A complete set of mutually unbiased bases for a Hilbert space of dimension N is analogous in some respects to a certain finite geometric structure, namely, an affine plane. Another kind of quantum measurement, known as a symmetric informationally complete positive-operator-valued measure, is, remarkably, also analogous to an affine plane, but with the roles of points and lines interchanged. In this paper I present these analogies and ask whether they shed any light on the existence or non-existence of such symmetric quantum measurements for a general quantum system with a finite-dimensional state space.
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Wootters, W.K. Quantum Measurements and Finite Geometry. Found Phys 36, 112–126 (2006). https://doi.org/10.1007/s10701-005-9008-x
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DOI: https://doi.org/10.1007/s10701-005-9008-x