One of the main challenges in the development of distributed quantum networks (Distributed Quantum Networks) is to establish entanglement and transfer information between nodes that are completely separated in terms of location and have independent optical sources.

According to a report published on Phys.org in November 2025, researchers have succeeded in implementing a quantum teleportation protocol between photons that are produced from completely separate and distant laser sources.

🔻 Technical description of the achievement
In typical teleportation experiments, entangled pairs are usually produced from a single nonlinear crystal to ensure their synchronization and spectral overlap. But in real networks scenario, nodes are independent.
In this study, the research team succeeded in overcoming the challenge of indistinguishability of independent photons by using precise time synchronization and frequency stabilization mechanisms.

​⚙️ Test details
Hong-Ou-Mandel Interference (Hong-Ou-Mandel Interference): The key to the success of this experiment was achieving high-resolution interference between independent photons at the Bell Mode Measurement (BSM) station.
Fidelity: The quantum state was transmitted with high fidelity from the sender (Alice) to the receiver (Bob) who had an independent optical source.

🔬 Research importance
This achievement is a necessary step for building quantum repeaters. Without the ability to teleport between independent resources, it would be impossible to extend the quantum internet over long distances and connect heterogeneous quantum computers.

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