Photon teleportation achieved between two independent quantum dots

Researchers at the University of Stuttgart, in collaboration with partners from the Leibniz Institute for Solid State and Materials Research in Dresden and Saarland University, have successfully demonstrated quantum teleportation between photons emitted by two different quantum dots. This breakthrough addresses a critical challenge in building quantum repeaters, which are essential for extending secure quantum communication over long distances via fiber networks. By using nearly identical quantum dots to generate single photons and entangled photon pairs, and employing quantum frequency converters to align their frequencies, the team achieved a transfer of polarization states with a success rate slightly above 70 percent. This achievement marks the first time quantum information has been teleported between photons from independent quantum dots, a feat previously hindered by the difficulty of producing indistinguishable photons from separate sources. The experiment involved sending one photon through a 10-meter optical fiber to interfere with another, enabling the teleportation process. The work is part of the Quantenrepeater.Net project, a large German research consortium aiming to develop quantum repeat