4 papers · 1 filter
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…
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…
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…
How much secure randomness is in a quantum state?
Kriss Gutierrez Anco, Tristan Nemoz, Peter Brown
How much cryptographically-secure randomness can be extracted from a quantum state? This fundamental question probes the absolute limits of quantum random number generation (QRNG)…