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Some attempts at proving the non-existence of a full set of mutually unbiased bases in dimension 6

Complete sets of mutually unbiased bases are only known to exist in prime-power dimensions. We will describe a few approaches to the problem proving the (non)-existence of four mutually unbiased bases in dimension 6. These will include the notions of Grassmannian distance, quadratic matrix programming, semidefinite relaxations to polynomial programming, as well as various tools from algebraic geometry.

preprint2010arXivOpen access
Guo Chuan Thiang
math-phmath.MPquant-ph
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Guo Chuan Thiang

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