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Author Correction: Demonstration of quantum-digital payments - Nature Communications
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The original version of this Article contained an error in the Discussion section, 4 th paragraph, 6 th sentence, which incorrectly read ‘Remarkably, we can amend our protocol such that the number of purchases is not bounded by the MAC function: the Client simply encrypts a new random key R with C , and forwards the result along with the cryptogram to the TTP.’ The correct version is ‘We can amend our protocol such that the number of purchases is not bounded by the MAC function, by growing C during the payment process: when the Client receives a new quantum token P 〉, we append additional quantum states for QKD, and use the cryptogram κ for authentication.’ .
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