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arXiv · 2202.00600

Dimension towers of SICs. II. Some constructions

Ingemar Bengtsson·Basudha Srivastava
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Abstract

A SIC is a maximal equiangular tight frame in a finite dimensional Hilbert space. Given a SIC in dimension $d$, there is good evidence that there always exists an aligned SIC in dimension $d(d-2)$, having predictable symmetries and smaller equiangular tight frames embedded in them. We provide a recipe for how to calculate sets of vectors in dimension $d(d-2)$ that share these properties. They consist of maximally entangled vectors in certain subspaces defined by the numbers entering the $d$ dimensional SIC. However, the construction contains free parameters and we have not proven that they can always be chosen so that one of these sets of vectors is a SIC. We give some worked examples that, we hope, may suggest to the reader how our construction can be improved. For simplicity we restrict ourselves to the case of odd dimensions.

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Ingemar Bengtsson, Basudha Srivastava. 2022-02-01. Dimension towers of SICs. II. Some constructions. https://doi.org/10.1088/1751-8121%2Fac6402

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