量子多拷贝复制的若干界限
量子物理
2007-05-23 v2
摘要
我们研究了态依赖的 N=>L 克隆的相对误差。复制变换和态空间维数均未指定。仅使用了量子力学变换的酉性。所提出的方法基于两态之间夹角的概念。首先，讨论了两态之间夹角的概念。考察了多拷贝复制相对误差的下界。此外，接着研究了绝对误差的下界。我们将所得界限与全局保真度最大化的情况进行了比较。
引用
@article{arxiv.quant-ph/0111085,
title = {Some bounds for quantum copying with multiple copies},
author = {A. E. Rastegin},
journal= {arXiv preprint arXiv:quant-ph/0111085},
year = {2007}
}
备注
10 pages, ReVTeX, 2 figures. The paper is reorganized. To make the paper clearer, many parts are recast. Some lengthy fragments are deleted. The notion of the relative error is better motived. The figures are replaced. Three references are added. In sequence to quant-ph/0108014