On the system loophole of generalized noncontextuality

Understand

Generalized noncontextuality is a well-studied notion of classicality that is applicable to a single system, as opposed to Bell locality.

• It relies on representing operationally indistinguishable procedures identically in an ontological model.
• However, operational indistinguishability depends on the set of operations that one may use to distinguish two procedures: we refer to this set as the reference of indistinguishability.
• Thus, whether or not a given experiment is noncontextual depends on the choice of reference.