Demonstration of quantum-digital payments. (arXiv:2305.14504v1 [quant-ph])

Digital contactless payments have replaced physical banknotes in many aspects
of our daily lives. Similarly to banknotes, they are easy to use, unique,
tamper-resistant and untraceable, but additionally have to withstand attackers
and data breaches in the digital world. Current technology substitutes
customers' sensitive data by randomized tokens, and secures the uniqueness of
each digital purchase with a cryptographic function, called a cryptogram.
However, computationally powerful attacks violate the security of these
functions. Quantum technology, on the other hand, has …

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