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A new inequality for the von Neuman entropy

Linden, N (Bristol)
Thursday 26 August 2004, 16:20-17:10

Seminar Room 1, Newton Institute


Strong subadditivity of von Neumann entropy, proved in 1973 by Lieb and Ruskai, is a cornerstone of quantum coding theory. All other known inequalities for entropies of quantum systems may be derived from it. I will describe some work with Andreas Winter in which we prove a new inequality for the von Neumann entropy which is independent of strong subadditivity. This work sheds light on extremal types of entanglement for multi-party quantum states.


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