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Quantum mutual information and the one-time pad

Benjamin Schumacher, Michael D. Westmoreland

quant-pharXiv:quant-ph/0604207

Abstract

Alice and Bob share a correlated composite quantum system AB. If AB is used as the key for a one-time pad cryptographic system, we show that the maximum amount of information that Alice can send securely to Bob is the quantum mutual information of AB.

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