Special and generalrelativity provide us with theories about methods of time travel. Experiments prove the accuracy of those theories. Teleportation and wormholes may provide methods of applying these theories to actually travel in time.

Teleportation involves sending things (and already has sent light beams and photons) instantaneously across space. To send something across space, you have to send it across time, and if something jumps ahead in space, it has to jump ahead in time. Also, sending something instantaneously, is sending it faster than light. So, even if we don't have enough energy to accelerate something to past the speed of light, teleportation might provide a loophole to sending it at or faster than the speed of light. Einstein said that this wasn’t possible, but he also said that if it did happen, time would stop and length would contract to zero. So if we could teleport atoms as well as photons, we may be able to send things other than light in time. But even teleporting something as simple as photons can lead us to making quantum computers and allow us to send information accross space instanteously. This makes it possible to communicate across time. In theory, two people with quantum computers may be able to communicate across time.

Just like accelerating faster than light and travelling through a wormhole, teleportation can also provide another concept of time travel. Also, just like a wormhole presents the problem of getting through it, teleportation of complex objects is not within our reach. But even if we could find a way to travel through time in wormholes, or teleport information through some poral to the future or the past, we would still have the paradoxes to deal with. Will the universe really let us send information across time?

For example, the grandmother paradox could potentially rule out all possibility of past time travel. And if, for the sake of argument, self-consistancy is incorrect, what dangers would come with time travel. What would happen if we could send information back in time. Warning people to stay off the Titanic, for example, may result in allowing another Hitler to live. However, self-consistancy has passed through many thought experiments and we have not found any problems with it. So the grandmother paradox and the idea of changing history for the worse will probably not be a problem. But then, we would only be able to observe the past and future but not actually change it.  

Self-consistancy may solve the grandmother paradox, but it leaves the Jinn paradox. Quantum computers would also create Jinn, and there is currently no solution to them. Could Jinn be the concept that rules out past time travel for information? Maybe, but the question is when a Jinn is created? Jinn are supposed to exist as information in a loop in time with no start or end. Using quantum computers, the information going back or forawrd in time could be created at either of the points where a Jinn operates (when it goes back in time and when it is given to the person, or put in the position where it is about to be taken back in time). Even if we can not tell when a jinn was first created, does that matter? Could someone set up a Jinn even if it is impossible to tell where the Jinn started? Either way there is still the problem of the damage to a Jinn being repaired, but in the future we will need new theories like self-consistancy will be made and one of them may solve these problems.  

Another solution to the grandmother paradox is the “Many Worlds Theory” (or the “Multiverse Theory”) that is based on the theories of quantum mechanics. Although this may seem fictional, if it were real, it would work with self-consistancy, wormholes, and would solve the grandmother paradox. In this solution, as well as self-consistancy, we would not be able to change our own past. It is also based on the same theory of the universe that has made teleportation (and maybe a new way of time travel) possible. It may be that no matter what we do, we still will not find a way to change our own past even if we could travel, or send information, to it.

In the future, major areas of progress for time travel may include: creating a fully functioning quantum computer, the successful teleportation of an atom, a solution to traveling through a wormhole, and finding a huge energy source (like dark energy) that can be used to accelerate particles, or even larger objects, at the speed of light. But teleportation of information through quantum entanglement is very likely to lead to some interesting time shift problems that will have to be solved long before we can teleport an atom.