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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.

If banks were to use the new scheme they could send messages that could not be read outside a certain room, confident that only an eavesdropper who had smuggled a quantum receiver inside that room could intercept it, says its inventor Robert Malaney at the University of New South Wales in Sydney, Australia.

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