约化态唯一确定原始纯态的 Grover 纠缠度
量子物理
2008-06-18 v2
摘要
n 方纯态的 Grover 纠缠度和几何纠缠度可直接由 (n-1) 方约化态密度算符表示。该主定理导出了若干重要推论。首先,如果两个纯 n-夸比特态具有在局域幺正 (LU) 变换下等价的 (n-1)-夸比特约化态,则它们具有相等的 Grover 纠缠度和几何纠缠度。其次,这两种度量对纯态均存在上界,但该上界仅在两量子比特系统中达到。第三,它有效地将三量子比特 Grover 纠缠度的非线性本征值问题转化为线性本征值方程。本文显式写出了这些线性方程的一些典型解,并详细讨论了一般解的特征。
引用
@article{arxiv.0709.4292,
title = {Reduced State Uniquely Defines Groverian Measure of Original Pure State},
author = {Eylee Jung and Mi-Ra Hwang and Hungsoo Kim and Min-Soo Kim and DaeKil Park and Jin-Woo Son and Sayatnova Tamaryan},
journal= {arXiv preprint arXiv:0709.4292},
year = {2008}
}
备注
title is changed, proofs are generalized to qudits and simplified, new analytic and numeric results are presented, new references are added, PRA version