Quantum teleportation over long distances is technically possible.
Scientists have carried out the transfer of information encoded in the particles of light, using quantum teleportation over a distance of 30 kilometers. The results of the experiment are presented in two papers published in the journal Nature Photonics.
Quantum teleportation using a fiber-optic network can significantly improve the safety and strength of Internet connections. However, in the transmission of information over long distances requires an independent light sources. The problem is that the light beam from one source after passage of several kilometers should remain indistinguishable relative to the light beam from another source.
To solve this problem, two research groups independently from each other have developed feedback mechanisms and synchronization of light signals especially for his experiments in quantum teleportation. In one case, was used light with a wavelength characteristic of telecommunications. This will minimize the rate at which the photon signal loses its intensity during its passage in the optical fiber. Another research group also used a light beam with a wavelength of 795 nanometers.
The results of the experiment showed that quantum teleportation over long distances is technically possible. The researchers hope that their work will allow to develop new technologies that will improve the efficiency of transmission is encoded in elementary particles of information.
