Enhancing Non-Classicality Detection with Interventions

          @misc{ pirsa_PIRSA:24090096,
            doi = {10.48660/24090096},
            url = {https://pirsa.org/24090096},
            author = {Chaves, Rafael},
            keywords = {Quantum Foundations, Quantum Information},
            language = {en},
            title = {Enhancing Non-Classicality Detection with Interventions},
            publisher = {Perimeter Institute},
            year = {2024},
            month = {sep},
            note = {PIRSA:24090096 see, \url{https://pirsa.org}}
          }
          

Abstract

Generalizations of Bell's theorem, particularly within quantum networks, are now being analyzed through the causal inference lens. However, the use of interventions, a central concept in causality theory, remains unexplored. As will be discussed, if we are not limited to observational data and can intervene in our experimental setup, we can witness quantum violations of classical causal bounds even when no Bell-like violation is possible. Through interventions, the quantum behavior of a system, that would seem classical otherwise, can be demonstrated. We will then present a photonic experiment implementing those ideas and consider applications of this framework for measurement-based quantum computation, quantification of causality in quantum gates and quantum network protocols.