Indefinite causal order without post-selection

          @misc{ pirsa_PIRSA:19120044,
            doi = {10.48660/19120044},
            url = {https://pirsa.org/19120044},
            author = {Ried, Katja},
            keywords = {Quantum Foundations, Quantum Gravity, Quantum Information},
            language = {en},
            title = {Indefinite causal order without post-selection},
            publisher = {Perimeter Institute},
            year = {2019},
            month = {dec},
            note = {PIRSA:19120044 see, \url{https://pirsa.org}}
          }
          

Abstract

The possibility of indefinite causal order has garnered considerable interest in recent years, both for its promise as a resource, e.g. for communication, and for its role in exploring the fundamental physical constraints on causal structure. In order to gain a better understanding of the phenomenon, one approach is to design experiments that implement – or at least simulate – scenarios with indefinite causal order. While post-selection is one way to simulate exotic causal structures, this approach may not provide the desired insights. Instead, I will discuss how one might go about implementing indefinite causal order without post-selection.