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A rigorous proof that quantum cryptography dies at 25 percent noise or 500 kilometers of fiber. Even theoretically unbreakable secrets have a remarkably short leash. https:// journals.aps.org/prl/abst

A rigorous proof that quantum cryptography dies at 25 percent noise or 500 kilometers of fiber. Even theoretically unbreakable secrets have a remarkably short leash. https:// journals.aps.org/prl/abstract/ 10.1103/3bgy-tpy9

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