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Isaac Newton Institute for Mathematical Sciences

Special Week on Quantum Cryptography

Non-local correlations and key distribution

Author: Jonathan Barrett (Universite de Bruxelles Libre)


We present a quantum key distribution scheme that is secure even against eavesdroppers who can break the laws of quantum mechanics, as long as superluminal signalling is impossible. The scheme is based on violation of a Bell inequality, and its security stems from the fact that non-local correlations are monogamous, in analogy with the monogamy of entanglement.