One of the biggest commercial uses for quantum cryptography to date has been to securely exchange keys. Unlike traditional key distribution techniques, using quantum mechanics offers a seemingly foolproof upside: any attempt by an attacker to measure quantum data disturbs it -- per the Heisenberg uncertainty principle -- which a quantum cryptography system can detect, thus ensuring that communications remain secure.
Enter the laser. The team of researchers from the Norwegian University of Science and Technology (NTNU), the University of Erlangen-N
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