On trace inequalities and their applications to noncommutative communication theory

Details On trace inequalities and their applications to noncommutative communication theory On trace inequalities and their applications to noncommutative communication theory

2004-03-26

arxiv.org/abs/quant-ph/0403187v2

Linear Algebra and its Applications, Volume 395, 15 January 2005, Pages 351-359

Physics

Quantum Physics

8 pages

Scientific paper

Certain trace inequalities related to matrix logarithm are shown. These results enable us to give a partial answer of the open problem conjectured by A.S.Holevo. That is, concavity of the auxiliary function which appears in the random coding exponent as the lower bound of the quantum reliability function for general quantum states is proven in the case of $0\leq s\leq 1$.

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