Phys. Rev. A 66, 042114 (2002) [5 pages]Two qubits of a W state violate Bell’s inequality beyond Cirel’son’s boundSee Also: Erratum Received 30 May 2002; published 22 October 2002 It 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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.66.042114
DOI:
10.1103/PhysRevA.66.042114
PACS:
03.65.Ud, 03.65.Ta
See AlsoErratum: Adán Cabello, Erratum: Two qubits of a W state violate Bell’s inequality beyond Cirel’son’s bound [Phys. Rev. A 66, 042114 (2002)], Phys. Rev. A 67, 029901 (2003). |
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