PIRSA:22110079

Video URL

https://pirsa.org/22110079

On the system loophole of generalized noncontextuality

Gitton, V. (2022). On the system loophole of generalized noncontextuality. Perimeter Institute for Theoretical Physics. https://pirsa.org/22110079

Gitton, Victor. On the system loophole of generalized noncontextuality. Perimeter Institute for Theoretical Physics, Nov. 09, 2022, https://pirsa.org/22110079 

          @misc{ scivideos_PIRSA:22110079,
            doi = {10.48660/22110079},
            url = {https://pirsa.org/22110079},
            author = {Gitton, Victor},
            keywords = {Quantum Foundations},
            language = {en},
            title = {On the system loophole of generalized noncontextuality},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2022},
            month = {nov},
            note = {PIRSA:22110079 see, \url{https://scivideos.org/index.php/pirsa/22110079}}
          }

Victor Gitton ETH Zurich

Talk numberPIRSA:22110079
DOI10.48660/22110079
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

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. The choices of references appearing in the literature are seldom discussed, but typically relate to a notion of system underlying the experiment. This shift in perspective then begs the question: how should one define the extent of the system underlying an experiment? Our paper primarily aims at exposing this question rather than providing a definitive answer to it. We start by formulating a notion of relative noncontextuality for prepare-and-measure scenarios, which is simply noncontextuality with respect to an explicit reference of indistinguishability. We investigate how verdicts of relative noncontextuality depend on this choice of reference, and in the process introduce the concept of the noncontextuality graph of a prepare-and-measure scenario. We then discuss several proposals that one may appeal to in order to fix the reference to a specific choice, and relate these proposals to different conceptions of what a system really is.

arXiv link:  https://arxiv.org/abs/2209.04469

Zoom link:  https://pitp.zoom.us/j/97393198973?pwd=dWhCOUJQLytxeXVIVmEvOHRnRHc1QT09