Severini, S; (2002) On the Cayley digraphs that are patterns of unitary matrices.
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A digraph D is the pattern of a matrix M when D has an arc ij if and only if the ij-th entry of M is nonzero. Study the relationship between unitary matrices and their patterns is motivated by works in quantum chaology and quantum computation. In this note, we prove that if a Cayley digraph is a line digraph then it is the pattern of a unitary matrix. We prove that for any finite group with two generators there exists a set of generators such that the Cayley digraph with respect to such a set is a line digraph and hence the pattern of a unitary matrix.
|Title:||On the Cayley digraphs that are patterns of unitary matrices|
|Keywords:||math.CO, math.CO, quant-ph|
|UCL classification:||UCL > School of BEAMS > Faculty of Engineering Science > Computer Science|
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