Take the time to break quantum encryption
The feat is theoretically possible thanks to a time-travel scenario permitted by Einstein’s general theory of relativity
By Rachel Ehrenberg, 15:28 PM November 12, 2008
Quantum physics offers James Bond and his ilk much more than a bit of solace—it permits quantum encryption, a completely spyproof way to send coded information. Eavesdropping by a third party can always be detected.
But now physicists have suggested that quantum codes may be breakable. The feat involves a trick that even Bond hasn’t mastered yet — time travel. By taking advantage of hidden paths to the past — routes that are predicted by some of Einstein’s equations — a nemesis could eavesd...
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