Sounds implausible at first doesn't it? Here is how it might theoretically be possible. Can you prove me wrong?
Stephen Hawkings agrees it is theoreticaly possible to travel into the future by accelerating a person or object to near the speed of light. Travelling to the past however does not seem possible so that person would be permanently in the future. They would also be unable to communicate with us using current technology snce that would involve sending something into the pas which is theoretically implausible.
Here is where spooky physics might help us. When two particles are entangled and the properties of one changes the properties of the second particle change identically and instantaneously even if the particles are spatially separated. Experiments have already shown this to be true. Assume someone were to invent a pair of linked quantum channel devices. Now send one of the devices into the future just like Staphen Hawkings suggests. If the particles remain entangled would be then be able to have two way communications with someone from the future?