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Concurrence for a two-qubits mixed state consisting of three pure states in the framework of SU(2) coherent states

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Abstract

A simplified expression of concurrence for two-qubit mixed state having no more than three non-vanishing eigenvalues is obtained. Basing on SU(2) coherent states, the amount of entanglement of two-qubit pure states is studied and conditions for entanglement are calculated by formulating the measure in terms of some new parameters (amplitudes of coherent states). This formalism is generalized to the case of two-qubit mixed states using the simplified expression of concurrence.

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Authors and Affiliations

  1. Department of Physics, University of Kurdistan, P.O. Box 66177-15175, Sanandaj, Iran

    S. Salimi & A. Mohammadzade

  2. Laboratoire de Physique Théorique URAC 13, Faculté des Sciences, Av. Ibn Battouta, B.P. 1014, Agdal, Rabat, Morocco

    K. Berrada

Authors
  1. S. Salimi
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  2. A. Mohammadzade
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  3. K. Berrada
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Correspondence to S. Salimi.

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Salimi, S., Mohammadzade, A. & Berrada, K. Concurrence for a two-qubits mixed state consisting of three pure states in the framework of SU(2) coherent states. Quantum Inf Process 11, 501–518 (2012). https://doi.org/10.1007/s11128-011-0260-z

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  • DOI: https://doi.org/10.1007/s11128-011-0260-z

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