DECOMPOSITION AND PARTIAL TRACE OF POSITIVE MATRICES WITH HERMITIAN BLOCKS

被引:12
|
作者
Bourin, J-C. [1 ]
Lee, Eun-Young [2 ]
机构
[1] Univ Franche Comte, Math Lab, F-25000 Besancon, France
[2] Kyungpook Natl Univ, Dept Math, Taegu 702701, South Korea
基金
新加坡国家研究基金会;
关键词
Positive definite matrices; norm inequalities; partial trace; separable state; STATES;
D O I
10.1142/S0129167X13500109
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
Let H = [A(s, t)] be a positive definite matrix written in beta x beta Hermitian blocks and let Delta = A(1,1) + ... + A(beta, beta) be its partial trace. Assume that beta = 2(p) for some p is an element of N. Then, up to a direct sum operation, H is the average of beta matrices isometrically congruent to Delta. A few corollaries are given, related to important inequalities in quantum information theory such as the Nielsen-Kempe separability criterion.
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页数:13
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