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  Physics Express 2011, 1: 19
  Research Article
Entanglement of more general two-qubit states
  K. Berradaa,c, H. Eleuchb, Y. Hassounia,c  
a Laboratoire de Physique Théorique URAC 13, Faculté des Sciences, Université Mohammed V-Agdal, Av. Ibn Battouta, B.P. 1014, Agdal Rabat, Morocco
b Institute for Quantum Studies and Department of Physics, Texas A&M University, TX 77843, USA
c The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy

  In this paper, we investigate the degree of entanglement for more general two-qubit states in the construction of spin coherent states. As a measure of entanglement, we use the concurrence and we study its behavior as a function of some new parameters for the case of pure and mixed states. Finally, we study the entanglement of a class of mixed states defined as a statistical mixture of two pure states by using a simplified expression of concurrence in the Wootters measure of entanglement.
  Quantum information; Entanglement; Concurrence; Coherent states  

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