Bounding the Sets of Classical and Quantum Correlations in Networks

Autor(es)

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]}

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Physical Review Letters; v. 123, n. 14 OCT 3 2019.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 18/07258-7 - Emaranhamento, não-localidade de Bell, e princípios físicos para a teoria quântica
• Beneficiário: Rafael Luiz da Silva Rabelo
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores