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quant-ph2026
More is Less:Optimal Security for Haar Quantum Money and More
Zihan Hao, Xingjian Li, Qipeng Liu +1
Quantum cryptography leverages unclonability to enable a wide range of cryptographic applications that are impossible classically, such as digital currency protected against counte…
quant-ph2026
Impossibility of Perfectly Complete Many-Round Key Agreement in the QROM
Longcheng Li, Qian Li, Xingjian Li +1
This paper proves that it is impossible to construct perfectly complete quantum key agreement protocols (QKA) from quantumly secure one-way functions (OWFs) in a black-box manner.…
quant-ph2026
Single-sideband-interference twin-field quantum key distribution without global phase locking
Xingjian Li, Bingkun Wang, Jianyong Hu +10
Twin-field quantum key distribution (TF QKD) can overcome the fundamental rate loss limit of repeaterless quantum links, but its practical deployment has long been hindered by the…