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arXiv 1109.2197quant-ph
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量子信道的统一熵表征

On unified-entropy characterization of quantum channels

Alexey E. Rastegin

摘要:

我们利用统一熵研究了量子信道的性质。考察了量子信道相对于这些熵的极值解。在统一熵的基础上推广了映射熵的概念。映射$(q,s)$ -熵被自然地定义为给定量子信道的重标度动力学矩阵的统一的$(q,s)$ -熵。对于引入的熵,得到了相应的动力矩阵之间的差的迹和Frobenius范数的Fannes型不等式。讨论了引入的映射熵的可加性性质。将已知的Lindblad不等式与熵交换推广到许多统一熵。对于一对量子信道的张量积,导出了最大纠缠输入态输出熵的双边估计。

英文摘要:

We consider properties of quantum channels with use of unified entropies. Extremal unravelings of quantum channel with respect to these entropies are examined. The concept of map entropy is extended in terms of the unified entropies. The map $(q,s)$-entropy is naturally defined as the unified $(q,s)$-entropy of rescaled dynamical matrix of given quantum channel. Inequalities of Fannes type are obtained for introduced entropies in terms of both the trace and Frobenius norms of difference between corresponding dynamical matrices. Additivity properties of introduced map entropies are discussed. The known inequality of Lindblad with the entropy exchange is generalized to many of the unified entropies. For tensor product of a pair of quantum channels, we derive two-sided estimating of the output entropy of a maximally entangled input state.

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