change one particle's state you can't say anything about the other particle.
not teleportation. i see it as the precuror to literal instant messaging. writing a message with two entangled receivers could mean sending messages faster than the speed of light.... just me dreaming though