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arXiv 0903.2895quant-phmath-phmath.MP
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关于相对熵凸性及相关迹函数的统一处理及其相等条件

A Unified Treatment of Convexity of Relative Entropy and Related Trace Functions, with Conditions for Equality

Anna Jencova, Mary Beth Ruskai

摘要:

我们介绍了一个推广的相对熵来自Wigner-Yanase-Dyson熵,并给出了一个简单的,自足的证明,它是凸的。此外,特殊情况产生了相对熵的联合凸性,并且对于映射(A,B)--> Tr K^* A^p K B^{1-p},0 < p < 1时是Lieb的联合凸性,1 < p < 2时是Ando的联合凸性。这种方法使我们能够获得这些情况下的平等条件,以及由此产生的一些不平等的平等条件。其中包括部分迹下的单调性,以及由Lieb和Carlen证明的关于混合(p,q)范数的Minkowski型矩阵不等式。在所有情况下,等式条件与p无关;对于三个空间的扩张,它们与相对熵的强次可加性中的等式条件相同。

英文摘要:

We introduce a generalization of relative entropy derived from the Wigner-Yanase-Dyson entropy and give a simple, self-contained proof that it is convex. Moreover, special cases yield the joint convexity of relative entropy, and for the map (A,B) --> Tr K^* A^p K B^{1-p} Lieb's joint concavity for 0 < p < 1 and Ando's joint convexity for 1 < p < 2. This approach allows us to obtain conditions for equality in these cases, as well as conditions for equality in a number of inequalities which follow from them. These include the monotonicity under partial traces, and some Minkowski type matrix inequalities proved by Lieb and Carlen for mixed (p,q) norms. In all cases the equality conditions are independent of p; for extensions to three spaces they are identical to the conditions for equality in the strong subadditivity of relative entropy.

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