Preprint
Sep 2026
More is Less:Optimal Security for Haar Quantum Money and More
Quantum cryptography leverages unclonability to enable a wide range of cryptographic applications that are impossible classically, such as digital currency protected against counterfeiting by quantum mechanics. Security requires that no efficient user can produce even one additional valid banknote beyond those already...
Zi-Han Hao, Xing-Jian Li, Qi-Peng Liu et al.
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