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Quantum messages travel 254 km using existing infrastructure for the first time

Quantum messages sent across a 254-km telecom network in Germany represent the first known report of coherent quantum communications using existing commercial telecommunication infrastructure.

The demonstration, reported in Nature this week, suggests that quantum communications can be achieved in real-world conditions.

Quantum networks have the potential to enable , such as a quantum internet; quantum is one example of a theoretically secure communication technique.

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