Germany surprises the world by demonstrating quantum teleportation over 30 km of commercial optical fiber using entangled photons, bringing quantum internet closer to existing infrastructure.

Written by Alisson Ficher

Published on 24/04/2026 at 14:24

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Advance in real telecommunications network brings quantum teleportation closer to practical use by integrating advanced physics with already installed cables, indicating that quantum states can be transmitted outside the laboratory with high fidelity even amidst conventional data traffic.

Deutsche Telekom, in partnership with Qunnect, demonstrated quantum teleportation over 30 kilometers of commercial fiber optic cable in Berlin’s metropolitan network, conducting the experiment outside a controlled environment while simultaneously maintaining active conventional data traffic on the infrastructure.

During the trial conducted in January 2026, the system achieved an average fidelity of 90% in the transfer of quantum information, as disclosed by the German operator, with momentary peaks reaching 95% under certain operational network conditions.

Quantum teleportation in active urban network

Although the term suggests physical displacement, quantum teleportation does not involve moving particles or objects, but rather reconstructing the original quantum state at the destination through entanglement previously shared between the points connected by the infrastructure.

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Existing infrastructure as the basis for the quantum internet

One of the central points of the advance is the use of already installed optical fibers, eliminating the need to build an entirely new network, which can significantly accelerate the practical viability of the so-called quantum internet on an urban scale.

At the same time, the coexistence of classical and quantum signals on the same network reinforces the complexity of the test, as this interaction tends to degrade qubits and reduce transmission quality when adequate control mechanisms are not in place.

According to Deutsche Telekom, this is one of the first practical tests integrating essential components of quantum teleportation in an operational environment controlled by an operator, bringing the technology closer to real applications in the telecommunications sector.

Entangled photons and transmission stability

To enable the experiment, Qunnect’s platform generated entangled photon pairs and applied polarization compensation systems capable of neutralizing interference caused by underground sections, aerial cables, and environmental variations typical of complex urban networks.

Test in Germany demonstrates quantum teleportation over commercial fiber optics and brings the quantum internet closer to real use.

Furthermore, the process used a wavelength of 795 nanometers, considered strategic for integration with different emerging technologies, including neutral atom quantum computers, atomic clocks, and high-precision sensors.

Thus, the demonstration expands the scope of quantum teleportation, indicating that telecommunications infrastructure can function as a connection layer between distinct quantum devices, going beyond simple data transmission in future networks.

Practical applications and next tests

According to Deutsche Telekom, quantum networks based on this type of architecture will be able to support advanced encryption, distributed computing, more secure cloud services, and sensor systems connected over long distances with high precision.

Still, the current scenario does not indicate immediate commercial availability, as the next steps involve extending distances, integrating multiple nodes, and validating transmission stability in more complex and scalable networks.

There are also strategic implications, especially in the European context, where the development of proprietary quantum infrastructure is seen as a relevant factor in reducing external technological dependencies in critical areas such as security and communication.

This advancement builds on previous entanglement distribution tests in metropolitan fibers but differs by inserting quantum teleportation directly into operational racks, under the management of an operator, bringing theory and practice closer together in the same functional environment.

Germany surprises the world by demonstrating quantum teleportation over 30 km of commercial optical fiber using entangled photons, bringing quantum internet closer to existing infrastructure.

Advance in real telecommunications network brings quantum teleportation closer to practical use by integrating advanced physics with already installed cables, indicating that quantum states can be transmitted outside the laboratory with high fidelity even amidst conventional data traffic.

Quantum teleportation in active urban network

Existing infrastructure as the basis for the quantum internet

Entangled photons and transmission stability

Practical applications and next tests

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Germany surprises the world by demonstrating quantum teleportation over 30 km of commercial optical fiber using entangled photons, bringing quantum internet closer to existing infrastructure.

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Quantum teleportation in active urban network

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Entangled photons and transmission stability

Practical applications and next tests

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