**Weighted complex projective 2-designs from bases** - Aidan Roy

We introduce the problem of constructing weighted complex projective
2-designs from the union of a family of orthonormal bases. If the weight remains
constant across elements of the same basis, then such designs can be
interpreted as generalizations of complete sets of mutually unbiased bases,
being equivalent whenever the design is composed of d+1 bases in dimension
d. We show that, for the purpose of quantum state determination, these designs
specify an optimal collection of orthogonal measurements. Using highly
nonlinear functions on abelian groups, we construct explicit examples from
d+2 orthonormal bases whenever d+1 is a prime power, covering dimensions
d=6, 10, and 12, for example, where no complete sets of mutually unbiased bases
have thus far been found. This is joint work with Andrew Scott.