Abstract
In the standard formulation of quantum mechanics, there exists an inherent feedback of the measurement setting on the elementary object under scrutiny. Thus one cannot assume that an ‘element of reality’ prexists to the measurement and, it is even more intriguing that unperformed/counterfactual observables enter the game. This is called quantum contextuality. Simple finite projective geometries are a good way to picture the commutation relations of quantum observables entering the context, at least for systems with two or three parties. In the essay, it is further discovered a mathematical mechanism for ‘drawing’ the contexts. The so-called ‘dessins d’enfants’ of the celebrated mathematician Alexandre Grothendieck feature group, graph, topological, geometric and algebraic properties of the quantum contexts that would otherwise have been ‘hidden’ in the apparent randomness of measurement outcomes.
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Planat, M. (2015). Drawing Quantum Contextuality with ‘Dessins d’enfants’. In: Aguirre, A., Foster, B., Merali, Z. (eds) It From Bit or Bit From It?. The Frontiers Collection. Springer, Cham. https://doi.org/10.1007/978-3-319-12946-4_4
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