Long-Range QKD Without Trusted Nodes is Not Possible With Current Technology

Nature npj Quantum Information - A recently published patent has claimed the development of a novel quantum key distribution protocol purporting to achieve long-range quantum security without trusted nodes and without use of quantum repeaters.

We have investigated the claim that the ARQ19 protocol can achieve long-range quantum security without TNs. More specifically, the claim is that using this protocol, two distant users could exchange provably secure keys through an untrusted satellite node. As far as we are aware, this claim has not been validated by a suitable public disclosure in a scientific journal.

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