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Quantum Internet.

The dream of many a security expert, it's a concept that uses the laws of quantum mechanics to create perfectly secure online communication. The idea is that measuring a characteristic of a quantum object—like a photon—always changes it, so attempts to intercept messages screws them up and renders them incomprehensible.

Problem is, most quantum internet solutions only allow messages to be sent between two locations, and not routed elsewhere. That's because working out where it's supposed to be routed changes the state of the quantum message and turns it into junk.

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