Transition behavior in the channel capacity of two-quibit channels with memory

被引：86

作者：

Macchiavello, C

Palma, GM

Virmani, S

机构：

[1] Dipartimento Fis A Volta, I-27100 Pavia, Italy

[2] INFM, I-27100 Pavia, Italy

[3] Univ Milan, Dipartimento Tecnol Informaz, INFM, NEST, I-26013 Crema, CR, Italy

[4] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Dept Phys, QOLS, London SW7 2BW, England

[5] Univ Hertfordshire, Dept Comp Sci, Hatfield AL10 9AB, Herts, England

来源：

PHYSICAL REVIEW A | 2004年 / 69卷 / 01期

关键词：

D O I：

10.1103/PhysRevA.69.010303

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We prove that a general upper bound on the maximal mutual information of quantum channels is saturated in the case of Pauli channels with an arbitrary degree of memory. For a subset of such channels we explicitly identify the optimal signal states. We show analytically that for such a class of channels entangled states are indeed optimal above a given memory threshold.

引用

页数：4

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