November 17, 2025, No. 40
“Researchers at the University of Stuttgart teleport quanta between photons from two distant light sources, achieving a decisive breakthrough in the development of quantum repeaters.”
Information is “beamed” from one photon to another
At the University of Stuttgart, the team succeeded in teleporting the polarization state of a photon originating from one quantum dot to another photon from a second quantum dot. One quantum dot generates a single photon, the other an entangled photon pair. “Entangled” means that the two particles constitute a single quantum entity, even when they are physically separated. One of the two particles travels to the second quantum dot and interferes with its light particle. The two overlap. Because of this superposition, the information of the single photon is transferred to the distant partner of the pair. Instrumental for the success of the experiment were “quantum frequency converters”, which compensate residual frequency differences between the photons. These converters were developed by a team led by Prof. Christoph Becher, an expert in quantum optics at Saarland University.”🙌
