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Quantum Information Processing

, Volume 12, Issue 1, pp 229–236 | Cite as

Relations between entanglement, Bell-inequality violation and teleportation fidelity for the two-qubit X states

  • Ming-Liang Hu
Article

Abstract

Based on the assumption that the receiver Bob can apply any unitary transformation, Horodecki et al. (Phys Lett A 222:21–25, 1996) proved that any mixed two spin-1/2 state which violates the Bell-CHSH inequality is useful for teleportation. Here, we further show that any X state which violates the Bell-CHSH inequality can also be used for nonclassical teleportation even if Bob can only perform the identity or the Pauli rotation operations. Moreover, we showed that the maximal difference between the two average fidelities achievable via Bob’s arbitrary transformations and via the sole identity or the Pauli rotation is 1/9.

Keywords

Entanglement Bell inequality Teleportation 

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.School of ScienceXi’an University of Posts and TelecommunicationsXi’anChina

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