Genuine Multipartite Nonlocality with Causal-Diagram Postselection
Anno: 2021
Autori: Gebhart V., Pezzè L., Smerzi A.
Affiliazione autori: CNR, INO, QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy; LENS, Largo Enrico Fermi 2, I-50125 Florence, Italy; Univ Napoli Federico II, Via Cinthia 21, I-80126 Naples, Italy.
Abstract: The generation and verification of genuine multipartite nonlocality (GMN) is of central interest for both fundamental research and quantum technological applications, such as quantum privacy. To demonstrate GMN in measurement data, the statistics are commonly postselected by neglecting undesired data. Until now, valid postselection strategies have been restricted to local postselection. A general postselection that is decided after communication between parties can mimic nonlocality, even though the complete data are local. Here, we establish conditions under which GMN is demonstrable even if observations are postselected collectively. Intriguingly, certain postselection strategies that require communication among several parties still offer a demonstration of GMN shared between all parties. The results are derived using the causal structure of the experiment and the no-signaling condition imposed by relativity. Finally, we apply our results to show that genuine three-partite nonlocality can be created with independent particle sources.
Giornale/Rivista: PHYSICAL REVIEW LETTERS
Volume: 127 (14) Da Pagina: 140401-1 A: 140401-6
Maggiori informazioni: This work was supported by the European Commission through the H2020 QuantERA ERA-NET Cofund in Quantum Technologies project “CEBBEC.”Parole chiavi: Bells-inequality; quantum; entanglrment; theoremDOI: 10.1103/PhysRevLett.127.140401Citazioni: 9dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui
