Unhackable telecom networks come a step closer
But the detector, which is able to filter out the 'noise' in the fibre caused by the data itself, avoids the cost of laying down dedicated optical fibre lines.
Previous work has managed to use quantum cryptography on shared optical fibres but only over very short distances, with low capacity rates, or with data moving only in one direction.
The researchers say their system can do it over 50 km with data moving back and forth and an encryption capacity 50,000 times the record over the same distance.
Zhiliang Yuan, who worked on the research, told Reuters the team plan to carry out field tests on the system but he predicted it could be rolled out commercially within a few years.
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