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Researchers are tackling quantum internet problems from all different angles, which is why you'll see a variety of distances mentioned in studies — they're not all measuring the same technology, using the same equipment, to test the same standards. Northup said. In total, the lengths of fibre used to channel each cubit added to 44 kilometres, setting a new limit to how far we can send entangled qubits and still successfully use them to teleport quantum information. In effect, the electrons were given the same spin, and thus were joined, or entangled, in a common quantum state, each storing the same information: a particular combination of 1 and 0. Tags Computing. It's never before been demonstrated to work over such a long distance with such accuracy, and it brings a city-sized quantum network closer to reality — even though there are still years of work ahead to make that possible. As well as promising huge boosts in speed and computational power, a quantum internet would be ultra-secure — any hacking attempt would be as good as destroying the lock being picked.