A mechanistic macroscopic physical entity with a three-dimensional Hilbert space description

Aerts, Diederik; Coecke, Bob; D'Hooghe, Bart; Valckenborgh, Frank

A mechanistic macroscopic physical entity with a three-dimensional Hilbert space description

Authors

Description

It is sometimes stated that Gleason's theorem prevents the construction of hidden-variable models for quantum entities described in a more than two-dimensional Hilbert space. In this paper however we explicitly construct a classical (macroscopical) system that can be represented in a three-dimensional real Hilbert space, the probability structure appearing as the result of a lack of knowledge about the measurement context. We briefly discuss Gleason's theorem from this point of view.
11 pages, 5 figures