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This study demonstrates the feasibility of integrating quantum teleportation protocols directly into existing metropolitan fiber networks used by major telecom operators like Deutsche Telekom. By achieving 90% fidelity over a 30-km live link while co-propagating with classical C-band traffic, the research validates a practical pathway for hybrid quantum-classical infrastructure without requiring dedicated dark fiber.
Bichromatic Quantum Teleportation of Weak Coherent Polarization States on a Metropolitan Fiber
arXiv:2602.16613v2 Announce Type: replace Abstract: As quantum technologies mature, telecommunication operators have a clear opportunity to unlock and scale new services by providing the connectivity layer that links quantum computers, sensors, clocks, and other quantum devices. Realizing this opportunity requires demonstrating quantum networking protocols, including quantum teleportation, under real-world conditions on existing telecom infrastructure. In this work, we demonstrate quantum teleportation over Deutsche Telekom's metropolitan fiber testbed in Berlin using commercial components deployed at the telecom datacenter. A local Bell-state measurement between 795 nm photons from a weak coherent source and from a bichromatic warm-atom entangled photon source enables conditional state transfer onto an O-band photon, which is transmitted through a 30-km field-deployed fiber loop under real-world environmental conditions. The teleported state is reconstructed after propagation via state tomography, achieving an average teleportation fidelity of 90\% on the deployed link. System performance is evaluated in both the absence and the presence of co-propagating C-band classical traffic within the same fiber, demonstrating compatibility with wavelength-division multiplexed telecom infrastructure carrying live data channels.
Authors:Zofia A. Borowska, Shane Andrewski, Giorgio De Pascalis, Olivia Brasher, Mael Flament, Alexander N. Craddock, Niccolò Bigagli, Ronny Döring, Michaela Ritter, Ralf-Peter Braun, Klaus Jons, Marc Geitz, Oliver Holschke, Matheus Sena, Mehdi Namazi
Abstract:As quantum technologies mature, telecommunication operators have a clear opportunity to unlock and scale new services by providing the connectivity layer that links quantum computers, sensors, clocks, and other quantum devices. Realizing this opportunity requires demonstrating quantum networking protocols, including quantum teleportation, under real-world conditions on existing telecom infrastructure. In this work, we demonstrate quantum teleportation over Deutsche Telekom's metropolitan fiber testbed in Berlin using commercial components deployed at the telecom datacenter. A local Bell-state measurement between 795 nm photons from a weak coherent source and from a bichromatic warm-atom entangled photon source enables conditional state transfer onto an O-band photon, which is transmitted through a 30-km field-deployed fiber loop under real-world environmental conditions. The teleported state is reconstructed after propagation via state tomography, achieving an average teleportation fidelity of 90\% on the deployed link. System performance is evaluated in both the absence and the presence of co-propagating C-band classical traffic within the same fiber, demonstrating compatibility with wavelength-division multiplexed telecom infrastructure carrying live data channels.
arXiv:2602.16613 [quant-ph]
(or arXiv:2602.16613v2 [quant-ph] for this version)
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