Quantum vault stores token copies at the bank to enable secure authentication without classical side information, achieving false-negative errors below 10^{-4} and attack success below 10^{-18} for 200-token bills on IBMQ hardware.
Ferrazzini, Quantum, diplomacy, and geopolitics (2026), arXiv:2512.06052 [physics.soc-ph]
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Quantum Vault: Secure Token Authentication Without Classical State Information Benchmarked on IBMQ
Quantum vault stores token copies at the bank to enable secure authentication without classical side information, achieving false-negative errors below 10^{-4} and attack success below 10^{-18} for 200-token bills on IBMQ hardware.