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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Bounding the Sets of Classical and Quantum Correlations in Networks

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Author(s):
Pozas-Kerstjens, Alejandro [1] ; Rabelo, Rafael [2] ; Rudnicki, Lukasz [3, 4, 5] ; Chaves, Rafael [6, 7] ; Cavalcanti, Daniel [1] ; Navascues, Miguel [8] ; Acin, Antonio [9, 1]
Total Authors: 7
Affiliation:
[1] Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, Castelldefels 08860, Barcelona - Spain
[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
[3] Univ Gdansk, ICTQT, PL-80308 Gdansk - Poland
[4] Max Planck Inst Phys Lichts, Staudtstr 2, D-91058 Erlangen - Germany
[5] Polish Acad Sci, Ctr Theoret Phys, Aleja Lotnikow 32-46, PL-02668 Warsaw - Poland
[6] Univ Fed Rio Grande do Norte, Sch Sci & Technol, BR-59078970 Natal, RN - Brazil
[7] Univ Fed Rio Grande do Norte, Int Inst Phys, Campus Univ, BR-59078970 Natal, RN - Brazil
[8] Austrian Acad Sci, Inst Quantum Opt & Quantum Informat IQOQI Vienna, Boltzmanngasse 3, A-1090 Vienna - Austria
[9] ICREA, Pg Lluis Companys 23, Barcelona 08010 - Spain
Total Affiliations: 9
Document type: Journal article
Source: Physical Review Letters; v. 123, n. 14 OCT 3 2019.
Web of Science Citations: 0
Abstract

We present a method that allows the study of classical and quantum correlations in networks with causally independent parties, such as the scenario underlying entanglement swapping. By imposing relaxations of factorization constraints in a form compatible with semidefinite programing, it enables the use of the Navascues-Pironio-Acin hierarchy in complex quantum networks. We first show how the technique successfully identifies correlations not attainable in the entanglement-swapping scenario. Then we use it to show how the nonlocal power of measurements can be activated in a network: there exist measuring devices that, despite being unable to generate nonlocal correlations in the standard Bell scenario, provide a classical-quantum separation in an entanglement swapping configuration. (AU)

FAPESP's process: 18/07258-7 - Entanglement, bell nonlocality, and physical principles for quantum theory
Grantee:Rafael Luiz da Silva Rabelo
Support Opportunities: Research Grants - Young Investigators Grants