In this project, I asked the question whether quantum teleportation will allow time travel.
For example, once we build quantum computers, will we be able to communicate with others across space and across time as well? Will we be able to send MSN messages to our great-grand-kids? Will there be an internet not only across the world but across time also?

  We now know, using the principles of quantum entanglement, that we can teleport light beams and photons, transporting them instantaneously across space. By transporting them instantaneously, we are transporting them faster than light. Special relativity has shown us that the closer to the speed of light something travels, the more time dilates in that frame of reference, and the more length contracts. Because objects travel at different velocities relative to each other, they can have time progressing at different rates in their different frames of references. One object, can then, travel to the future of another object by dilating its time more than that other object (by traveling closer to the speed of light than the other object). And so, all time travel really is, is one object changing its frame of reference relative to another object and then returning to the other object’s frame of reference.

  General relativity shows us another way to slow time. It shows that the more mass an object has, the more it warps space-time. It also says that the more mass something has the more its gravitational effects and the more it slows time. General relativity then provides a second way for one object to change its frame of reference relative to another object, traveling to that other object’s future.   Experimentally we have sent particles forward in time using accelerators, and have proven time shifts and forward time travel. We have also proven time shifts suggested by general and special relativity with experiments using planes and atomic clocks. In fact, we know that time shifts are so real that we have to design around them. For example, we have had to correct for time shifts while designing Global Positioning Satellite systems.

  The next step is to travel back in time. To do that we need to make time stop. There are two ways of doing this: traveling at the speed of light to dilate time at such a level that it stops, or finding a strong enough gravitational field that would dilate time enough to make it stop for an object in that gravitational field.

  One theory of where to find such a gravitational field in our universe is a wormhole. This however, presents some problems which, although there are some solutions to, are still extremely hard to overcome, and probably will not be solved in the near future.

  When we teleport a signal, that means we are sending it instantaneously across the universe. Einstein said that traveling at this speed (faster than light) would allow that object’s time to stop. Once something’s time stops, time no longer applies to it the way it applies to us. That object can then, sort of “step of the train” and choose where to get back on.

  We know that time shifts are possible, and that teleportation is possible. Right now we are working on building quantum computers, so it may be possible to send information across time and space, and to have an internet that functions across both time and space.