| Full text | |
| Author(s): |
Lauand, Pedro
;
Poderini, Davide
;
Nery, Ranieri
;
Moreno, George
;
Pollyceno, Lucas
;
Rabelo, Rafael
;
Chaves, Rafael
Total Authors: 7
|
| Document type: | Journal article |
| Source: | PRX QUANTUM; v. 4, n. 2, p. 18-pg., 2023-04-20. |
| Abstract | |
Seen from the modern lens of causal inference, Bell's theorem is nothing other than the proof that a specific classical causal model cannot explain quantum correlations. It is thus natural to move beyond Bell's paradigmatic scenario and consider different causal structures. For the specific case of three observ-able variables, it is known that there are three nontrivial causal networks. Two of those are known to give rise to quantum nonclassicality: the instrumental and the triangle scenarios. Here we analyze the third and remaining one, which we name the Evans scenario, akin to the causal structure underlying the entanglement-swapping experiment. We prove a number of results about this elusive scenario and introduce new and efficient computational tools for its analysis that can also be adapted to deal with more general causal structures. We do not solve its main open problem-whether quantum nonclassical correlations can arise from it-but give a significant step in this direction by proving that postquantum correlations, analogous to the paradigmatic Popescu-Rohrlich box, do violate the constraints imposed by a classical description of the Evans causal structure. (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 |
| FAPESP's process: | 22/03792-4 - Bell nonlocality on quantum networks |
| Grantee: | Pedro Nóbrega Lauand |
| Support Opportunities: | Scholarships in Brazil - Master |