Kochen-Specker theorem for a single qubit using positive operator-valued measures.
A proof of the Kochen-Specker theorem for a single two-level system is presented. It employs five eight-element positive operator-valued measures and a simple algebraic reasoning based on the geometry of the dodecahedron.
Cabello
Adán
A
Departamento de Física Aplicada II, Universidad de Sevilla, 41012 Sevilla, Spain. adan@us.es