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The problem with messages is that you can't be sure who might pick them up at the other end. But a new scheme for a quantum communications link will allow a sender to relax in the knowledge that only a recipient in exactly the right location can read their message.
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Vadim Makarov at the Norwegian University of Science and Technology in Trondheim says it is exciting to hear about the discovery of a new facet to quantum communications, because "this does not happen very often".
The new idea should be feasible using existing techniques, says Makorov, but the limitations of photon detectors and optical fibre might lead to errors in confirming a recipient's location, he adds.
Malaney says such problems are not serious. "It would only make the error a little bigger: instead of knowing where Bank B is to within 2 metres, it might be within 20 metres."