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...

Source URL: https://www.sciencenews.org/article/take-time-break-quantum-encryption