Physicists at the universities of Innsbruck in Austria and Paris-Saclay in France have combined all the key functionalities of a long-distance quantum network into a single system for the first time. In a proof-ofprinciple experiment, they used the system to transfer quantum information via a so-called repeater node over a distance of 50 km – far enough to indicate that the building blocks of practical, large-scale quantum networks may soon be within reach (Phys. Rev. Lett. 130 213601).
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