QI/AMO Seminar: "Generalized contextuality as our best notion of nonclassicality (and applications to state discrimination)"
(sign-up)David Schmid, University of Waterloo
|Event Contact:||Betsy Greifenkamp
Department of Physics
Contextuality places strong constraints on our understanding of quantum theory and of nature. In this seminar, I will give a gentle introduction to the generalized notion of noncontextuality defined by Spekkens, and then discuss how contextuality subsumes various other definitions of nonclassicality. The generalized formulation of noncontextuality allows one to make principled claims that a set of phenomena are nonclassical; that is, one can derive no-go theorems proving that a set of observable statistics cannot be modeled by any noncontextual ontological model. I will discuss how these ideas help us quantify the sense in which the world is truly nonclassical, and then I will apply these ideas to the task of state discrimination. Namely, I show that the failure of noncontextuality allows an agent to better discriminate between states than is possible in any noncontextual ontological model. In other words, I show that contextuality is a resource for state discrimination.
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