4.6 Article

Experimental Genuine Tripartite Nonlocality in a Quantum Triangle Network

Journal

PRX QUANTUM
Volume 3, Issue 3, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PRXQuantum.3.030342

Keywords

-

Funding

  1. John Templeton Foundation via The Quantum Information Structure of Spacetime (QISS) Project [61466]
  2. Ministry of Education, University, and Research (MIUR) [2017SRNBRK]
  3. Regione Lazio program Progetti di Gruppi di ricerca via Lazio Innova S.p.A. [13/2008, 85-2017-15200]
  4. European Research Council (ERC) [884676]
  5. Serrapilheira Institute [Serra-1708-15763]
  6. Government of Canada through the Department of Innovation, Science and Economic Development
  7. Province of Ontario through the Ministry of Colleges and Universities
  8. Brazilian National Council for Scientific and Technological Development (CNPq) via the National Institute for Science Technology on Quantum Information (INCT-IQ) [406574/2018-9, 307295/2020-6]
  9. Ministry of Technology, Innovations, and Communication (MCTIC)
  10. Ministry of Education (MEC)
  11. European Research Council (ERC) [884676] Funding Source: European Research Council (ERC)

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Quantum networks play a vital role in quantum science, leading to discoveries in quantum theory and enabling innovative communication and cryptography protocols. This article verifies the nonlocality of an experimental triangle network composed of three independent sources of entangled photons.
Quantum networks are the center of many of the recent advances in quantum science, not only lead-ing to the discovery of new properties in the foundations of quantum theory but also allowing for novel communication and cryptography protocols. It is known that networks beyond that in the paradigmatic Bell's theorem imply new and sometimes stronger forms of nonclassicality. Due to a number of prac-tical difficulties, however, the experimental implementation of such networks remains far less explored. Going beyond what has been previously tested, here we verify the nonlocality of an experimental trian-gle network, consisting of three independent sources of bipartite entangled photon states interconnecting three distant parties. By performing separable measurements only and evaluating parallel chained Bell inequalities, we show that such networks can lead to a genuine form of tripartite nonlocality, where clas-sical models are unable to mimic the quantum predictions even if some of the parties are allowed to communicate.

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