PIRSA:22060002

Quantum nonlocality without entanglement via indefinite causal order

Kunjwal, R. (2022). Quantum nonlocality without entanglement via indefinite causal order. Perimeter Institute. https://pirsa.org/22060002

Kunjwal, Ravi. Quantum nonlocality without entanglement via indefinite causal order. Perimeter Institute, Jun. 17, 2022, https://pirsa.org/22060002 

          @misc{ pirsa_PIRSA:22060002,
            doi = {10.48660/22060002},
            url = {https://pirsa.org/22060002},
            author = {Kunjwal, Ravi},
            keywords = {Quantum Foundations},
            language = {en},
            title = {Quantum nonlocality without entanglement via indefinite causal order},
            publisher = {Perimeter Institute},
            year = {2022},
            month = {jun},
            note = {PIRSA:22060002 see, \url{https://pirsa.org}}
          }

Ravi Kunjwal

Funds for Scientific Research - FNRS

Talk number
PIRSA:22060002
Collection
Talk Type
Subject
Abstract

I will discuss a recent result on an intimate link between two a priori distinct phenomena: quantum nonlocality without entanglement and classically-achievable indefinite causal order. The first phenomenon refers to a multipartite scenario where the parties are unable to perfectly discriminate orthogonal product states drawn from an ensemble of quantum states by using local operations and classical communication (LOCC). The second (hypothetical) phenomenon refers to a multipartite scenario where the parties can communicate classically but the local operations of each party are in the future of the other parties, i.e., they cannot be ordered causally. Specifically, I will show how three separated parties with access to a classical process exhibiting indefinite causal order---the AF/BW process---can perfectly discriminate the states in an ensemble---the SHIFT ensemble---that exhibits quantum nonlocality without entanglement. Time permitting, I will discuss the generalization of this result beyond the tripartite case and comment on its connection with separable operations that are outside LOCC. 

 

Based on joint work with Ämin Baumeler, arXiv:2202.00440.

Zoom Link: https://pitp.zoom.us/j/93727212623?pwd=cjVRL3cvMmhicDRic3lXRFBkNi9xZz09