Towards a classification of $6\times 6$ complex Hadamard matrices

Details Towards a classification of $6\times 6$ complex Hadamard matrices Towards a classification of $6\times 6$ complex Hadamard matrices

2007-02-02

arxiv.org/abs/math/0702043v1

Mathematics

Classical Analysis and ODEs

14 pages

Scientific paper

Complex Hadamard matrices have received considerable attention in the past few years due to their appearance in quantum information theory. While a complete characterization is currently available only up to order 5 (in \cite{haagerup}), several new constructions of higher order matrices have appeared recently \cite{dita, karol, BN, MM, sz}. In particular, the classification of {\it self-adjoint} complex Hadamard matrices of order 6 was completed by Beuachamp and Nicoara in \cite{BN}, providing a previously unknown non-affine one-parameter orbit. In this paper we classify all \emph{dephased, symmetric} complex Hadamard matrices \emph{with real diagonal} of order 6. Furthermore, relaxing the condition on the diagonal entries we obtain a new non-affine one-parameter orbit connecting the Fourier matrix $F_6$ and Di\c{t}\u{a}'s matrix $D_6$. This answers a recent question of Bengtsson & al. in \cite{BB}.

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