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Researchers have implemented a new quantum encryption method that, in principle, may provide the ultimate security against hackers in real-world cryptography applications.

Quantum cryptography holds promise for communication schemes that are, in theory, perfectly secure. But in the last few years, hackers have exploited security loopholes to crack some of the most sophisticated quantum encryption systems. Fortunately, two new papers in Physical Review Letters, one by Allison Rubenok, at the Institute for Quantum Science & Technology in Calgary, Canada, and colleagues [1] and the other by Yang Liu, at the Hefei National Laboratory for Physical Sciences and the University of Science and Technology of China, and colleagues [2] now report a new quantum encryption method that can remove the weakest link of quantum encryption schemes: loopholes associated with defects of the photodetectors used at the receiver end. Code makers have now regained the upper hand against code breakers.

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