Bell nonlocality on quantum networks

• Grant number: 22/03792-4
• Support Opportunities: Scholarships in Brazil - Master
• Start date: September 01, 2022
• End date: May 31, 2024
• Field of knowledge: Physical Sciences and Mathematics - Physics
• Principal Investigator: Rafael Luiz da Silva Rabelo
• Grantee: Pedro Nóbrega Lauand
• Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated research grant: 18/07258-7 - Entanglement, Bell nonlocality, and physical principles for quantum theory, AP.JP
• Associated scholarship(s): 23/02575-2 - Quantum advantage for communication tasks in networks, BE.EP.MS

Abstract

Bell's theorem -- one of the most important results of the foundations of quantum theory and philosophy of science -- states that quantum theory is inconsistent with physical models that obey the local causality hypothesis. Originally, nonlocal aspects of quantum theory were investigated in the seminal scenario proposed in 1935 by Einstein, Podolski, and Rosen, and in direct generalizations of the same scenario, in which a composite system is prepared in a given state and each of its components is sent to a given party to be measured. Recently, though, investigation on nonlocality began to consider more sophisticated experiments that involve more composite systems independently prepared and sent to different parties, establishing, thus, a quantum network.Despite being simple prototypes of a future quantum internet, these novel scenarios give us new perspectives on Bell's theorem and the theory of nonlocality, leading to new conceptual and practical challenges. In this project, we will investigate simple quantum networks with the main goal of identifying nonlocal quantum correlations, that do not admit classical description compatible with the network. Specific goals are: (i) to obtain new Bell inequalities that witness nonclassicality in network scenarios, and (ii) to evaluate how numerical methods, e.g., nonconvex optimization, can be useful for certification of quantum advantage in several network scenarios.

Scientific publications

(4)

(The scientific publications listed on this page originate from the Web of Science or SciELO databases. Their authors have cited FAPESP grant or fellowship project numbers awarded to Principal Investigators or Fellowship Recipients, whether or not they are among the authors. This information is collected automatically and retrieved directly from those bibliometric databases.)

LAUAND, PEDRO; PODERINI, DAVIDE; NERY, RANIERI; MORENO, GEORGE; POLLYCENO, LUCAS; RABELO, RAFAEL; CHAVES, RAFAEL. Witnessing Nonclassicality in a Causal Structure with Three Observable Variables. PRX QUANTUM, v. 4, n. 2, p. 18-pg., 2023-04-20. (18/07258-7, 22/03792-4)

CAMILLO, GIULIO; LAUAND, PEDRO; PODERINI, DAVIDE; RABELO, RAFAEL; CHAVES, RAFAEL. Estimating the volume of correlation sets in causal networks. PHYSICAL REVIEW A, v. 109, n. 1, p. 12-pg., 2024-01-24. (22/03792-4, 18/07258-7)

PODERINI, DAVIDE; NERY, RANIERI; MORENO, GEORGE; ZAMORA, SANTIAGO; LAUAND, PEDRO; CHAVES, RAFAEL. Observational-interventional Bell inequalities. PHYSICAL REVIEW A, v. 110, n. 4, p. 14-pg., 2024-10-21. (22/03792-4)

LAUAND, PEDRO; PODERINI, DAVIDE; RABELO, RAFAEL; CHAVES, RAFAEL. Minimal Example of Quantum Nonclassicality without Freedom of Choice. Physical Review Letters, v. 135, n. 9, p. 6-pg., 2025-08-26. (22/03792-4)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

LAUAND, Pedro Nóbrega. Não-classicalidade de Bell em redes: limitando o conjunto de correlações clássicas. 2025. Master's Dissertation - Universidade Estadual de Campinas (UNICAMP). Instituto de Física Gleb Wataghin Campinas, SP.