Abstract
Account of a system may depend on available methods of gaining information. We discuss a simple discrete system whose description is affected by a specific model of measurement and transformations. It is shown that the limited means of investigating the system make the epistemic account of the model indistinguishable from a constrained version of a qubit corresponding to the convex hull of eigenstates of Pauli operators, Clifford transformations and Pauli observables. ► Construction of discrete analogue of a constrained qubit. ► Description of the model in the Hilbert space and proof of equivalence. ► Discussion of the two-fold character of epistemic restrictions.
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