Violating bell's inequality beyond Cirel'son's bound
Cirel’son inequality states that the absolute value of the combination of quantum correlations appearing in the Clauser-Horne-Shimony-Holt (CHSH) inequality is bound by 2 √ 2. It is shown that the correlations of two qubits belonging to a three-qubit system can violate the CHSH inequality beyond 2 √...
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2002 |
| País: | España |
| Institución: | Universidad de Sevilla (US) |
| Repositorio: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/153351 |
| Acceso en línea: | https://hdl.handle.net/11441/153351 https://doi.org/10.1103/PhysRevLett.88.060403 |
| Access Level: | acceso abierto |
| Palabra clave: | Cirel’son inequality Clauser-Horne-Shimony-Holt (CHSH) inequality Bell's inequality |
| Sumario: | Cirel’son inequality states that the absolute value of the combination of quantum correlations appearing in the Clauser-Horne-Shimony-Holt (CHSH) inequality is bound by 2 √ 2. It is shown that the correlations of two qubits belonging to a three-qubit system can violate the CHSH inequality beyond 2 √ 2. Such a violation is not in conflict with Cirel’son’s inequality because it is based on postselected systems. The maximum allowed violation of the CHSH inequality, 4, can be achieved using a Greenberger-Horne-Zeilinger state. |
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