The HSW channel capacity for the diagonal unital qudit channels

被引：0

作者：

Wu, YC ^{[1
]}

Zhou, ZW ^{[1
]}

Guo, GC ^{[1
]}

机构：

[1] Univ Sci & Technol China, CAS, Key Lab Quantum Informat, Anhua 230026, Peoples R China

来源：

INTERNATIONAL JOURNAL OF QUANTUM INFORMATION | 2004年 / 2卷 / 04期

关键词：

HSW channel capacity; diagonal unital qudit channel; von Neumann entropy;

D O I：

10.1142/S021974990400047X

中图分类号：

TP301 [理论、方法];

学科分类号：

081202 ;

摘要：

The Holevo-Schumacher-Westermoreland (HSW) channel capacity for the diagonal unital qudit channels is considered. In Phys. Rev. A69, 022302, the HSW channel capacity for the diagonal unital qudit channels Phi is given as chi(Phi) = 1 - min(rho)H(Phi(rho)), where minimization is over the input states of the channel. In this paper, using the concavity of von Neumann entropy, we show that using only pure states we can work out its HSW channel capacity. Hence, our result simplifies the computation.

引用

页码：489 / 493

页数：5

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