Quantum counterfeiters might succeed

Money encoded by photons should be secure, but physicists find loophole

quantum money

QUANTUM CASH  Physicists have created quantum money by encoding data with light. The researchers transmitted a quantum version (right) of a real bill, an old Austrian banknote (left). Each grayscale shade in the quantum bill corresponds to a different photon polarization.

K. Bartkiewicz et al/npj Quantum Information 2017

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