Newly published Articles describe important Steps on the Path to future Quantum Networks –
In recent years, Quantum Networks have increasingly moved into the focus of research. They have the potential not only to enhance the security of critical infrastructures but also to enable new applications – ranging from the secure interconnection of Quantum Computers to a future Quantum Internet. A central building block of such networks is Quantum Teleportation. Against this background, two articles involving the QR.N consortium were published in Nature Communications in mid-November 2025.
The first paper, entitled “Telecom-wavelength quantum teleportation using frequency-converted photons from remote quantum dots,“ addresses photonic Quantum Teleportation using semiconductor Quantum Dots. Researchers from the consortium at the Stuttgart, Saarbrücken, and Dresden sites conducted an experiment with two spatially separated GaAs Quantum Dots: one served as a source of entangled photon pairs, while the other acted as a single-photon source. The results show that the resulting post-selected teleportation fidelity reached 0.721(33) – well above the classical limit – thereby demonstrating the successful transfer of Quantum Information between photons originating from different sources. Further details can be found in the report on the publication.
The second paper, entitled “Quantum teleportation with dissimilar quantum dots over a hybrid quantum network,” describes a field demonstration representing an important step toward the realization of solid-state-based Quantum Repeaters. Researchers at the Paderborn, Garching, Würzburg, and Karlsruhe sites prepared two dissimilar semiconductor Quantum Dots such that they were suitable for the teleportation of polarization qubits. The demonstration was carried out in a hybrid Quantum Network using near-infrared photons: one part of the link was implemented via optical fiber, while another spanned a 270 m free-space optical path across the campus of Sapienza University of Rome. The achieved teleportation fidelity reached up to 82 ± 1%, exceeding the classical limit by more than ten standard deviations – providing clear evidence of successful Quantum Teleportation under realistic conditions. A detailed report on the publication is available here.
Further information on the paper “Telecom-wavelength quantum teleportation using frequency-converted photons from remote quantum dots” is also available in the official press release issued by the Universität Stuttgart. An official press release on the paper “Quantum teleportation with dissimilar quantum dots over a hybrid quantum network” has likewise been published by the Universität Paderborn.
We congratulate the participating teams on their published articles and look forward to further research successes from the consortium. These and other publications by the QR.N consortium can now be found in the Publications section.
Source references: https://www.nature.com/articles/s41467-025-65912-8; https://www.nature.com/articles/s41467-025-65911-9
