Cabello Quintero, Adán2024-02-272024-02-272002-10Cabello Quintero, A. (2002). Two qubits of a W state violate Bell's inequality beyond Cirel'son's bound. Physical Review A (atomic, molecular, and optical physics and quantum information) [English], 66 (4), 042114-1-042114-5. https://doi.org/10.1103/PhysRevA.66.042114.2469-99262469-9934https://hdl.handle.net/11441/155625It is shown that the correlations between two qubits selected from a trio prepared in a W state violate the Clauser-Horne-Shimony-Holt inequality more than the correlations between two qubits in any quantum state. Such a violation beyond Cirel’son’s bound is smaller than the one achieved by two qubits selected from a trio in a Greenberger-Horne-Zeilinger state [A. Cabello, Phys. Rev. Lett. 88, 060403 (2002)]. However, it has the advantage that all local observers can know from their own measurements whether or not their qubits belong to the selected pair.application/pdf5 p.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/W stateBell's inequalityCirel'son's boundinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1103/PhysRevA.66.042114