A practical problem plaguing long distance quantum teleportation has been solved by researchers in Austria. Until now, verifying that information has been transmitted has required the quantum link itself to be destroyed, preventing any further use.
Quantum teleportation involves “entangling” two particles so that any change to the state of one also occurs instantly in its twin, wherever it may be.
In this case, the researchers entangle a pair of photons a then fire a single photon at one of the pair. The resulting interaction changes the state of both entangled photons, effectively teleporting a quantum bit of information – known as a qubit – from one place to another.