PIRSA:26030084

On the noncausality – local indistinguishability equivalence and beyond

(2026). On the noncausality – local indistinguishability equivalence and beyond. Perimeter Institute. https://pirsa.org/26030084

On the noncausality – local indistinguishability equivalence and beyond. Perimeter Institute, Mar. 16, 2026, https://pirsa.org/26030084 

          @misc{ pirsa_PIRSA:26030084,
            doi = {10.48660/26030084},
            url = {https://pirsa.org/26030084},
            author = {},
            keywords = {Quantum Foundations},
            language = {en},
            title = {On the noncausality {\textendash} local indistinguishability equivalence and beyond},
            publisher = {Perimeter Institute},
            year = {2026},
            month = {mar},
            note = {PIRSA:26030084 see, \url{https://pirsa.org}}
          }
Hippolyte Dourdent
Talk numberPIRSA:26030084
DOI10.48660/26030084
Collection
Talk Type Scientific Series
Subject

Abstract

Local indistinguishability - often called "quantum nonlocality without entanglement" (QNLWE) - describes the counterintuitive situation where orthogonal product states cannot be discriminated by local operations and classical communication (LOCC). Kunjwal and Baumeler [PRL 131, 120201 (2023)] showed that this limitation can be traded against definite causal order while preserving classical communication, establishing an equivalence between the tripartite noncausal "Lugano" process and the QNLWE "SHIFT" basis, and showing that all Boolean process functions -- logically consistent multipartite classical communications that may violate causal inequalities -- without a global past map onto a QNLWE basis.