Scientists think that paradox-free time travel is possible.

The idea of time travel is simple. The information must start to flow from the future to the past. We know how to travel to the future. We must just make something travel speed that is almost the speed of light. Because the craft or layer travels with the speed of photons or wave motion that thing causes time dilation. And that allows the object to travel to the future. But the problem is how to make information travel back in time. 

If researchers are using quantum entanglement to make information travel back in time, the energy level on the transmitting side must be higher than on receiving side. Because of the expansion of the universe and cosmic inflation. The future is at a lower energy level than the past. And that makes it very difficult to travel back in time. 

But if someday there is possible to send information to the past and create quantum entanglement throughout time and space. That thing makes it possible to bring energy from the past to the future. It makes it possible to create a crystal ball that sees to future. 

But receiving information from the future requires teleportation. But maybe in the future is possible to create a graphene layer or magic mirror that brings information from the future. That system includes two graphene nets. In another graphene layer, the system rises the energy level of electrons. 

That is trapped in the graphene net to the highest possible energy level. The energy level of those electrons will adjust by pumping energy to them by using a graphene net. The electron hovers in the graphene hole and electromagnetic stress is delivered to that electron by using graphene. And in another case. Energy can shoot away from the hole where the electron hovers. By using a laser ray. 

Then the energy level of electrons. That is in receiving graphene network will be put to the lowest possible level. Then those electrons will be superpositioned and entangled. The idea is that the distance between those systems will increase in time. And quantum entanglement brings information across time. That thing makes it possible to see the future. 

https://www.sciencealert.com/a-physicist-came-up-with-math-that-shows-paradox-free-time-travel-is-plausible