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

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

2010-05-12

arxiv.org/abs/1005.2083v2

Quantum Inf Process 11(2012) 501-518

Physics

Quantum Physics

17 page, 1 figure

Scientific paper

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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