Quantum mutual information and the one-time pad
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.
Schumacher, Benjamin and Westmoreland, Michael, "Quantum mutual information and the one-time pad" (2006). Physical Review A 74(4): 42305-. Faculty Publications. Paper 285.
Physical Review A