Exotic complex Hadamard matrices and their equivalence
Exotic complex Hadamard matrices and their equivalence
复制标题
奇异复数 Hadamard 矩阵及其等价
DOI:
10.1007/s12095-010-0021-3
复制
发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Ferenc Szöllősi
中科院分区:
文献类型:
--
作者:
Ferenc Szöllősi
In this paper we use a design theoretical approach to construct new, previously unknown complex Hadamard matrices. Our methods generalize and extend the earlier results of de la Harpe and Jones (C R Acad Sci Paris 311(Série I): 147–150, 1990), and Munemasa and Watatani (C R Acad Sci Paris 314(Série I): 329–331, 1992) and offer a theoretical explanation for the existence of some sporadic examples of complex Hadamard matrices in the existing literature. As it is increasingly difficult to distinguish inequivalent matrices from each other, we propose a new invariant, the fingerprint of complex Hadamard matrices. As a side result, we refute a conjecture of Koukouvinos et al. on (n − 8)×(n − 8) minors of real Hadamard matrices (Koukouvinos et al., Linear Algebra Appl 371:111–124, 2003).