We show that the extended Bloch representation of quantum mechanics also applies to infinite-dimensional entities, to the extent that the number of (possibly infinitely degenerate) outcomes of a measurement remains finite, which is always the case in practical situations.

Aerts, D. & Sassoli de Bianchi, M. (2019). The Extended Bloch Representation of Quantum Mechanics for Infinite-Dimensional Entities. In: Probing the Meaning of Quantum Mechanics. Information, Contextuality, Relationalism and Entanglement. D. Aerts, M.L. Dalla Chiara, C. de Ronde & D. Krause (eds.) World Scientific, pp. 11-25. Doi: 10.1142/9789813276895_0002.