Bell's theorem, its foundations and applications in quantum communication
Entanglement, bell nonlocality, and physical principles for quantum theory
| Full text | |
| Author(s): Show less - |
Ho, Joseph
[1]
;
Moreno, George
[2]
;
Brito, Samurai
[2]
;
Graffitti, Francesco
[1]
;
Morrison, Christopher L.
[1]
;
Nery, Ranieri
[2]
;
Pickston, Alexander
[1]
;
Proietti, Massimiliano
[1]
;
Rabelo, Rafael
[3]
;
Fedrizzi, Alessandro
[1]
;
Chaves, Rafael
[4, 2]
Total Authors: 11
|
| Affiliation: | [1] Heriot Watt Univ, Sch Engn & Phys Sci, Inst Photon & Quantum Sci, Edinburgh EH14 4AS, Midlothian - Scotland
[2] Univ Fed Rio Grande do Norte, Int Inst Phys, BR-59070405 Natal, RN - Brazil
[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas - Brazil
[4] Univ Fed Rio Grande do Norte, Sch Sci & Technol, BR-59078970 Natal, RN - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | NPJ QUANTUM INFORMATION; v. 8, n. 1 FEB 3 2022. |
| Web of Science Citations: | 0 |
| Abstract | |
Efficient distributed computing offers a scalable strategy for solving resource-demanding tasks, such as parallel computation and circuit optimisation. Crucially, the communication overhead introduced by the allotment process should be minimised-a key motivation behind the communication complexity problem (CCP). Quantum resources are well-suited to this task, offering clear strategies that can outperform classical counterparts. Furthermore, the connection between quantum CCPs and non-locality provides an information-theoretic insight into fundamental quantum mechanics. Here we connect quantum CCPs with a generalised non-locality framework-beyond Bell's paradigmatic theorem-by incorporating the underlying causal structure, which governs the distributed task, into a so-called non-local hidden-variable model. We prove that a new class of communication complexity tasks can be associated with Bell-like inequalities, whose violation is both necessary and sufficient for a quantum gain. We experimentally implement a multipartite CCP akin to the guess-your-neighbour-input scenario, and demonstrate a quantum advantage when multipartite Greenberger-Horne-Zeilinger (GHZ) states are shared among three users. (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 |