A COMPARATIVE STUDY OF NEGATIVITY AND CONCURRENCE BASED ON SPIN COHERENT STATES

K. Berrada (), M. El Baz (), Hichem Eleuch and Y. Hassouni ()
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K. Berrada: Laboratoire de Physique Théorique, Faculté des Sciences, Université Mohammed V-Agdal, Av. Ibn Battouta, B. P. 1014, Agdal Rabat, Morocco
M. El Baz: Laboratoire de Physique Théorique, Faculté des Sciences, Université Mohammed V-Agdal, Av. Ibn Battouta, B. P. 1014, Agdal Rabat, Morocco
Y. Hassouni: Laboratoire de Physique Théorique, Faculté des Sciences, Université Mohammed V-Agdal, Av. Ibn Battouta, B. P. 1014, Agdal Rabat, Morocco

International Journal of Modern Physics C (IJMPC), 2010, vol. 21, issue 03, 291-305

Abstract: In this paper, we investigate two different entanglement measures, the negativity and concurrence, in the case of pure and mixed states of two-qubit system basing on the spin coherent states. For two-qubit pure states, the negativity is the same as the concurrence. For mixed states, using a simplified expression of concurrence in Wootters' measure of entanglement, we write the bounds of Verstraeteet al.1as a function of some new parameters and we compare the both measures for a class of mixed states.

Keywords: Quantum information; entanglement measures; spin coherent state; 03.67.Mn; 03.65.Ud; 03.67.-a (search for similar items in EconPapers)
Date: 2010
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DOI: 10.1142/S0129183110015129

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