Telecom-wavelength quantum teleportation using frequency-converted photons from remote quantum dots

Tim Strobel (), Michal Vyvlecka, Ilenia Neureuther, Tobias Bauer, Marlon Schäfer, Stefan Kazmaier, Nand Lal Sharma, Raphael Joos, Jonas H. Weber, Cornelius Nawrath, Weijie Nie, Ghata Bhayani, Caspar Hopfmann, Christoph Becher, Peter Michler and Simone Luca Portalupi
Additional contact information
Tim Strobel: University of Stuttgart
Michal Vyvlecka: University of Stuttgart
Ilenia Neureuther: University of Stuttgart
Tobias Bauer: Universität des Saarlandes
Marlon Schäfer: Universität des Saarlandes
Stefan Kazmaier: University of Stuttgart
Nand Lal Sharma: Leibniz IFW Dresden
Raphael Joos: University of Stuttgart
Jonas H. Weber: University of Stuttgart
Cornelius Nawrath: University of Stuttgart
Weijie Nie: Leibniz IFW Dresden
Ghata Bhayani: Leibniz IFW Dresden
Caspar Hopfmann: Leibniz IFW Dresden
Christoph Becher: Universität des Saarlandes
Peter Michler: University of Stuttgart
Simone Luca Portalupi: University of Stuttgart

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract A global quantum internet is based on scalable networks, which require reliable quantum hardware. Among them are quantum light sources providing deterministic, high-brightness, high-fidelity entangled photons and quantum memories with coherence times exceeding the millisecond range. Long-distance operation demands quantum light sources emitting at telecommunication wavelengths. A cornerstone for such networks is the demonstration of quantum teleportation. Here, we realize full-photonic quantum teleportation employing semiconductor quantum dots, which can fulfill all the aforementioned requirements. Two remote GaAs quantum dots, emitting in the near-infrared, are used: one as an entangled-photon pair source and the other as a single-photon source. During the experiment, the single photon is prepared in conjugate polarization states and interfaced with the biexciton emission of the entangled pair employing a polarization-selective Bell state measurement. This process teleports the respective polarization state onto the exciton emission of the entangled pair. The frequency mismatch between the triggered sources is erased using two polarization-preserving quantum frequency converters, enabling remote two-photon interference at telecommunication wavelengths, yielding a visibility of 30(1)%. A post-selected teleportation fidelity up to 0.721(33), significantly above the classical limit, demonstrates successful quantum teleportation between light from distinct sources. These results mark an important development for semiconductor-based quantum light sources.

Date: 2025
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DOI: 10.1038/s41467-025-65912-8

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