3 papers
quant-ph2026
Chain rules for conditional entropies in quantum cryptography: limitations and improvements
Lewis Wooltorton, Peter Brown, Omar Fawzi
Security proofs in quantum cryptography rely on conditional entropies. In a many-round protocol, their estimation is a challenging task; one must account for the most general attac…
quant-ph2026
Exact distinguishability between real-valued and complex-valued Haar random quantum states
Tristan Nemoz, Romain Alléaume, Peter Brown
Haar random states are fundamental objects in quantum information theory and quantum computing. We study the density matrix resulting from sampling copies of a -dimensional…
quant-ph2025
Hybrid Quantum Cryptography from Communication Complexity
Francesco Mazzoncini, Balthazar Bauer, Peter Brown +1
We introduce an explicit construction for a key distribution protocol in the Quantum Computational Timelock (QCT) security model, where one assumes that computationally secure encr…