30 May '12, 8pm

Quantum Cash and the End of Counterfeiting

Illustration: Emily Cooper Click on image to enlarge. Since the invention of paper money, counterfeiters have churned out fake bills. Some of their handiwork, created with high-tech inks, papers, and printing presses, is so good that it’s very difficult to distinguish from the real thing. National banks combat the counterfeiters with difficult-to-copy watermarks, holograms, and other sophisticated measures. But to give money the ultimate protection, some quantum physicists are turning to the weird quirks that govern nature’s fundamental particles. At the moment, the idea of “quantum money” is very much on the drawing board. That hasn’t stopped researchers from pondering what encryption schemes they might apply for it, or from wondering how the technologies used to create quantum states could be shrunk down “to the point of fitting it in your wallet,” says Scott Aaronson , ...

Full article: http://spectrum.ieee.org/computing/software/quantum-cash-...

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