Extremal Quantum Correlations and Cryptographic Security

TitleExtremal Quantum Correlations and Cryptographic Security
Publication TypeJournal Article
Year of publication2010
AuthorsFranz, T., F. Furrer, and R. F. Werner
JournalPhys. Rev. Lett.
Date published10/2010

We investigate fundamental properties of device independent security in quantum cryptography and show a one-to-one correspondence between extremal and secure probability distributions. This allows us to give a characterization of security in algebraic terms. We apply the method to common examples for two-party as well as multi-party setups and present a scheme for verifying the security of correlations with two parties, two measurement settings, and two outcomes.