Quantum Money Generated by Multiple Untrustworthy Banks. (arXiv:2205.09303v1 [quant-ph])

While classical money can be copied, it is impossible to copy quantum money
in principle, with only the bank that issues it knowing how to generate it,
meaning only the bank can make exact copies. Not all reliable banks, such as
central banks, will issue quantum money, so there is the possibility that
untrustworthy banks are distributing fake or multiple copies of the same
quantum money without the users' knowledge. As such, we propose a quantum
patchwork money scheme in …

banks money quantum