Reconfigurable intelligent surfaces (RISs) are one of the foremost technological enablers of
future wireless systems. They improve communication and localization by providing a strong …

We analyze the set of real and complex Hadamard matrices with additional symmetry
constrains. In particular, we link the problem of existence of maximally entangled multipartite …

A family of two-unitary complex Hadamard matrices (CHMs) of size 36 stemming from a
particular matrix is constructed. Every matrix in this orbit remains unitary after operations of …

12 A survey of group invariant Butson matrices and their relation to generalized bent functions
and various other objects Page 1 Bernhard Schmidt 12 A survey of group invariant Butson …

Some combinatorial designs, such as Hadamard matrices, have been extensively
researched and are familiar to readers across the spectrum of Science and Engineering …

A new method of obtaining a sequence of isolated complex Hadamard matrices (CHM) for
dimensions N⩾ 7, based on block-circulant structures, is presented. We discuss several …

In this paper we study Butson Hadamard matrices, and codes over finite rings coming from
these matrices in logarithmic form, called BH-codes. We introduce a new morphism of …

Let K be a finite abelian group and let exp⁡(K) denote the least common multiple of the
orders of the elements of K. A BH (K, h) matrix is a K-invariant| K|×| K| matrix H whose entries …

Let p be an odd prime, let a be a positive integer, let m be an odd positive integer, and
suppose that a generalized bent function from Z 2 pam to Z 2 pa exists. We show that this …

We explore the set of unitary matrices characterized by a given structure in the context of
their applications in the field of Quantum Information. In the first part of the Thesis we focus …