Researchers demonstrate quantum teleportation of light patterns.
Quantum communication over long distances is an integral part of information security and has been demonstrated in free space and fiber with two-dimensional states, recently at distances greater than 1200 km between satellites. But the use of only two states reduces the information capacity of photons, so the link is safe, but slow. To make it safe and fast requires a larger alphabet, for example, using patterns of light, of which there is an infinite number. One of these sets of patterns is the angular orbital OAM momentum of light. Increasing bit rates can be achieved by using OAM as the carrier of the information. However, such photon states deteriorate when transmitted over long distances, for example, due to fiber mode coupling or turbulence in free space, thus requiring a way of amplifying the signal.
One result of this is that information from one photon can be transferred to the other, a process called teleportation. As in the science fiction series, Star Trek, where people radiate from one place to another, information is teleported from one place to another. If two photons are entangled and change a value in one of them, then another also changes automatically. This happens even though the two photons are never connected and, in fact, they are in two completely different places.
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